5.4-stable review patch. If anyone has any objections, please let me know.
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From: Sean Rhodes sean@starlabs.systems
commit 235b630eda072d7e7b102ab346d6b8a2c028a772 upstream.
This commit reintroduces interrupt-based card detection previously used in the rts5139 driver. This functionality was removed in commit 00d8521dcd23 ("staging: remove rts5139 driver code").
Reintroducing this mechanism fixes presence detection for certain card readers, which with the current driver, will taken approximately 20 seconds to enter S3 as `mmc_rescan` has to be frozen.
Fixes: 00d8521dcd23 ("staging: remove rts5139 driver code") Cc: stable@vger.kernel.org Cc: Arnd Bergmann arnd@arndb.de Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sean Rhodes sean@starlabs.systems Link: https://lore.kernel.org/r/20241119085815.11769-1-sean@starlabs.systems Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/misc/cardreader/rtsx_usb.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
--- a/drivers/misc/cardreader/rtsx_usb.c +++ b/drivers/misc/cardreader/rtsx_usb.c @@ -286,6 +286,7 @@ static int rtsx_usb_get_status_with_bulk int rtsx_usb_get_card_status(struct rtsx_ucr *ucr, u16 *status) { int ret; + u8 interrupt_val = 0; u16 *buf;
if (!status) @@ -308,6 +309,20 @@ int rtsx_usb_get_card_status(struct rtsx ret = rtsx_usb_get_status_with_bulk(ucr, status); }
+ rtsx_usb_read_register(ucr, CARD_INT_PEND, &interrupt_val); + /* Cross check presence with interrupts */ + if (*status & XD_CD) + if (!(interrupt_val & XD_INT)) + *status &= ~XD_CD; + + if (*status & SD_CD) + if (!(interrupt_val & SD_INT)) + *status &= ~SD_CD; + + if (*status & MS_CD) + if (!(interrupt_val & MS_INT)) + *status &= ~MS_CD; + /* usb_control_msg may return positive when success */ if (ret < 0) return ret;