linux-kernel - [RFC 4/4] mmc: sdhci-msm: Handle unexpected interrupt case on enabling legacy IRQs on CQE halt

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Date:   Wed, 30 Aug 2017 18:29:59 +0530
From:   Ritesh Harjani <rharjani@....qualcomm.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stummala@...eaurora.org, asutoshd@...eaurora.org,
        Ritesh Harjani <riteshh@...eaurora.org>
Subject: [RFC 4/4] mmc: sdhci-msm: Handle unexpected interrupt case on enabling legacy IRQs on CQE halt

From: Ritesh Harjani <riteshh@...eaurora.org>

There is a case when enabling the legacy IRQs and halting CQE is
resuling into a command response interrupt without any command in
progress. This patch handles such case here.

Error signature without this patch:-
mmc0: Got command interrupt 0x00000001 even though no command operation
was in progress.

Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
---
 drivers/mmc/host/sdhci-msm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index baa3409..8fdc2c0 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1124,10 +1124,21 @@ void sdhci_msm_cqe_enable(struct mmc_host *mmc)
 void sdhci_msm_cqe_disable(struct mmc_host *mmc, bool recovery)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	u32 ctrl;
 
 	if (host->flags & SDHCI_USE_64_BIT_DMA)
 		host->desc_sz = 16;
 
+	spin_lock_irqsave(&host->lock, flags);
+
+	ctrl = sdhci_readl(host, SDHCI_INT_ENABLE);
+	ctrl |= SDHCI_INT_RESPONSE;
+	sdhci_writel(host,  ctrl, SDHCI_INT_ENABLE);
+	sdhci_writel(host, SDHCI_INT_RESPONSE, SDHCI_INT_STATUS);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
 	sdhci_cqe_disable(mmc, recovery);
 }
 
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.