linux-kernel - [PATCH V2] mmc: sdhci-msm: Update system suspend/resume callbacks of sdhci-msm platform driver.

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Date:   Fri,  7 Feb 2020 18:50:50 +0530
From:   Shaik Sajida Bhanu <sbhanu@...eaurora.org>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        robh+dt@...nel.org, mka@...omium.org
Cc:     asutoshd@...eaurora.org, stummala@...eaurora.org,
        sayalil@...eaurora.org, cang@...eaurora.org,
        rampraka@...eaurora.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, agross@...nel.org,
        bjorn.andersson@...aro.org,
        Shaik Sajida Bhanu <sbhanu@...eaurora.org>
Subject: [PATCH V2] mmc: sdhci-msm: Update system suspend/resume callbacks of sdhci-msm platform driver.

The existing suspend/resume callbacks of sdhci-msm driver are just
gating/un-gating the clocks. During suspend cycle more can be done
like disabling controller, interrupts and card detection.

So updating the system pm callbacks for performing these extra
actions besides controlling the clocks.

Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org>

Changes since V1:
	Addressed review comments
---
 drivers/mmc/host/sdhci-msm.c | 50 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index c3a160c..e30c8a3 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -2159,9 +2159,55 @@ static __maybe_unused int sdhci_msm_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static int sdhci_msm_suspend(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+	int ret;
+
+	if (host->mmc->caps2 & MMC_CAP2_CQE) {
+		ret = cqhci_suspend(host->mmc);
+		if (ret)
+			return ret;
+	}
+
+	ret = sdhci_suspend_host(host);
+	if (ret)
+		return ret;
+	/* Disable pwr-irq since SDHC would be inactive */
+	disable_irq(msm_host->pwr_irq);
+
+	return pm_runtime_force_suspend(dev);
+}
+
+static int sdhci_msm_resume(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+	int ret;
+
+	ret = pm_runtime_force_resume(dev);
+	if (ret)
+		return ret;
+
+	/* Re-enable pwr irq before SDHC gets reset */
+	enable_irq(msm_host->pwr_irq);
+
+	ret = sdhci_resume_host(host);
+	if (ret < 0)
+		return ret;
+
+	if (host->mmc->caps2 & MMC_CAP2_CQE)
+		ret = cqhci_resume(host->mmc);
+
+	return ret;
+}
+
 static const struct dev_pm_ops sdhci_msm_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
-				pm_runtime_force_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(sdhci_msm_suspend,
+				sdhci_msm_resume)
 	SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend,
 			   sdhci_msm_runtime_resume,
 			   NULL)
-- 
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