mmc: sdhci-msm: Deactivate CQE during SDHC reset

When SDHC gets reset (E.g. in runtime suspend path), CQE also gets
reset and goes to disable state. But s/w state still points it as CQE
is in enabled state. Since s/w and h/w states goes out of sync,
it results in s/w request timeout for subsequent CQE requests.

To synchronize CQE s/w and h/w state during SDHC reset,
explicitly deactivate CQE just before SDHC reset.

Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1583503724-13943-3-git-send-email-vbadigan@codeaurora.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 53b79ee..09ff731 100644 (file)
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1823,6 +1823,13 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
        pr_debug("%s: supported caps: 0x%08x\n", mmc_hostname(mmc), caps);
 }
 
+static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
+{
+       if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL))
+               cqhci_deactivate(host->mmc);
+       sdhci_reset(host, mask);
+}
+
 static const struct sdhci_msm_variant_ops mci_var_ops = {
        .msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
        .msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
@@ -1861,7 +1868,7 @@ static const struct of_device_id sdhci_msm_dt_match[] = {
 MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);
 
 static const struct sdhci_ops sdhci_msm_ops = {
-       .reset = sdhci_reset,
+       .reset = sdhci_msm_reset,
        .set_clock = sdhci_msm_set_clock,
        .get_min_clock = sdhci_msm_get_min_clock,
        .get_max_clock = sdhci_msm_get_max_clock,