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

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Message-Id: <1582890639-32072-1-git-send-email-vbadigan@codeaurora.org>
Date:   Fri, 28 Feb 2020 17:20:32 +0530
From:   Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH] mmc: sdhci-msm: Disable CQE during SDHC reset

When SDHC gets reset (E.g. in suspend/resume 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@...eaurora.org>
---
 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..d7ba3b2 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)
+		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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