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mmc: sdhci: Add new quirk to use PIO for eMMC tuning commands

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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>
This commit is contained in:
Sahitya Tummala 2016-04-05 15:27:36 +05:30 • committed by Kyle Yan
parent 7b9f9abcda
commit f8fb46ff55
2 changed files with 10 additions and 0 deletions
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4
drivers/mmc/host/sdhci.c
View file

@ -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)) if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
host->flags |= SDHCI_REQ_USE_DMA; 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 * FIXME: This doesn't account for merging when mapping the
* scatterlist. * scatterlist.

6
drivers/mmc/host/sdhci.h
View file

@ -507,6 +507,12 @@ struct sdhci_host {
* phase. * phase.
*/ */
#define SDHCI_QUIRK2_NON_STANDARD_TUNING (1 << 28) #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 */ int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */ void __iomem *ioaddr; /* Mapped address */