The patch below does not apply to the 3.18-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@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5603731a15ef9ca317c122cc8c959f1dee1798b4 Mon Sep 17 00:00:00 2001

From: Takeshi Saito takeshi.saito.xv@renesas.com Date: Thu, 21 Feb 2019 20:38:05 +0100 Subject: [PATCH] mmc: tmio: fix access width of Block Count Register

In R-Car Gen2 or later, the maximum number of transfer blocks are changed from 0xFFFF to 0xFFFFFFFF. Therefore, Block Count Register should use iowrite32().

If another system (U-boot, Hypervisor OS, etc) uses bit[31:16], this value will not be cleared. So, SD/MMC card initialization fails.

So, check for the bigger register and use apropriate write. Also, mark the register as extended on Gen2.

Signed-off-by: Takeshi Saito takeshi.saito.xv@renesas.com [wsa: use max_blk_count in if(), add Gen2, update commit message] Signed-off-by: Wolfram Sang wsa+renesas@sang-engineering.com Cc: stable@kernel.org Reviewed-by: Simon Horman horms+renesas@verge.net.au [Ulf: Fixed build error] Signed-off-by: Ulf Hansson ulf.hansson@linaro.org

diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c index 8471160316e0..02cd878e209f 100644 --- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c +++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c @@ -65,6 +65,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = { .scc_offset = 0x0300, .taps = rcar_gen2_scc_taps, .taps_num = ARRAY_SIZE(rcar_gen2_scc_taps), + .max_blk_count = 0xffffffff, };

/* Definitions for sampling clocks */ diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index c03529e3f01a..2adb0d24360f 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -277,6 +277,11 @@ static inline void sd_ctrl_write32_as_16_and_16(struct tmio_mmc_host *host, iowrite16(val >> 16, host->ctl + ((addr + 2) << host->bus_shift)); }

+static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val) +{ + iowrite32(val, host->ctl + (addr << host->bus_shift)); +} + static inline void sd_ctrl_write32_rep(struct tmio_mmc_host *host, int addr, const u32 *buf, int count) { diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c index 41d79720e745..f7a6f005899a 100644 --- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -43,6 +43,7 @@ #include <linux/regulator/consumer.h> #include <linux/mmc/sdio.h> #include <linux/scatterlist.h> +#include <linux/sizes.h> #include <linux/spinlock.h> #include <linux/swiotlb.h> #include <linux/workqueue.h> @@ -703,7 +704,10 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host,

/* Set transfer length / blocksize */ sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz); - sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks); + if (host->mmc->max_blk_count >= SZ_64K) + sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks); + else + sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);

tmio_mmc_start_dma(host, data);