>From e543f7849ab668fa0cbabc048e37e090e7b6f167 Mon Sep 17 00:00:00 2001 From: Adrian Hunter <[email protected]> Date: Thu, 12 Mar 2009 17:08:26 +0200 Subject: [PATCH] OMAP: HSMMC: Wait for SDBP
It is necessary to wait for bus power before sending any commands. Signed-off-by: Adrian Hunter <[email protected]> --- drivers/mmc/host/omap_hsmmc.c | 20 +++++++++++++++----- 1 files changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 91381f4..2f444c8 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -546,6 +546,19 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id) return IRQ_HANDLED; } +static void set_sd_bus_power(struct mmc_omap_host *host) +{ + unsigned long i; + + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) | SDBP); + for (i = 0; i < loops_per_jiffy; i++) { + if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP) + break; + cpu_relax(); + } +} + /* * Switch MMC interface voltage ... only relevant for MMC1. * @@ -602,9 +615,7 @@ static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd) reg_val |= SDVS30; OMAP_HSMMC_WRITE(host->base, HCTL, reg_val); - - OMAP_HSMMC_WRITE(host->base, HCTL, - OMAP_HSMMC_READ(host->base, HCTL) | SDBP); + set_sd_bus_power(host); return 0; err: @@ -997,8 +1008,7 @@ static void omap_hsmmc_init(struct mmc_omap_host *host) 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); + set_sd_bus_power(host); } static struct mmc_host_ops mmc_omap_ops = { -- 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
