Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e113b07e authored by Sahitya Tummala's avatar Sahitya Tummala
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>
parent ddedef01

drivers/mmc/host/sdhci.c

+4 −0
Original line number Diff line number Diff line
@@ -897,6 +897,10 @@ 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.

include/linux/mmc/sdhci.h

+5 −0
Original line number Diff line number Diff line
@@ -187,6 +187,11 @@ struct sdhci_host { 
 * phase.

 */

#define SDHCI_QUIRK2_NON_STANDARD_TUNING (1 << 22)

/*

 * 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 */