diff options
| author | Sonny Rao <sonnyrao@chromium.org> | 2014-10-16 20:58:05 +0400 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2014-11-10 14:40:35 +0300 |
| commit | 536f6b91d21b81bec6c8a675b3a00052ee05f986 (patch) | |
| tree | c9e998819fd46fc6a64bd0b12bcfcf7cef86a511 /drivers/mmc/host/dw_mmc.c | |
| parent | 390e316c606de2f839389698f4531004cfe1bafd (diff) | |
| download | linux-536f6b91d21b81bec6c8a675b3a00052ee05f986.tar.xz | |
mmc: dw_mmc: Reset DMA before enabling IDMAC
We've already got a reset of DMA after it's done. Add one before we
start DMA too. This fixes a data corruption on Rockchip SoCs which
will get bad data when doing a DMA transfer after doing a PIO transfer.
We tested this on an Exynos 5800 with HS200 and didn't notice any
difference in sequential read throughput.
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 69f0cc68d5b2..ca67f6923bfd 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -83,6 +83,7 @@ struct idmac_desc { #endif /* CONFIG_MMC_DW_IDMAC */ static bool dw_mci_reset(struct dw_mci *host); +static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset); #if defined(CONFIG_DEBUG_FS) static int dw_mci_req_show(struct seq_file *s, void *v) @@ -448,6 +449,10 @@ static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len) dw_mci_translate_sglist(host, host->data, sg_len); + /* Make sure to reset DMA in case we did PIO before this */ + dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET); + dw_mci_idmac_reset(host); + /* Select IDMAC interface */ temp = mci_readl(host, CTRL); temp |= SDMMC_CTRL_USE_IDMAC; |