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: Vincent Yang <Vincent.Yang@tw.fujitsu.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3e4fe967d7e5..a3ecd20e5510 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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);
 
         /*
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index cb8b94ff6a26..933b897ca095 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -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 */