* Adrian Hunter <[email protected]> [090302 04:27]: > From a2ad80abeb9550782d4962472980e47df4055434 Mon Sep 17 00:00:00 2001 > From: Kim Kyuwon <[email protected]> > Date: Fri, 20 Feb 2009 13:10:08 +0100 > Subject: [PATCH] OMAP: HSMMC: Initialize hsmmc controller registers when > resuming > > Most registers lose its state when the processor wakes up from sleep state. > Thus registers should be initialized, when the processor wakes up. However the > current hsmmc 'resume' function doesn't consider this issue and finally makes > deadlock. So this patch fixes this problem. > > Signed-off-by: Kim Kyuwon <[email protected]> > Signed-off-by: Adrian Hunter <[email protected]>
Sounds like there's no rush to get this into mainline until during the next merge window as we're still missing most of the 24xx and 34xx PM code. Acked-by: Tony Lindgren <[email protected]> > --- > > > > > Here is Kim Kyuwon's patch without the 'host is never null in suspend / > resume' > assumption, and leaving the issue of SDBP for later. > > > > > > > drivers/mmc/host/omap_hsmmc.c | 55 +++++++++++++++++++++++----------------- > 1 files changed, 32 insertions(+), 23 deletions(-) > > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c > index a631c81..1047cb5 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -56,6 +56,7 @@ > #define SDVS18 (0x5 << 9) > #define SDVS30 (0x6 << 9) > #define SDVS33 (0x7 << 9) > +#define SDVS_MASK 0x00000E00 > #define SDVSCLR 0xFFFFF1FF > #define SDVSDET 0x00000400 > #define AUTOIDLE 0x1 > @@ -891,6 +892,34 @@ static int omap_hsmmc_get_ro(struct mmc_host *mmc) > return pdata->slots[0].get_ro(host->dev, 0); > } > > +static void omap_hsmmc_init(struct mmc_omap_host *host) > +{ > + u32 hctl, capa, value; > + > + /* Only MMC1 supports 3.0V */ > + if (host->id == OMAP_MMC1_DEVID) { > + hctl = SDVS30; > + capa = VS30 | VS18; > + } else { > + hctl = SDVS18; > + capa = VS18; > + } > + > + value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK; > + OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl); > + > + value = OMAP_HSMMC_READ(host->base, CAPA); > + OMAP_HSMMC_WRITE(host->base, CAPA, value | capa); > + > + /* Set the controller to AUTO IDLE mode */ > + value = OMAP_HSMMC_READ(host->base, SYSCONFIG); > + OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE); > + > + /* Set SD bus power bit */ > + value = OMAP_HSMMC_READ(host->base, HCTL); > + OMAP_HSMMC_WRITE(host->base, HCTL, value | SDBP); > +} > + > static struct mmc_host_ops mmc_omap_ops = { > .request = omap_mmc_request, > .set_ios = omap_mmc_set_ios, > @@ -906,7 +935,6 @@ static int __init omap_mmc_probe(struct platform_device > *pdev) > struct mmc_omap_host *host = NULL; > struct resource *res; > int ret = 0, irq; > - u32 hctl, capa; > > if (pdata == NULL) { > dev_err(&pdev->dev, "Platform Data is missing\n"); > @@ -1011,28 +1039,7 @@ static int __init omap_mmc_probe(struct > platform_device *pdev) > if (pdata->slots[host->slot_id].wires >= 4) > mmc->caps |= MMC_CAP_4_BIT_DATA; > > - /* Only MMC1 supports 3.0V */ > - if (host->id == OMAP_MMC1_DEVID) { > - hctl = SDVS30; > - capa = VS30 | VS18; > - } else { > - hctl = SDVS18; > - capa = VS18; > - } > - > - OMAP_HSMMC_WRITE(host->base, HCTL, > - OMAP_HSMMC_READ(host->base, HCTL) | hctl); > - > - OMAP_HSMMC_WRITE(host->base, CAPA, > - OMAP_HSMMC_READ(host->base, CAPA) | capa); > - > - /* Set the controller to AUTO IDLE mode */ > - OMAP_HSMMC_WRITE(host->base, SYSCONFIG, > - OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE); > - > - /* Set SD bus power bit */ > - OMAP_HSMMC_WRITE(host->base, HCTL, > - OMAP_HSMMC_READ(host->base, HCTL) | SDBP); > + omap_hsmmc_init(host); > > /* Request IRQ for MMC operations */ > ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED, > @@ -1222,6 +1229,8 @@ static int omap_mmc_resume(struct platform_device *pdev) > dev_dbg(mmc_dev(host->mmc), > "Enabling debounce clk failed\n"); > > + omap_hsmmc_init(host); > + > if (host->pdata->resume) { > ret = host->pdata->resume(&pdev->dev, host->slot_id); > if (ret) > -- > 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
