openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

mmc: omap_hsmmc: fix timeout for cmd and data soft reset 

With HSMMC_HAS_UPDATED_RESET reset of cmd/data (SRC/SRD) can be to
quick and can be missed resulting in wait for software timeout.
With cpu_relax timeout can be long and unpredictable. Use udelay
instead for timeout implementation.

Reported-by: Yuzheng Ma <mayuzheng@kedacom.com>
Tested-by: Yuzheng Ma <mayuzheng@kedacom.com>
Reviewed-by: Hein Tibosch <hein_tibosch@yahoo.es>
Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Jianpeng Ma 2013-10-21 00:25:20 +05:30 committed by Chris Ball
parent 0a82e06e61
commit 1e881786c9
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/mmc/host/omap_hsmmc.c
View File

@ -119,7 +119,8 @@
BRR_EN | BWR_EN | TC_EN | CC_EN)
#define MMC_AUTOSUSPEND_DELAY 100
#define MMC_TIMEOUT_MS 20
#define MMC_TIMEOUT_MS 20 /* 20 mSec */
#define MMC_TIMEOUT_US 20000 /* 20000 micro Sec */
#define OMAP_MMC_MIN_CLOCK 400000
#define OMAP_MMC_MAX_CLOCK 52000000
#define DRIVER_NAME "omap_hsmmc"
@ -967,8 +968,7 @@ static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
unsigned long bit)
{
unsigned long i = 0;
unsigned long limit = (loops_per_jiffy *
msecs_to_jiffies(MMC_TIMEOUT_MS));
unsigned long limit = MMC_TIMEOUT_US;
OMAP_HSMMC_WRITE(host->base, SYSCTL,
OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
@ -980,13 +980,13 @@ static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
&& (i++ < limit))
cpu_relax();
udelay(1);
}
i = 0;
while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
(i++ < limit))
cpu_relax();
udelay(1);
if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
dev_err(mmc_dev(host->mmc),