The patch titled
sdhci: support 10 bit divided clock Mode for spec 3.0
has been added to the -mm tree. Its filename is
sdhci-support-10-bit-divided-clock-mode-for-spec-30.patch
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------------------------------------------------------
Subject: sdhci: support 10 bit divided clock Mode for spec 3.0
From: Zhangfei Gao <zgao6@xxxxxxxxxxx>
Signed-off-by: Zhangfei Gao <zgao6@xxxxxxxxxxx>
Reviewed-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Michal Miroslaw <mirqus@xxxxxxxxx>
Acked-by: David Vrabel <david.vrabel@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 22 +++++++++++++++++-----
drivers/mmc/host/sdhci.h | 5 +++++
2 files changed, 22 insertions(+), 5 deletions(-)
diff -puN drivers/mmc/host/sdhci.c~sdhci-support-10-bit-divided-clock-mode-for-spec-30 drivers/mmc/host/sdhci.c
--- a/drivers/mmc/host/sdhci.c~sdhci-support-10-bit-divided-clock-mode-for-spec-30
+++ a/drivers/mmc/host/sdhci.c
@@ -1001,13 +1001,25 @@ static void sdhci_set_clock(struct sdhci
if (clock == 0)
goto out;
- for (div = 1;div < 256;div *= 2) {
- if ((host->max_clk / div) <= clock)
- break;
+ if (host->version >= SDHCI_SPEC_300) {
+ if(host->max_clk <= clock)
+ div = 1;
+ else {
+ for (div = 2; div < 2046; div += 2) {
+ if ((host->max_clk / div) <= clock)
+ break;
+ }
+ }
+ } else {
+ for (div = 1;div < 256;div *= 2) {
+ if ((host->max_clk / div) <= clock)
+ break;
+ }
}
div >>= 1;
- clk = div << SDHCI_DIVIDER_SHIFT;
+ clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
+ clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) << SDHCI_DIVIDER_HI_SHIFT;
clk |= SDHCI_CLOCK_INT_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
@@ -1708,7 +1720,7 @@ int sdhci_add_host(struct sdhci_host *ho
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
host->version = (host->version & SDHCI_SPEC_VER_MASK)
>> SDHCI_SPEC_VER_SHIFT;
- if (host->version > SDHCI_SPEC_200) {
+ if (host->version > SDHCI_SPEC_300) {
printk(KERN_ERR "%s: Unknown controller version (%d). "
"You may experience problems.\n", mmc_hostname(mmc),
host->version);
diff -puN drivers/mmc/host/sdhci.h~sdhci-support-10-bit-divided-clock-mode-for-spec-30 drivers/mmc/host/sdhci.h
--- a/drivers/mmc/host/sdhci.h~sdhci-support-10-bit-divided-clock-mode-for-spec-30
+++ a/drivers/mmc/host/sdhci.h
@@ -86,6 +86,10 @@
#define SDHCI_CLOCK_CONTROL 0x2C
#define SDHCI_DIVIDER_SHIFT 8
+#define SDHCI_DIVIDER_HI_SHIFT 6
+#define SDHCI_DIV_MASK 0xFF
+#define SDHCI_DIV_MASK_LEN 8
+#define SDHCI_DIV_HI_MASK 0x300
#define SDHCI_CLOCK_CARD_EN 0x0004
#define SDHCI_CLOCK_INT_STABLE 0x0002
#define SDHCI_CLOCK_INT_EN 0x0001
@@ -178,6 +182,7 @@
#define SDHCI_SPEC_VER_SHIFT 0
#define SDHCI_SPEC_100 0
#define SDHCI_SPEC_200 1
+#define SDHCI_SPEC_300 2
struct sdhci_ops;
_
Patches currently in -mm which might be from zgao6@xxxxxxxxxxx are
sdhci-support-mmc_cap_mmc_highspeed.patch
sdhci-support-10-bit-divided-clock-mode-for-spec-30.patch
sdhci-support-10-bit-divided-clock-mode-for-spec-30-checkpatch-fixes.patch
sdhci-base-clock-freqency-change-in-spec-30.patch
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