linux-kernel - [PATCH v6] mmc: sdhci-omap: Don't finish_mrq() on a command error during tuning

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Message-ID: <20190411085937.633-1-faiz_abbas@ti.com>
Date:   Thu, 11 Apr 2019 14:29:37 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <linux-omap@...r.kernel.org>
CC:     <ulf.hansson@...aro.org>, <kishon@...com>,
        <adrian.hunter@...el.com>, <faiz_abbas@...com>
Subject: [PATCH v6] mmc: sdhci-omap: Don't finish_mrq() on a command error during tuning

commit 5b0d62108b46 ("mmc: sdhci-omap: Add platform specific reset
callback") skips data resets during tuning operation. Because of this,
a data error or data finish interrupt might still arrive after a command
error has been handled and the mrq ended. This ends up with a "mmc0: Got
data interrupt 0x00000002 even though no data operation was in progress"
error message.

Fix this by adding a platform specific callback for sdhci_irq. Mark the
mrq as a failure but wait for a data interrupt instead of calling
finish_mrq().

Fixes: 5b0d62108b46 ("mmc: sdhci-omap: Add platform specific reset
callback")
Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
---

Tested with 100 times boot tests on dra71x-evm, dra72x-evm and
dra7xx-evm.

v6:
Changed return value to u32 to fix the build warning.

v5:
Drop patch 1 and replace call to sdhci_finish_command() with
host->cmd = NULL

v4:
Fixed commit description for patch 1.
Added SDHCI_INT_TIMEOUT to CMD_ERR_MASK in patch 2.

v3:
Removed the command error specific callback and using the already
existing sdhci_irq callback instead. No measurable drop in performance.

v2:
Added EXPORT_SYMBOL_GPL for sdhci_cmd_err and sdhci_send_command to fix
errors when built as module.

 drivers/mmc/host/sdhci-omap.c | 38 +++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 5bbed477c9b1..9f20fff9781b 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -797,6 +797,43 @@ void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
 	sdhci_reset(host, mask);
 }
 
+#define CMD_ERR_MASK (SDHCI_INT_CRC | SDHCI_INT_END_BIT | SDHCI_INT_INDEX |\
+		      SDHCI_INT_TIMEOUT)
+#define CMD_MASK (CMD_ERR_MASK | SDHCI_INT_RESPONSE)
+
+static u32 sdhci_omap_irq(struct sdhci_host *host, u32 intmask)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+
+	if (omap_host->is_tuning && host->cmd && !host->data_early &&
+	    (intmask & CMD_ERR_MASK)) {
+
+		/*
+		 * Since we are not resetting data lines during tuning
+		 * operation, data error or data complete interrupts
+		 * might still arrive. Mark this request as a failure
+		 * but still wait for the data interrupt
+		 */
+		if (intmask & SDHCI_INT_TIMEOUT)
+			host->cmd->error = -ETIMEDOUT;
+		else
+			host->cmd->error = -EILSEQ;
+
+		host->cmd = NULL;
+
+		/*
+		 * Sometimes command error interrupts and command complete
+		 * interrupt will arrive together. Clear all command related
+		 * interrupts here.
+		 */
+		sdhci_writel(host, intmask & CMD_MASK, SDHCI_INT_STATUS);
+		intmask &= ~CMD_MASK;
+	}
+
+	return intmask;
+}
+
 static struct sdhci_ops sdhci_omap_ops = {
 	.set_clock = sdhci_omap_set_clock,
 	.set_power = sdhci_omap_set_power,
@@ -807,6 +844,7 @@ static struct sdhci_ops sdhci_omap_ops = {
 	.platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
 	.reset = sdhci_omap_reset,
 	.set_uhs_signaling = sdhci_omap_set_uhs_signaling,
+	.irq = sdhci_omap_irq,
 };
 
 static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
-- 
2.19.2