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
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -303,6 +303,9 @@
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..2c4629a8 100644
--- a/arch/arm/plat-omap/include/plat/mmc.h
+++ b/arch/arm/plat-omap/include/plat/mmc.h
@@ -103,6 +103,7 @@
/* 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
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -982,6 +982,17 @@
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();