From ce27c60256bb3f03d23b2b14a9b362e568d9e964 Mon Sep 17 00:00:00 2001 From: Grazvydas Ignotas Date: Mon, 19 Mar 2012 15:41:47 +0200 Subject: [PATCH] mmc: omap: follow TRM procedure to power on cards Accorting to OMAP3 TRM, PBIASLITEPWRDNZ bits must be cleared while MMC power supply is being enabled and is ramping up. It doesn't say what happens if this procedure is violated, but better not to risk here and do things as required. Signed-off-by: Grazvydas Ignotas --- drivers/mmc/omap_hsmmc.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c index 368433590e9..547acd50c11 100644 --- a/drivers/mmc/omap_hsmmc.c +++ b/drivers/mmc/omap_hsmmc.c @@ -62,15 +62,21 @@ static void omap4_vmmc_pbias_config(struct mmc *mmc) unsigned char mmc_board_init(struct mmc *mmc) { -#if defined(CONFIG_TWL4030_POWER) - twl4030_power_mmc_init(); -#endif - #if defined(CONFIG_OMAP34XX) t2_t *t2_base = (t2_t *)T2_BASE; struct prcm *prcm_base = (struct prcm *)PRCM_BASE; + u32 pbias_lite; - writel(readl(&t2_base->pbias_lite) | PBIASLITEPWRDNZ1 | + pbias_lite = readl(&t2_base->pbias_lite); + pbias_lite &= ~(PBIASLITEPWRDNZ1 | PBIASLITEPWRDNZ0); + writel(pbias_lite, &t2_base->pbias_lite); +#endif +#if defined(CONFIG_TWL4030_POWER) + twl4030_power_mmc_init(); + mdelay(100); /* ramp-up delay from Linux code */ +#endif +#if defined(CONFIG_OMAP34XX) + writel(pbias_lite | PBIASLITEPWRDNZ1 | PBIASSPEEDCTRL0 | PBIASLITEPWRDNZ0, &t2_base->pbias_lite); -- 2.39.5