October 2024 - Linux-stable-mirror

FAILED: patch "[PATCH] serial: qcom-geni: fix console corruption" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x cc4a0e5754a16bbc1e215c091349a7c83a2c5e14 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100137-jockey-undergo-9125@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: cc4a0e5754a1 ("serial: qcom-geni: fix console corruption") f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 947cc4ecc06c ("serial: qcom-geni: fix soft lockup on sw flow control and suspend") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From cc4a0e5754a16bbc1e215c091349a7c83a2c5e14 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:34 +0200 Subject: [PATCH] serial: qcom-geni: fix console corruption MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Qualcomm serial console implementation is broken and can lose characters when the serial port is also used for tty output. Specifically, the console code only waits for the current tx command to complete when all data has already been written to the fifo. When there are on-going longer transfers this often means that console output is lost when the console code inadvertently "hijacks" the current tx command instead of starting a new one. This can, for example, be observed during boot when console output that should have been interspersed with init output is truncated: [ 9.462317] qcom-snps-eusb2-hsphy fde000.phy: Registered Qcom-eUSB2 phy [ OK ] Found device KBG50ZNS256G KIOXIA Wi[ 9.471743ndows. [ 9.539915] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller Add a new state variable to track how much data has been written to the fifo and use it to determine when the fifo and shift register are both empty. This is needed since there is currently no other known way to determine when the shift register is empty. This in turn allows the console code to interrupt long transfers without losing data. Note that the oops-in-progress case is similarly broken as it does not cancel any active command and also waits for the wrong status flag when attempting to drain the fifo (TX_FIFO_NOT_EMPTY_EN is only set when cancelling a command leaves data in the fifo). Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: a1fee899e5be ("tty: serial: qcom_geni_serial: Fix softlock") Fixes: 9e957a155005 ("serial: qcom-geni: Don't cancel/abort if we can't get the port lock") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-7-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 7bbd70c30620..f8f6e9466b40 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -131,6 +131,7 @@ struct qcom_geni_serial_port { bool brk; unsigned int tx_remaining; + unsigned int tx_queued; int wakeup_irq; bool rx_tx_swap; bool cts_rts_swap; @@ -144,6 +145,8 @@ static const struct uart_ops qcom_geni_uart_pops; static struct uart_driver qcom_geni_console_driver; static struct uart_driver qcom_geni_uart_driver; +static void qcom_geni_serial_cancel_tx_cmd(struct uart_port *uport); + static inline struct qcom_geni_serial_port *to_dev_port(struct uart_port *uport) { return container_of(uport, struct qcom_geni_serial_port, uport); @@ -393,6 +396,14 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, #endif #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE +static void qcom_geni_serial_drain_fifo(struct uart_port *uport) +{ + struct qcom_geni_serial_port *port = to_dev_port(uport); + + qcom_geni_serial_poll_bitfield(uport, SE_GENI_M_GP_LENGTH, GP_LENGTH, + port->tx_queued); +} + static void qcom_geni_serial_wr_char(struct uart_port *uport, unsigned char ch) { struct qcom_geni_private_data *private_data = uport->private_data; @@ -468,7 +479,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, struct qcom_geni_serial_port *port; bool locked = true; unsigned long flags; - u32 geni_status; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -482,34 +492,20 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, else uart_port_lock_irqsave(uport, &flags); - geni_status = readl(uport->membase + SE_GENI_STATUS); + if (qcom_geni_serial_main_active(uport)) { + /* Wait for completion or drain FIFO */ + if (!locked || port->tx_remaining == 0) + qcom_geni_serial_poll_tx_done(uport); + else + qcom_geni_serial_drain_fifo(uport); - if (!locked) { - /* - * We can only get here if an oops is in progress then we were - * unable to get the lock. This means we can't safely access - * our state variables like tx_remaining. About the best we - * can do is wait for the FIFO to be empty before we start our - * transfer, so we'll do that. - */ - qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, - M_TX_FIFO_NOT_EMPTY_EN, false); - } else if ((geni_status & M_GENI_CMD_ACTIVE) && !port->tx_remaining) { - /* - * It seems we can't interrupt existing transfers if all data - * has been sent, in which case we need to look for done first. - */ - qcom_geni_serial_poll_tx_done(uport); + qcom_geni_serial_cancel_tx_cmd(uport); } __qcom_geni_serial_console_write(uport, s, count); - - if (locked) { - if (port->tx_remaining) - qcom_geni_serial_setup_tx(uport, port->tx_remaining); + if (locked) uart_port_unlock_irqrestore(uport, flags); - } } static void handle_rx_console(struct uart_port *uport, u32 bytes, bool drop) @@ -690,6 +686,7 @@ static void qcom_geni_serial_cancel_tx_cmd(struct uart_port *uport) writel(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); port->tx_remaining = 0; + port->tx_queued = 0; } static void qcom_geni_serial_handle_rx_fifo(struct uart_port *uport, bool drop) @@ -916,6 +913,7 @@ static void qcom_geni_serial_handle_tx_fifo(struct uart_port *uport, if (!port->tx_remaining) { qcom_geni_serial_setup_tx(uport, pending); port->tx_remaining = pending; + port->tx_queued = 0; irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); if (!(irq_en & M_TX_FIFO_WATERMARK_EN)) @@ -924,6 +922,7 @@ static void qcom_geni_serial_handle_tx_fifo(struct uart_port *uport, } qcom_geni_serial_send_chunk_fifo(uport, chunk); + port->tx_queued += chunk; /* * The tx fifo watermark is level triggered and latched. Though we had

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FAILED: patch "[PATCH] serial: qcom-geni: fix false console tx restart" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100118-deodorize-treble-799b@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^.. Possible dependencies: f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:30 +0200 Subject: [PATCH] serial: qcom-geni: fix false console tx restart MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") addressed an issue with stalled tx after the console code interrupted the last bytes of a tx command by reenabling the watermark interrupt if there is data in write buffer. This can however break software flow control by re-enabling tx after the user has stopped it. Address the original issue by not clearing the CMD_DONE flag after polling for command completion. This allows the interrupt handler to start another transfer when the CMD_DONE interrupt has not been disabled due to flow control. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 309c0bddf26a..b88435c0ea50 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) { int done; - u32 irq_clear = M_CMD_DONE_EN; done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_DONE_EN, true); if (!done) { writel(M_GENI_CMD_ABORT, uport->membase + SE_GENI_M_CMD_CTRL_REG); - irq_clear |= M_CMD_ABORT_EN; qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_ABORT_EN, true); + writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } - writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); } static void qcom_geni_serial_abort_rx(struct uart_port *uport) @@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, unsigned char c) { writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, 1); WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_TX_FIFO_WATERMARK_EN, true)); @@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, } writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, bytes_to_send); for (i = 0; i < count; ) { size_t chars_to_write = 0; @@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, bool locked = true; unsigned long flags; u32 geni_status; - u32 irq_en; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, * has been sent, in which case we need to look for done first. */ qcom_geni_serial_poll_tx_done(uport); - - if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { - irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); - writel(irq_en | M_TX_FIFO_WATERMARK_EN, - uport->membase + SE_GENI_M_IRQ_EN); - } } __qcom_geni_serial_console_write(uport, s, count);

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FAILED: patch "[PATCH] serial: qcom-geni: fix false console tx restart" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100117-bundle-qualified-91c8@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^.. Possible dependencies: f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:30 +0200 Subject: [PATCH] serial: qcom-geni: fix false console tx restart MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") addressed an issue with stalled tx after the console code interrupted the last bytes of a tx command by reenabling the watermark interrupt if there is data in write buffer. This can however break software flow control by re-enabling tx after the user has stopped it. Address the original issue by not clearing the CMD_DONE flag after polling for command completion. This allows the interrupt handler to start another transfer when the CMD_DONE interrupt has not been disabled due to flow control. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 309c0bddf26a..b88435c0ea50 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) { int done; - u32 irq_clear = M_CMD_DONE_EN; done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_DONE_EN, true); if (!done) { writel(M_GENI_CMD_ABORT, uport->membase + SE_GENI_M_CMD_CTRL_REG); - irq_clear |= M_CMD_ABORT_EN; qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_ABORT_EN, true); + writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } - writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); } static void qcom_geni_serial_abort_rx(struct uart_port *uport) @@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, unsigned char c) { writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, 1); WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_TX_FIFO_WATERMARK_EN, true)); @@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, } writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, bytes_to_send); for (i = 0; i < count; ) { size_t chars_to_write = 0; @@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, bool locked = true; unsigned long flags; u32 geni_status; - u32 irq_en; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, * has been sent, in which case we need to look for done first. */ qcom_geni_serial_poll_tx_done(uport); - - if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { - irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); - writel(irq_en | M_TX_FIFO_WATERMARK_EN, - uport->membase + SE_GENI_M_IRQ_EN); - } } __qcom_geni_serial_console_write(uport, s, count);

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FAILED: patch "[PATCH] serial: qcom-geni: fix false console tx restart" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100116-upriver-dispersed-2277@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:30 +0200 Subject: [PATCH] serial: qcom-geni: fix false console tx restart MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") addressed an issue with stalled tx after the console code interrupted the last bytes of a tx command by reenabling the watermark interrupt if there is data in write buffer. This can however break software flow control by re-enabling tx after the user has stopped it. Address the original issue by not clearing the CMD_DONE flag after polling for command completion. This allows the interrupt handler to start another transfer when the CMD_DONE interrupt has not been disabled due to flow control. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 309c0bddf26a..b88435c0ea50 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) { int done; - u32 irq_clear = M_CMD_DONE_EN; done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_DONE_EN, true); if (!done) { writel(M_GENI_CMD_ABORT, uport->membase + SE_GENI_M_CMD_CTRL_REG); - irq_clear |= M_CMD_ABORT_EN; qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_ABORT_EN, true); + writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } - writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); } static void qcom_geni_serial_abort_rx(struct uart_port *uport) @@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, unsigned char c) { writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, 1); WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_TX_FIFO_WATERMARK_EN, true)); @@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, } writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, bytes_to_send); for (i = 0; i < count; ) { size_t chars_to_write = 0; @@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, bool locked = true; unsigned long flags; u32 geni_status; - u32 irq_en; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, * has been sent, in which case we need to look for done first. */ qcom_geni_serial_poll_tx_done(uport); - - if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { - irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); - writel(irq_en | M_TX_FIFO_WATERMARK_EN, - uport->membase + SE_GENI_M_IRQ_EN); - } } __qcom_geni_serial_console_write(uport, s, count);

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FAILED: patch "[PATCH] serial: qcom-geni: fix false console tx restart" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100116-prowess-happily-84bd@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:30 +0200 Subject: [PATCH] serial: qcom-geni: fix false console tx restart MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") addressed an issue with stalled tx after the console code interrupted the last bytes of a tx command by reenabling the watermark interrupt if there is data in write buffer. This can however break software flow control by re-enabling tx after the user has stopped it. Address the original issue by not clearing the CMD_DONE flag after polling for command completion. This allows the interrupt handler to start another transfer when the CMD_DONE interrupt has not been disabled due to flow control. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 309c0bddf26a..b88435c0ea50 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) { int done; - u32 irq_clear = M_CMD_DONE_EN; done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_DONE_EN, true); if (!done) { writel(M_GENI_CMD_ABORT, uport->membase + SE_GENI_M_CMD_CTRL_REG); - irq_clear |= M_CMD_ABORT_EN; qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_ABORT_EN, true); + writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } - writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); } static void qcom_geni_serial_abort_rx(struct uart_port *uport) @@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, unsigned char c) { writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, 1); WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_TX_FIFO_WATERMARK_EN, true)); @@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, } writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, bytes_to_send); for (i = 0; i < count; ) { size_t chars_to_write = 0; @@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, bool locked = true; unsigned long flags; u32 geni_status; - u32 irq_en; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, * has been sent, in which case we need to look for done first. */ qcom_geni_serial_poll_tx_done(uport); - - if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { - irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); - writel(irq_en | M_TX_FIFO_WATERMARK_EN, - uport->membase + SE_GENI_M_IRQ_EN); - } } __qcom_geni_serial_console_write(uport, s, count);

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FAILED: patch "[PATCH] serial: qcom-geni: fix false console tx restart" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100115-gorged-snare-6a95@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:30 +0200 Subject: [PATCH] serial: qcom-geni: fix false console tx restart MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") addressed an issue with stalled tx after the console code interrupted the last bytes of a tx command by reenabling the watermark interrupt if there is data in write buffer. This can however break software flow control by re-enabling tx after the user has stopped it. Address the original issue by not clearing the CMD_DONE flag after polling for command completion. This allows the interrupt handler to start another transfer when the CMD_DONE interrupt has not been disabled due to flow control. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 309c0bddf26a..b88435c0ea50 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) { int done; - u32 irq_clear = M_CMD_DONE_EN; done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_DONE_EN, true); if (!done) { writel(M_GENI_CMD_ABORT, uport->membase + SE_GENI_M_CMD_CTRL_REG); - irq_clear |= M_CMD_ABORT_EN; qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_ABORT_EN, true); + writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } - writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); } static void qcom_geni_serial_abort_rx(struct uart_port *uport) @@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, unsigned char c) { writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, 1); WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_TX_FIFO_WATERMARK_EN, true)); @@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, } writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, bytes_to_send); for (i = 0; i < count; ) { size_t chars_to_write = 0; @@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, bool locked = true; unsigned long flags; u32 geni_status; - u32 irq_en; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, * has been sent, in which case we need to look for done first. */ qcom_geni_serial_poll_tx_done(uport); - - if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { - irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); - writel(irq_en | M_TX_FIFO_WATERMARK_EN, - uport->membase + SE_GENI_M_IRQ_EN); - } } __qcom_geni_serial_console_write(uport, s, count);

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FAILED: patch "[PATCH] serial: qcom-geni: fix false console tx restart" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100114-ample-drowsily-e38d@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: f97cdbbf187f ("serial: qcom-geni: fix false console tx restart") 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") f8fef2fa419f ("tty: msm_serial: use dmaengine_prep_slave_sg()") 9054605ab846 ("tty: 8250_omap: use dmaengine_prep_slave_sg()") 8192fabb0db2 ("tty: 8250_dma: use dmaengine_prep_slave_sg()") 3bcb0bf65c2b ("Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From f97cdbbf187fefcf1fe19689cd9fdca11fe9c3eb Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:30 +0200 Subject: [PATCH] serial: qcom-geni: fix false console tx restart MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") addressed an issue with stalled tx after the console code interrupted the last bytes of a tx command by reenabling the watermark interrupt if there is data in write buffer. This can however break software flow control by re-enabling tx after the user has stopped it. Address the original issue by not clearing the CMD_DONE flag after polling for command completion. This allows the interrupt handler to start another transfer when the CMD_DONE interrupt has not been disabled due to flow control. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang") Cc: stable(a)vger.kernel.org # 4.17 Reviewed-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 309c0bddf26a..b88435c0ea50 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size) static void qcom_geni_serial_poll_tx_done(struct uart_port *uport) { int done; - u32 irq_clear = M_CMD_DONE_EN; done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_DONE_EN, true); if (!done) { writel(M_GENI_CMD_ABORT, uport->membase + SE_GENI_M_CMD_CTRL_REG); - irq_clear |= M_CMD_ABORT_EN; qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_CMD_ABORT_EN, true); + writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); } - writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR); } static void qcom_geni_serial_abort_rx(struct uart_port *uport) @@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport, unsigned char c) { writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, 1); WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS, M_TX_FIFO_WATERMARK_EN, true)); @@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s, } writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG); + writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR); qcom_geni_serial_setup_tx(uport, bytes_to_send); for (i = 0; i < count; ) { size_t chars_to_write = 0; @@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, bool locked = true; unsigned long flags; u32 geni_status; - u32 irq_en; WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS); @@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s, * has been sent, in which case we need to look for done first. */ qcom_geni_serial_poll_tx_done(uport); - - if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) { - irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN); - writel(irq_en | M_TX_FIFO_WATERMARK_EN, - uport->membase + SE_GENI_M_IRQ_EN); - } } __qcom_geni_serial_console_write(uport, s, count);

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FAILED: patch "[PATCH] serial: qcom-geni: fix fifo polling timeout" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x c80ee36ac8f9e9c27d8e097a2eaaf198e7534c83 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100158-stoke-upfront-79a9@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^.. Possible dependencies: c80ee36ac8f9 ("serial: qcom-geni: fix fifo polling timeout") 8ece7b754bc3 ("serial: qcom-geni: fix opp vote on shutdown") 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA") 40ec6d41c841 ("tty: serial: qcom-geni-serial: use of_device_id data") 0626afe57b1f ("tty: serial: qcom-geni-serial: drop the return value from handle_rx") bd7955840cbe ("tty: serial: qcom-geni-serial: refactor qcom_geni_serial_send_chunk_fifo()") d420fb491cbc ("tty: serial: qcom-geni-serial: split out the FIFO tx code") fe6a00e8fcbe ("tty: serial: qcom-geni-serial: refactor qcom_geni_serial_isr()") 00ce7c6e86b5 ("tty: serial: qcom-geni-serial: improve the to_dev_port() macro") 6cde11dbf4b6 ("tty: serial: qcom-geni-serial: align #define values") 68c6bd92c86c ("tty: serial: qcom-geni-serial: remove unused symbols") d0fabb0dc1a6 ("tty: serial: qcom-geni-serial: drop unneeded forward definitions") 35781d8356a2 ("tty: serial: qcom-geni-serial: Add support for Hibernation feature") 654a8d6c93e7 ("tty: serial: qcom-geni-serial: Implement start_rx callback") c2194bc999d4 ("tty: serial: qcom-geni-serial: Remove uart frequency table. Instead, find suitable frequency with call to clk_round_rate.") d6efb3ac3e6c ("Merge tag 'tty-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From c80ee36ac8f9e9c27d8e097a2eaaf198e7534c83 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:29 +0200 Subject: [PATCH] serial: qcom-geni: fix fifo polling timeout MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The qcom_geni_serial_poll_bit() can be used to wait for events like command completion and is supposed to wait for the time it takes to clear a full fifo before timing out. As noted by Doug, the current implementation does not account for start, stop and parity bits when determining the timeout. The helper also does not currently account for the shift register and the two-word intermediate transfer register. A too short timeout can specifically lead to lost characters when waiting for a transfer to complete as the transfer is cancelled on timeout. Instead of determining the poll timeout on every call, store the fifo timeout when updating it in set_termios() and make sure to take the shift and intermediate registers into account. Note that serial core has already added a 20 ms margin to the fifo timeout. Also note that the current uart_fifo_timeout() interface does unnecessary calculations on every call and did not exist in earlier kernels so only store its result once. This facilitates backports too as earlier kernels can derive the timeout from uport->timeout, which has since been removed. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Cc: stable(a)vger.kernel.org # 4.17 Reported-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-2-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 69a632fefc41..309c0bddf26a 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -124,7 +124,7 @@ struct qcom_geni_serial_port { dma_addr_t tx_dma_addr; dma_addr_t rx_dma_addr; bool setup; - unsigned int baud; + unsigned long poll_timeout_us; unsigned long clk_rate; void *rx_buf; u32 loopback; @@ -270,22 +270,13 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport, { u32 reg; struct qcom_geni_serial_port *port; - unsigned int baud; - unsigned int fifo_bits; unsigned long timeout_us = 20000; struct qcom_geni_private_data *private_data = uport->private_data; if (private_data->drv) { port = to_dev_port(uport); - baud = port->baud; - if (!baud) - baud = 115200; - fifo_bits = port->tx_fifo_depth * port->tx_fifo_width; - /* - * Total polling iterations based on FIFO worth of bytes to be - * sent at current baud. Add a little fluff to the wait. - */ - timeout_us = ((fifo_bits * USEC_PER_SEC) / baud) + 500; + if (port->poll_timeout_us) + timeout_us = port->poll_timeout_us; } /* @@ -1244,11 +1235,11 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, unsigned long clk_rate; u32 ver, sampling_rate; unsigned int avg_bw_core; + unsigned long timeout; qcom_geni_serial_stop_rx(uport); /* baud rate */ baud = uart_get_baud_rate(uport, termios, old, 300, 4000000); - port->baud = baud; sampling_rate = UART_OVERSAMPLING; /* Sampling rate is halved for IP versions >= 2.5 */ @@ -1326,9 +1317,21 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, else tx_trans_cfg |= UART_CTS_MASK; - if (baud) + if (baud) { uart_update_timeout(uport, termios->c_cflag, baud); + /* + * Make sure that qcom_geni_serial_poll_bitfield() waits for + * the FIFO, two-word intermediate transfer register and shift + * register to clear. + * + * Note that uart_fifo_timeout() also adds a 20 ms margin. + */ + timeout = jiffies_to_usecs(uart_fifo_timeout(uport)); + timeout += 3 * timeout / port->tx_fifo_depth; + WRITE_ONCE(port->poll_timeout_us, timeout); + } + if (!uart_console(uport)) writel(port->loopback, uport->membase + SE_UART_LOOPBACK_CFG);

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FAILED: patch "[PATCH] serial: qcom-geni: fix fifo polling timeout" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x c80ee36ac8f9e9c27d8e097a2eaaf198e7534c83 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100157-playhouse-snipping-6cd2@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^.. Possible dependencies: c80ee36ac8f9 ("serial: qcom-geni: fix fifo polling timeout") 8ece7b754bc3 ("serial: qcom-geni: fix opp vote on shutdown") 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA") 40ec6d41c841 ("tty: serial: qcom-geni-serial: use of_device_id data") 0626afe57b1f ("tty: serial: qcom-geni-serial: drop the return value from handle_rx") bd7955840cbe ("tty: serial: qcom-geni-serial: refactor qcom_geni_serial_send_chunk_fifo()") d420fb491cbc ("tty: serial: qcom-geni-serial: split out the FIFO tx code") fe6a00e8fcbe ("tty: serial: qcom-geni-serial: refactor qcom_geni_serial_isr()") 00ce7c6e86b5 ("tty: serial: qcom-geni-serial: improve the to_dev_port() macro") 6cde11dbf4b6 ("tty: serial: qcom-geni-serial: align #define values") 68c6bd92c86c ("tty: serial: qcom-geni-serial: remove unused symbols") d0fabb0dc1a6 ("tty: serial: qcom-geni-serial: drop unneeded forward definitions") 35781d8356a2 ("tty: serial: qcom-geni-serial: Add support for Hibernation feature") 654a8d6c93e7 ("tty: serial: qcom-geni-serial: Implement start_rx callback") c2194bc999d4 ("tty: serial: qcom-geni-serial: Remove uart frequency table. Instead, find suitable frequency with call to clk_round_rate.") d6efb3ac3e6c ("Merge tag 'tty-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From c80ee36ac8f9e9c27d8e097a2eaaf198e7534c83 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:29 +0200 Subject: [PATCH] serial: qcom-geni: fix fifo polling timeout MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The qcom_geni_serial_poll_bit() can be used to wait for events like command completion and is supposed to wait for the time it takes to clear a full fifo before timing out. As noted by Doug, the current implementation does not account for start, stop and parity bits when determining the timeout. The helper also does not currently account for the shift register and the two-word intermediate transfer register. A too short timeout can specifically lead to lost characters when waiting for a transfer to complete as the transfer is cancelled on timeout. Instead of determining the poll timeout on every call, store the fifo timeout when updating it in set_termios() and make sure to take the shift and intermediate registers into account. Note that serial core has already added a 20 ms margin to the fifo timeout. Also note that the current uart_fifo_timeout() interface does unnecessary calculations on every call and did not exist in earlier kernels so only store its result once. This facilitates backports too as earlier kernels can derive the timeout from uport->timeout, which has since been removed. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Cc: stable(a)vger.kernel.org # 4.17 Reported-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-2-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 69a632fefc41..309c0bddf26a 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -124,7 +124,7 @@ struct qcom_geni_serial_port { dma_addr_t tx_dma_addr; dma_addr_t rx_dma_addr; bool setup; - unsigned int baud; + unsigned long poll_timeout_us; unsigned long clk_rate; void *rx_buf; u32 loopback; @@ -270,22 +270,13 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport, { u32 reg; struct qcom_geni_serial_port *port; - unsigned int baud; - unsigned int fifo_bits; unsigned long timeout_us = 20000; struct qcom_geni_private_data *private_data = uport->private_data; if (private_data->drv) { port = to_dev_port(uport); - baud = port->baud; - if (!baud) - baud = 115200; - fifo_bits = port->tx_fifo_depth * port->tx_fifo_width; - /* - * Total polling iterations based on FIFO worth of bytes to be - * sent at current baud. Add a little fluff to the wait. - */ - timeout_us = ((fifo_bits * USEC_PER_SEC) / baud) + 500; + if (port->poll_timeout_us) + timeout_us = port->poll_timeout_us; } /* @@ -1244,11 +1235,11 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, unsigned long clk_rate; u32 ver, sampling_rate; unsigned int avg_bw_core; + unsigned long timeout; qcom_geni_serial_stop_rx(uport); /* baud rate */ baud = uart_get_baud_rate(uport, termios, old, 300, 4000000); - port->baud = baud; sampling_rate = UART_OVERSAMPLING; /* Sampling rate is halved for IP versions >= 2.5 */ @@ -1326,9 +1317,21 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, else tx_trans_cfg |= UART_CTS_MASK; - if (baud) + if (baud) { uart_update_timeout(uport, termios->c_cflag, baud); + /* + * Make sure that qcom_geni_serial_poll_bitfield() waits for + * the FIFO, two-word intermediate transfer register and shift + * register to clear. + * + * Note that uart_fifo_timeout() also adds a 20 ms margin. + */ + timeout = jiffies_to_usecs(uart_fifo_timeout(uport)); + timeout += 3 * timeout / port->tx_fifo_depth; + WRITE_ONCE(port->poll_timeout_us, timeout); + } + if (!uart_console(uport)) writel(port->loopback, uport->membase + SE_UART_LOOPBACK_CFG);

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FAILED: patch "[PATCH] serial: qcom-geni: fix fifo polling timeout" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x c80ee36ac8f9e9c27d8e097a2eaaf198e7534c83 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024100156-hacksaw-elephant-82f1@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: c80ee36ac8f9 ("serial: qcom-geni: fix fifo polling timeout") 8ece7b754bc3 ("serial: qcom-geni: fix opp vote on shutdown") 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA") 40ec6d41c841 ("tty: serial: qcom-geni-serial: use of_device_id data") 0626afe57b1f ("tty: serial: qcom-geni-serial: drop the return value from handle_rx") bd7955840cbe ("tty: serial: qcom-geni-serial: refactor qcom_geni_serial_send_chunk_fifo()") d420fb491cbc ("tty: serial: qcom-geni-serial: split out the FIFO tx code") fe6a00e8fcbe ("tty: serial: qcom-geni-serial: refactor qcom_geni_serial_isr()") 00ce7c6e86b5 ("tty: serial: qcom-geni-serial: improve the to_dev_port() macro") 6cde11dbf4b6 ("tty: serial: qcom-geni-serial: align #define values") 68c6bd92c86c ("tty: serial: qcom-geni-serial: remove unused symbols") d0fabb0dc1a6 ("tty: serial: qcom-geni-serial: drop unneeded forward definitions") 35781d8356a2 ("tty: serial: qcom-geni-serial: Add support for Hibernation feature") 654a8d6c93e7 ("tty: serial: qcom-geni-serial: Implement start_rx callback") c2194bc999d4 ("tty: serial: qcom-geni-serial: Remove uart frequency table. Instead, find suitable frequency with call to clk_round_rate.") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From c80ee36ac8f9e9c27d8e097a2eaaf198e7534c83 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan+linaro(a)kernel.org> Date: Fri, 6 Sep 2024 15:13:29 +0200 Subject: [PATCH] serial: qcom-geni: fix fifo polling timeout MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The qcom_geni_serial_poll_bit() can be used to wait for events like command completion and is supposed to wait for the time it takes to clear a full fifo before timing out. As noted by Doug, the current implementation does not account for start, stop and parity bits when determining the timeout. The helper also does not currently account for the shift register and the two-word intermediate transfer register. A too short timeout can specifically lead to lost characters when waiting for a transfer to complete as the transfer is cancelled on timeout. Instead of determining the poll timeout on every call, store the fifo timeout when updating it in set_termios() and make sure to take the shift and intermediate registers into account. Note that serial core has already added a 20 ms margin to the fifo timeout. Also note that the current uart_fifo_timeout() interface does unnecessary calculations on every call and did not exist in earlier kernels so only store its result once. This facilitates backports too as earlier kernels can derive the timeout from uport->timeout, which has since been removed. Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP") Cc: stable(a)vger.kernel.org # 4.17 Reported-by: Douglas Anderson <dianders(a)chromium.org> Tested-by: Nícolas F. R. A. Prado <nfraprado(a)collabora.com> Signed-off-by: Johan Hovold <johan+linaro(a)kernel.org> Link: https://lore.kernel.org/r/20240906131336.23625-2-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 69a632fefc41..309c0bddf26a 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -124,7 +124,7 @@ struct qcom_geni_serial_port { dma_addr_t tx_dma_addr; dma_addr_t rx_dma_addr; bool setup; - unsigned int baud; + unsigned long poll_timeout_us; unsigned long clk_rate; void *rx_buf; u32 loopback; @@ -270,22 +270,13 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport, { u32 reg; struct qcom_geni_serial_port *port; - unsigned int baud; - unsigned int fifo_bits; unsigned long timeout_us = 20000; struct qcom_geni_private_data *private_data = uport->private_data; if (private_data->drv) { port = to_dev_port(uport); - baud = port->baud; - if (!baud) - baud = 115200; - fifo_bits = port->tx_fifo_depth * port->tx_fifo_width; - /* - * Total polling iterations based on FIFO worth of bytes to be - * sent at current baud. Add a little fluff to the wait. - */ - timeout_us = ((fifo_bits * USEC_PER_SEC) / baud) + 500; + if (port->poll_timeout_us) + timeout_us = port->poll_timeout_us; } /* @@ -1244,11 +1235,11 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, unsigned long clk_rate; u32 ver, sampling_rate; unsigned int avg_bw_core; + unsigned long timeout; qcom_geni_serial_stop_rx(uport); /* baud rate */ baud = uart_get_baud_rate(uport, termios, old, 300, 4000000); - port->baud = baud; sampling_rate = UART_OVERSAMPLING; /* Sampling rate is halved for IP versions >= 2.5 */ @@ -1326,9 +1317,21 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, else tx_trans_cfg |= UART_CTS_MASK; - if (baud) + if (baud) { uart_update_timeout(uport, termios->c_cflag, baud); + /* + * Make sure that qcom_geni_serial_poll_bitfield() waits for + * the FIFO, two-word intermediate transfer register and shift + * register to clear. + * + * Note that uart_fifo_timeout() also adds a 20 ms margin. + */ + timeout = jiffies_to_usecs(uart_fifo_timeout(uport)); + timeout += 3 * timeout / port->tx_fifo_depth; + WRITE_ONCE(port->poll_timeout_us, timeout); + } + if (!uart_console(uport)) writel(port->loopback, uport->membase + SE_UART_LOOPBACK_CFG);

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