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Commit f8fb46ff authored by Sahitya Tummala's avatar Sahitya Tummala Committed by Kyle Yan
Browse files

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: default avatarSahitya Tummala <stummala@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
parent 7b9f9abc

drivers/mmc/host/sdhci.c

+4 −0
Original line number Diff line number Diff line
@@ -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.

drivers/mmc/host/sdhci.h

+6 −0
Original line number Diff line number Diff line
@@ -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 */