korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-20 02:34:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

ARM: 7623/1: mmc: mmci: Fixup clock gating when freq is 0 for ST-variants

Browse Source 
In the ST Micro variant, the MMCICLOCK register must not be used to
gate the clock. Instead use MMCIPOWER register and by clearing the
PWR_ON bit to do this.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ulf Hansson 2013-01-09 17:19:54 +01:00 committed by Russell King
parent 8259293aee
commit f4670daef5
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/mmc/host/mmci.c
View File

@ -60,6 +60,7 @@ static unsigned int fmax = 515633;
* @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
* @pwrreg_powerup: power up value for MMCIPOWER register
* @signal_direction: input/out direction of bus signals can be indicated
* @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
*/
struct variant_data {
unsigned int clkreg;
@ -72,6 +73,7 @@ struct variant_data {
bool blksz_datactrl16;
u32 pwrreg_powerup;
bool signal_direction;
bool pwrreg_clkgate;
};
static struct variant_data variant_arm = {
@ -96,6 +98,7 @@ static struct variant_data variant_u300 = {
.sdio = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
};
static struct variant_data variant_nomadik = {
@ -107,6 +110,7 @@ static struct variant_data variant_nomadik = {
.st_clkdiv = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
};
static struct variant_data variant_ux500 = {
@ -119,6 +123,7 @@ static struct variant_data variant_ux500 = {
.st_clkdiv = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
};
static struct variant_data variant_ux500v2 = {
@ -132,6 +137,7 @@ static struct variant_data variant_ux500v2 = {
.blksz_datactrl16 = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
};
/*
@ -1150,6 +1156,13 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
}
}
/*
* If clock = 0 and the variant requires the MMCIPOWER to be used for
* gating the clock, the MCI_PWR_ON bit is cleared.
*/
if (!ios->clock && variant->pwrreg_clkgate)
pwr &= ~MCI_PWR_ON;
spin_lock_irqsave(&host->lock, flags);
mmci_set_clkreg(host, ios->clock);