[PATCH 7/7] mmc: at91_mci: do not read irq status twice as it willforget some errors

[Nicolas Ferre]

Reading AT91_MCI_SR again at the end of transfer can corrupt the
error reporting. Some fields in the SR register are read-and-clear.

Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
---
drivers/mmc/host/at91_mci.c |   12 +++++-------
1 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 92a0200..9948fe1 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -660,10 +660,9 @@ static void at91_mci_process_next(struct at91mci_host *host)
/*
 * Handle a command that has been completed
 */
-static void at91_mci_completed_command(struct at91mci_host *host)
+static void at91_mci_completed_command(struct at91mci_host *host, unsigned int status)
{
	struct mmc_command *cmd = host->cmd;
-	unsigned int status;

	at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));

@@ -677,10 +676,9 @@ static void at91_mci_completed_command(struct at91mci_host *host)
		host->buffer = NULL;
	}

-	status = at91_mci_read(host, AT91_MCI_SR);
-
-	pr_debug("Status = %08X [%08X %08X %08X %08X]\n",
-		 status, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
+	pr_debug("Status = %08X/%08x [%08X %08X %08X %08X]\n",
+		 status, at91_mci_read(host, AT91_MCI_SR),
+		 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);

	if (status & AT91_MCI_ERRORS) {
		if ((status & AT91_MCI_RCRCE) && !(mmc_resp_type(cmd) & MMC_RSP_CRC)) {
@@ -877,7 +875,7 @@ static irqreturn_t at91_mci_irq(int irq, void *devid)
	if (completed) {
		pr_debug("Completed command\n");
		at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
-		at91_mci_completed_command(host);
+		at91_mci_completed_command(host, int_status);
	} else
		at91_mci_write(host, AT91_MCI_IDR, int_status & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));

--
1.5.3.7


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