mmc: sdhci-pci: Fix SDHCI_RESET_ALL for CQHCI for Intel GLK-based controllers

For Intel controllers, SDHCI_RESET_ALL resets also CQHCI registers.
Normally, SDHCI_RESET_ALL is not used while CQHCI is enabled, but that can
happen on the error path. e.g. if mmc_cqe_recovery() fails, mmc_blk_reset()
is called which, for a eMMC that does not support HW Reset, will cycle the
bus power and the driver will perform SDHCI_RESET_ALL.

So whenever performing SDHCI_RESET_ALL ensure CQHCI is deactivated.
That will force the driver to reinitialize CQHCI when it is next used.

A similar change was done already for sdhci-msm, and other drivers using
CQHCI might benefit from a similar change, if they also have CQHCI reset
by SDHCI_RESET_ALL.

Fixes: 8ee82bda230fc9 ("mmc: sdhci-pci: Add CQHCI support for Intel GLK")
Cc: stable@vger.kernel.org # 5.4.x: 0ffa6cfbd949: mmc: cqhci: Add cqhci_deactivate()
Cc: stable@vger.kernel.org # 5.4+
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200819121848.16967-1-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index bb68024..af41380 100644 (file)
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -232,6 +232,14 @@ static void sdhci_pci_dumpregs(struct mmc_host *mmc)
        sdhci_dumpregs(mmc_priv(mmc));
 }
 
+static void sdhci_cqhci_reset(struct sdhci_host *host, u8 mask)
+{
+       if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL) &&
+           host->mmc->cqe_private)
+               cqhci_deactivate(host->mmc);
+       sdhci_reset(host, mask);
+}
+
 /*****************************************************************************\
  *                                                                           *
  * Hardware specific quirk handling                                          *
@@ -718,7 +726,7 @@ static const struct sdhci_ops sdhci_intel_glk_ops = {
        .set_power              = sdhci_intel_set_power,
        .enable_dma             = sdhci_pci_enable_dma,
        .set_bus_width          = sdhci_set_bus_width,
-       .reset                  = sdhci_reset,
+       .reset                  = sdhci_cqhci_reset,
        .set_uhs_signaling      = sdhci_set_uhs_signaling,
        .hw_reset               = sdhci_pci_hw_reset,
        .irq                    = sdhci_cqhci_irq,