diff options
| author | Sahitya Tummala <stummala@codeaurora.org> | 2016-04-05 15:27:36 +0530 |
|---|---|---|
| committer | Kyle Yan <kyan@codeaurora.org> | 2016-06-13 19:06:24 -0700 |
| commit | f8fb46ff55ba1d99f7debfc33ce69ecbf936e586 (patch) | |
| tree | bfd20d9d47aeddcbcbf6b17969ed314ba974e602 | |
| parent | 7b9f9abcdafb8a1a454208f7070f205873b3e541 (diff) | |
mmc: sdhci: Add new quirk to use PIO for eMMC tuning commands
Some controllers have an issue using ADMA for tuning commands.
Add a quirk - SDHCI_QUIRK2_USE_PIO_FOR_EMMC_TUNING to use PIO
mode for tuning commands on those host controllers.
Change-Id: Id9625167d7e235fb3a20a6193889c1654b5c0cd8
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 4 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 6 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 189f5969c69e..58a06528c051 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -858,6 +858,10 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) host->flags |= SDHCI_REQ_USE_DMA; + if ((host->quirks2 & SDHCI_QUIRK2_USE_PIO_FOR_EMMC_TUNING) && + cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200) + host->flags &= ~SDHCI_REQ_USE_DMA; + /* * FIXME: This doesn't account for merging when mapping the * scatterlist. diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 7dcf6fe4d30d..da963972b9a4 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -507,6 +507,12 @@ struct sdhci_host { * phase. */ #define SDHCI_QUIRK2_NON_STANDARD_TUNING (1 << 28) +/* + * Some controllers may use PIO mode to workaround HW issues in ADMA for + * eMMC tuning commands. + */ +#define SDHCI_QUIRK2_USE_PIO_FOR_EMMC_TUNING (1 << 23) + int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */ |