mmc: sdhci: add quirk for ACMD23 broken

Add quirk to handle broken auto-CMD23.
Some controllers do not respond after the first auto-CMD23 is issued.

This allows CMD23 to still work (mandatory for the faster UHS-I mode)
rather than disabling CMD23 entirely via SDHCI_QUIRK2_HOST_NO_CMD23.

Signed-off by: Corneliu Doban <cdoban@broadcom.com>
Signed-off-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 0ad412a..5cf35e5 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3164,7 +3164,8 @@ int sdhci_add_host(struct sdhci_host *host)
        /* Auto-CMD23 stuff only works in ADMA or PIO. */
        if ((host->version >= SDHCI_SPEC_300) &&
            ((host->flags & SDHCI_USE_ADMA) ||
-            !(host->flags & SDHCI_USE_SDMA))) {
+            !(host->flags & SDHCI_USE_SDMA)) &&
+            !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
                host->flags |= SDHCI_AUTO_CMD23;
                DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
        } else {

diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index c3e3db1..1bafb1e 100644 (file)
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -115,6 +115,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_TUNING_WORK_AROUND                        (1<<12)
 /* disable the block count for single block transactions */
 #define SDHCI_QUIRK2_SUPPORT_SINGLE                    (1<<13)
+/* Controller broken with using ACMD23 */
+#define SDHCI_QUIRK2_ACMD23_BROKEN                     (1<<14)
 
        int irq;                /* Device IRQ */
        void __iomem *ioaddr;   /* Mapped address */