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authorKishon Vijay Abraham I <kishon@ti.com>2017-01-30 15:41:57 +0530
committerUlf Hansson <ulf.hansson@linaro.org>2017-02-13 13:20:55 +0100
commit8cc9a3e73de1264cb61d8eca4e15310f3b2b9746 (patch)
treea1993b695367cde685aeda6d99e02249314a1d01 /drivers/mmc/host/omap_hsmmc.c
parent24380dd4f8da47951ebaab26f9bfd398e83b186d (diff)
mmc: host: omap_hsmmc: use generic_cmd6_time to program timeout value for CMD6
commit e2bf08d643a244ccb ("omap_hsmmc: set a large data timeout for commands with busy signal") sets an arbitrary timeout value (100ms) for commands like CMD6 (MMC SWITCH). However extended CSD register defined in the eMMC standard has a field for GENERIC_CMD6_TIME which indicates the default maximum timeout for a SWITCH command. Use busy_timeout of cmd structure (populated with GENERIC_CMD6_TIME in the case of SWITCH command) to program the data timeout value in omap_hsmmc driver. SWITCH command to turn the cache on took more than 100ms to complete with MICRON eMMC card present in AM572x IDK REV 1.3A resulting in timeout and failed enumeration. It is fixed here by programming the timeout with the value advertised in GENERIC_CMD6_TIME. Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Ravikumar Kattekola <rk@ti.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/omap_hsmmc.c')
-rw-r--r--drivers/mmc/host/omap_hsmmc.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 0ee56505494e..51ca3d7c19ca 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1527,16 +1527,24 @@ static int
omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
{
int ret;
+ unsigned int timeout;
+
host->data = req->data;
if (req->data == NULL) {
OMAP_HSMMC_WRITE(host->base, BLK, 0);
- /*
- * Set an arbitrary 100ms data timeout for commands with
- * busy signal.
- */
- if (req->cmd->flags & MMC_RSP_BUSY)
- set_data_timeout(host, 100000000U, 0);
+ if (req->cmd->flags & MMC_RSP_BUSY) {
+ timeout = req->cmd->busy_timeout * NSEC_PER_MSEC;
+
+ /*
+ * Set an arbitrary 100ms data timeout for commands with
+ * busy signal and no indication of busy_timeout.
+ */
+ if (!timeout)
+ timeout = 100000000U;
+
+ set_data_timeout(host, timeout, 0);
+ }
return 0;
}