From b1e725f2c6e2d8f9855a0b4cba508a2abe748b4d Mon Sep 17 00:00:00 2001 From: Grazvydas Ignotas Date: Mon, 19 Mar 2012 03:50:53 +0000 Subject: [PATCH] mmc: omap: follow TRM procedure to power on cards According to OMAP3 TRM, PBIASLITEPWRDNZ bits must be cleared while MMC power supply is being enabled and is ramping up (those bits might be left set by the previous bootloader). 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 Acked-by: Tom Rini --- 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 2400db2f35..2b12929576 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