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mmc: host: omap_hsmmc: use generic_cmd6_time to program timeout value for CMD6 

commit e2bf08d643 ("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>
This commit is contained in:
Kishon Vijay Abraham I 2017-01-30 15:41:57 +05:30 committed by Ulf Hansson
parent 24380dd4f8
commit 8cc9a3e73d
1 changed files with 14 additions and 6 deletions
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20
drivers/mmc/host/omap_hsmmc.c
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@ -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;
}