[RFC PATCH v2 2/6] mmc: sdhci: add quirk for tuning work around
From: Vincent Yang <hidden>
Date: 2014-06-26 06:23:28
Also in:
linux-devicetree, linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
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: Vincent Yang <redacted> --- drivers/mmc/host/sdhci.c | 2 ++ include/linux/mmc/sdhci.h | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index d62262b..900b4e4 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -1867,6 +1867,8 @@ 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); /*
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 5433f04..bcbad45 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h@@ -100,6 +100,8 @@ struct sdhci_host { #define SDHCI_QUIRK2_BROKEN_DDR50 (1<<7) /* Do a callback when switching voltages so do controller-specific actions */ #define SDHCI_QUIRK2_VOLTAGE_SWITCH (1<<8) +/* forced tuned clock */ +#define SDHCI_QUIRK2_TUNING_WORK_AROUND (1<<9) int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */
--
1.9.0