mmc: at91_mci: do not read irq status twice as it will forget some errors

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@atmel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 9b546a9..e1f91a4 100644 (file)
--- 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));