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mmc: bfin_sdh: Reset SD controller when resume from power saving mode.

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Without reset, SD controller may stay in disable mode, SD card can't
be detected when resume from power saving mode.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Sonic Zhang 2012-08-08 00:15:20 -04:00 committed by Chris Ball
parent c5e4a2e4c6
commit 7a8a43c46a
1 changed files with 19 additions and 16 deletions
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35
drivers/mmc/host/bfin_sdh.c
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@ -505,6 +505,23 @@ static irqreturn_t sdh_stat_irq(int irq, void *devid)
return IRQ_RETVAL(handled);
}
static void sdh_reset(void)
{
#if defined(CONFIG_BF54x)
/* Secure Digital Host shares DMA with Nand controller */
bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
#endif
bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
SSYNC();
/* Disable card inserting detection pin. set MMC_CAP_NEEDS_POLL, and
* mmc stack will do the detection.
*/
bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3));
SSYNC();
}
static int __devinit sdh_probe(struct platform_device *pdev)
{
struct mmc_host *mmc;
@ -581,19 +598,8 @@ static int __devinit sdh_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "unable to request peripheral pins\n");
goto out4;
}
#if defined(CONFIG_BF54x)
/* Secure Digital Host shares DMA with Nand controller */
bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
#endif
bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
SSYNC();
/* Disable card inserting detection pin. set MMC_CAP_NEEDS_POLL, and
* mmc stack will do the detection.
*/
bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3));
SSYNC();
sdh_reset();
mmc_add_host(mmc);
return 0;
@ -660,10 +666,7 @@ static int sdh_resume(struct platform_device *dev)
return ret;
}
#if defined(CONFIG_BF54x)
/* Secure Digital Host shares DMA with Nand controller */
bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
#endif
sdh_reset();
if (mmc)
ret = mmc_resume_host(mmc);