[U-Boot] [PATCH v2] mmc: increase MMC SDHCI read status timeout

[Steve Rae]

Otherwise,  ocassionally see errors like this:
  Flashing sparse image at offset 2078720
  Flashing Sparse Image
  sdhci_send_command: Timeout for status update!
  mmc fail to send stop cmd
  write_sparse_image: Write failed, block #2181088 [0]

This does not affect the actual writing speed, which is controlled by
the default value:
  CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT

It only increases the retries when reading:
  SDHCI_INT_STATUS
to avoid the timeout error.

Signed-off-by: Steve Rae <steve.rae at raedomain.com>
Reviewed-by: Stefan Roese <sr at denx.de>
Tested-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---
as per the discussion in:
http://lists.denx.de/pipermail/u-boot/2016-June/258966.html
this supercedes:
http://patchwork.ozlabs.org/patch/615994/

Changes in v2:
dropped "CONFIG_" from the #define
dropped "arm:" in the commit message

 drivers/mmc/sdhci.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 5c71ab8..604f18d 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -127,6 +127,7 @@ static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
 #define CONFIG_SDHCI_CMD_MAX_TIMEOUT		3200
 #endif
 #define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT	100
+#define SDHCI_READ_STATUS_TIMEOUT		1000
 
 static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 		       struct mmc_data *data)
@@ -243,9 +244,9 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 		if (stat & SDHCI_INT_ERROR)
 			break;
 	} while (((stat & mask) != mask) &&
-		 (get_timer(start) < CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT));
+		 (get_timer(start) < SDHCI_READ_STATUS_TIMEOUT));
 
-	if (get_timer(start) >= CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT) {
+	if (get_timer(start) >= SDHCI_READ_STATUS_TIMEOUT) {
 		if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
 			return 0;
 		else {
-- 
1.8.5