Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH 5/5] mmc: bfin_sdh: Reset SD controller when resume from power saving mode. | Date | Wed, 16 May 2012 15:50:37 +0800 |
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From: Sonic Zhang <sonic.zhang@analog.com>
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> --- drivers/mmc/host/bfin_sdh.c | 35 +++++++++++++++++++---------------- 1 files changed, 19 insertions(+), 16 deletions(-)
diff --git a/drivers/mmc/host/bfin_sdh.c b/drivers/mmc/host/bfin_sdh.c index b31e1ab..751edf6 100644 --- a/drivers/mmc/host/bfin_sdh.c +++ b/drivers/mmc/host/bfin_sdh.c @@ -466,6 +466,23 @@ 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; @@ -542,19 +559,8 @@ 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; @@ -621,10 +627,7 @@ 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); -- 1.7.0.4
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