[PATCH V2] mmc: sdhci-msm: Disable CQE during SDHC reset

Veerabhadrarao Badiganti
2020-03-04T11:54:58Z

When SDHC gets reset (E.g. in 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 disable CQE after reset.

Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
---
Changes since V1:
- Disable CQE only when SDHC undergoes s/w reset for all.
---
drivers/mmc/host/sdhci-msm.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 53b79ee..75929d3 100644
--- 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)
+{
+ sdhci_reset(host, mask);
+ if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL))
+ cqhci_suspend(host->mmc);
+}
+
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 void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
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,
--
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