OMAP4 ES2: HSMMC soft reset change

The omap4 es2 hsmmc has a updated soft reset logic.After the
reset is issued monitor a 0->1 transition first. The reset of
CMD or DATA lines is complete only after a 0->1->0 transition
of SRC or SRD bits.

Signed-off-by: Madhusudhan Chikkature <madhu.cr@ti.com>
Tested-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index eb92b81..df1311d 100644 (file)
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -303,6 +303,9 @@ void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
                else
                        mmc->slots[0].features |= HSMMC_HAS_PBIAS;
 
+               if (cpu_is_omap44xx() && (omap_rev() > OMAP4430_REV_ES1_0))
+                       mmc->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
+
                switch (c->mmc) {
                case 1:
                        if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {

diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h
index 4f819fc..2c4629a 100644 (file)
--- a/arch/arm/plat-omap/include/plat/mmc.h
+++ b/arch/arm/plat-omap/include/plat/mmc.h
@@ -103,6 +103,7 @@ struct omap_mmc_platform_data {
 
                /* we can put the features above into this variable */
 #define HSMMC_HAS_PBIAS                (1 << 0)
+#define HSMMC_HAS_UPDATED_RESET        (1 << 1)
                unsigned features;
 
                int switch_pin;                 /* gpio (card detect) */

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 53f8fa5..69858e7 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -982,6 +982,17 @@ static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
        OMAP_HSMMC_WRITE(host->base, SYSCTL,
                         OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
 
+       /*
+        * OMAP4 ES2 and greater has an updated reset logic.
+        * Monitor a 0->1 transition first
+        */
+       if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
+               while ((!(OMAP_HSMMC_READ(host, SYSCTL) & bit))
+                                       && (i++ < limit))
+                       cpu_relax();
+       }
+       i = 0;
+
        while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
                (i++ < limit))
                cpu_relax();