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Commit 67d0d04a authored by Vincent Yang's avatar Vincent Yang Committed by Ulf Hansson
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mmc: sdhci: add a quirk for tuning work around 



This patch defines a quirk for tuning work
around for some sdhci host controller. It sets
both SDHCI_CTRL_EXEC_TUNING and SDHCI_CTRL_TUNED_CLK
for tuning.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.

Signed-off-by: default avatarVincent Yang <Vincent.Yang@tw.fujitsu.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 9d967a61

drivers/mmc/host/sdhci.c

+2 −0
Original line number Diff line number Diff line
@@ -1961,6 +1961,8 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) 


	ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);

	ctrl |= SDHCI_CTRL_EXEC_TUNING;

	if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)

		ctrl |= SDHCI_CTRL_TUNED_CLK;

	sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);



	/*

include/linux/mmc/sdhci.h

+2 −0
Original line number Diff line number Diff line
@@ -111,6 +111,8 @@ struct sdhci_host { 
#define SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD	(1<<10)

/* Capability register bit-63 indicates HS400 support */

#define SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400		(1<<11)

/* forced tuned clock */

#define SDHCI_QUIRK2_TUNING_WORK_AROUND			(1<<12)



	int irq;		/* Device IRQ */

	void __iomem *ioaddr;	/* Mapped address */