[U-Boot] [RFC Patch] drivers: mmc: omap_hsmmc: Fix IO Buffer on OMAP36XX

[aford173 at gmail.com]

From: Adam Ford <aford173 at gmail.com>

On the OMAP36xx (and 37xx) the CONTROL_WKUP_CTRL register has
a field (bit 6) named GPIO_IO_PWRDNZ.  If 0, the IO buffers which
are related to the MMC are disabled. After the PBIAS is configured,
this bit should be set high to enable the MMC port.

Signed-off-by: Adam Ford <aford173 at gmail.com>

diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
index 0a1ee40..069fd5a 100644
--- a/drivers/mmc/omap_hsmmc.c
+++ b/drivers/mmc/omap_hsmmc.c
@@ -38,6 +38,7 @@
 #include <asm/arch/sys_proto.h>
 #endif
 #include <dm.h>
+#include <asm/arch-omap3/mux.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -115,6 +116,11 @@ static unsigned char mmc_board_init(struct mmc *mmc)
 		PBIASSPEEDCTRL0 | PBIASLITEPWRDNZ0,
 		&t2_base->pbias_lite);
 
+	if (get_cpu_family() == CPU_OMAP36XX)
+		writel(readl(OMAP34XX_CTRL_WKUP_CTRL) |
+				OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ,
+				OMAP34XX_CTRL_WKUP_CTRL);
+
 	writel(readl(&t2_base->devconf0) | MMCSDIO1ADPCLKISEL,
 		&t2_base->devconf0);
 
-- 
2.7.4