mmc: sdhci: Add a quirk for broken command queuing

commit 75d27ea1abf7af3cc2cdec3513e74f52191605c8 upstream.

Command queuing has been reported broken on some systems based on Intel
GLK. A separate patch disables command queuing in some cases.

This patch adds a quirk for broken command queuing, which enables users
with problems to disable command queuing using sdhci module parameters for
quirks.

Fixes: 8ee82bda230f ("mmc: sdhci-pci: Add CQHCI support for Intel GLK")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20191217095349.14592-2-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 6da1594..5f9df2d 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3756,6 +3756,9 @@ int sdhci_setup_host(struct sdhci_host *host)
                       mmc_hostname(mmc), host->version);
        }
 
+       if (host->quirks & SDHCI_QUIRK_BROKEN_CQE)
+               mmc->caps2 &= ~MMC_CAP2_CQE;
+
        if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
                host->flags |= SDHCI_USE_SDMA;
        else if (!(host->caps & SDHCI_CAN_DO_SDMA))

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 0ed3e0e..fe83ece 100644 (file)
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -409,6 +409,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK_BROKEN_CARD_DETECTION              (1<<15)
 /* Controller reports inverted write-protect state */
 #define SDHCI_QUIRK_INVERTED_WRITE_PROTECT             (1<<16)
+/* Controller has unusable command queue engine */
+#define SDHCI_QUIRK_BROKEN_CQE                         (1<<17)
 /* Controller does not like fast PIO transfers */
 #define SDHCI_QUIRK_PIO_NEEDS_DELAY                    (1<<18)
 /* Controller does not have a LED */