mmc: dw_mmc: Zap endless timeout

Endless timeouts are bad, since if we get stuck in one, we have no
way out. Zap this one by implementing proper timeout.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: Tom Rini <trini@konsulko.com>

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 3fffa71..0f61f16 100644 (file)
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -211,14 +211,29 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
        }
 
        if (data) {
-               do {
+               start = get_timer(0);
+               timeout = 1000;
+               for (;;) {
                        mask = dwmci_readl(host, DWMCI_RINTSTS);
+                       /* Error during data transfer. */
                        if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
                                printf("%s: DATA ERROR!\n", __func__);
                                bounce_buffer_stop(&bbstate);
                                return -1;
                        }
-               } while (!(mask & DWMCI_INTMSK_DTO));
+
+                       /* Data arrived correctly. */
+                       if (mask & DWMCI_INTMSK_DTO)
+                               break;
+
+                       /* Check for timeout. */
+                       if (get_timer(start) > timeout) {
+                               printf("%s: Timeout waiting for data!\n",
+                                      __func__);
+                               bounce_buffer_stop(&bbstate);
+                               return TIMEOUT;
+                       }
+               }
 
                dwmci_writel(host, DWMCI_RINTSTS, mask);