mmc: dw_mmc: amend using error interrupt status

RINTSTS status includes masked interrupts as well as unmasked.
data_status and cmd_status are set by value of RINTSTS in interrupt handler
and tasklet finally uses it to decide whether error is happened or not.
In addition, MINTSTS status is used for setting data_status in PIO.
Masked error interrupt will not be handled and that status can be considered
non-error case.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed By: Girish K S <girish.shivananjappa@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 72dc3cde646d063513f3a55fc8ba0ec74197261b..7baed457dc3b838f3a4cebab1a0cadf11b790704 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1547,12 +1547,11 @@ static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
 {
        struct dw_mci *host = dev_id;
-       u32 status, pending;
+       u32 pending;
        unsigned int pass_count = 0;
        int i;
 
        do {
-               status = mci_readl(host, RINTSTS);
                pending = mci_readl(host, MINTSTS); /* read-only mask reg */
 
                /*
@@ -1570,7 +1569,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
 
                if (pending & DW_MCI_CMD_ERROR_FLAGS) {
                        mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
-                       host->cmd_status = status;
+                       host->cmd_status = pending;
                        smp_wmb();
                        set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
                }
@@ -1578,7 +1577,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
                if (pending & DW_MCI_DATA_ERROR_FLAGS) {
                        /* if there is an error report DATA_ERROR */
                        mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
-                       host->data_status = status;
+                       host->data_status = pending;
                        smp_wmb();
                        set_bit(EVENT_DATA_ERROR, &host->pending_events);
                        if (!(pending & (SDMMC_INT_DTO | SDMMC_INT_DCRC |
@@ -1589,7 +1588,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
                if (pending & SDMMC_INT_DATA_OVER) {
                        mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
                        if (!host->data_status)
-                               host->data_status = status;
+                               host->data_status = pending;
                        smp_wmb();
                        if (host->dir_status == DW_MCI_RECV_STATUS) {
                                if (host->sg != NULL)
@@ -1613,7 +1612,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
 
                if (pending & SDMMC_INT_CMD_DONE) {
                        mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
-                       dw_mci_cmd_interrupt(host, status);
+                       dw_mci_cmd_interrupt(host, pending);
                }
 
                if (pending & SDMMC_INT_CD) {