[PATCH] drivers: mmc: sdhci: update max frequency only if undefined
f_max parameter of mmc structure is updated unconditionally.
If dt property max-frequency is assigned, this update is
overwriting the dt property value which is undesired.
Signed-off-by: Suneel Garapati suneel.garap...@xilinx.com
---
drivers/mmc/host/sdhci.c | 5 -
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index bc14452..c2917d5 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3047,7 +3047,10 @@ int sdhci_add_host(struct sdhci_host *host)
* Set host parameters.
*/
mmc-ops = sdhci_ops;
- mmc-f_max = host-max_clk;
+
+ if(!mmc-f_max)
+ mmc-f_max = host-max_clk;
+
if (host-ops-get_min_clock)
mmc-f_min = host-ops-get_min_clock(host);
else if (host-version = SDHCI_SPEC_300) {
--
2.1.2
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[PATCH 0/2] adds quirk SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN
This quirk will support controllers whose clock divider zero is broken and if the calculation results to zero, forcing the divider to next value. This is tested on zynq ep108 and enables support for UHS cards where formatting cards fail. Added few quirks to arasan platform driver as the base clock reported in registers is broken and preset values are broken too and tested on zynq ep108 platform. max-frequency devicetree parameter is alternative to get upper limit . Suneel Garapati (2): drivers: mmc: add quirk SDHCI_QUIRK_CLOCK_DIV_ZERO_BROKEN drivers: mmc: add quirks for broken clock base drivers/mmc/host/sdhci-of-arasan.c | 3 +++ drivers/mmc/host/sdhci.c | 4 drivers/mmc/host/sdhci.h | 2 ++ 3 files changed, 9 insertions(+) -- 2.1.2 -- To unsubscribe from this list: send the line unsubscribe linux-mmc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH 2/2] drivers: mmc: add quirks for broken clock base
adding SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,SDHCI_QUIRK2_PRESET_VALUE_BROKEN
flags for arasan sdhc.
Signed-off-by: Suneel Garapati suneel.garap...@xilinx.com
---
drivers/mmc/host/sdhci-of-arasan.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c
b/drivers/mmc/host/sdhci-of-arasan.c
index 21c0c08..ef5a7d2 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -63,6 +63,9 @@ static struct sdhci_ops sdhci_arasan_ops = {
static struct sdhci_pltfm_data sdhci_arasan_pdata = {
.ops = sdhci_arasan_ops,
+ .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+ .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+ SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
};
#ifdef CONFIG_PM_SLEEP
--
2.1.2
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[PATCH 1/2] drivers: mmc: add quirk SDHCI_QUIRK_CLOCK_DIV_ZERO_BROKEN
adds quirk for controllers whose clock divider zero is broken,
sdhci_set_clock function will incorporate this modification.
Signed-off-by: Suneel Garapati suneel.garap...@xilinx.com
---
drivers/mmc/host/sdhci.c | 4
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 1b4861d..087327e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1210,6 +1210,10 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned
int clock)
}
real_div = div;
div = 1;
+ if ((host-quirks2 SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
+!div host-max_clk = 2500) {
+ div = 1;
+ }
}
} else {
/* Version 2.00 divisors must be a power of 2. */
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 5521d29..67046ca 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -409,6 +409,8 @@ struct sdhci_host {
#define SDHCI_QUIRK2_SUPPORT_SINGLE(113)
/* Controller broken with using ACMD23 */
#define SDHCI_QUIRK2_ACMD23_BROKEN (114)
+/* Broken Clock divider zero in controller */
+#define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN (115)
int irq;/* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
2.1.2
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