[PATCH v5] mmc: sdhci-omap: Don't finish_mrq() on a command error during tuning

From: Faiz Abbas
Date: Fri Mar 29 2019 - 08:11:08 EST


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

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..9f2af89ae9b5 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 irqreturn_t 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