From: Anton Vorontsov <avoront...@ru.mvista.com>
eSDHC fails to recognize some SDHS cards, throwing timeout errors:
mmc0: error -110 whilst initialising SD card
That's because we calculate timeout value in a wrong way: on eSDHC hosts
the timeout clock is derivied from the SD clock, which is set dynamically.
As David Vrabel suggested, deriving timeout clock from SD clock is a
common scheme, so let's implement DATA_TIMEOUT_USES_SDCLK quirk and use it
for eSDHC hosts.
Also, from now on we don't need esdhc_get_timeout_clock() callback, so
remove it.
Signed-off-by: Anton Vorontsov <avoront...@ru.mvista.com>
Cc: Pierre Ossman <pie...@ossman.eu>
Cc: Kumar Gala <ga...@kernel.crashing.org>
Cc: David Vrabel <david.vra...@csr.com>
Cc: Ben Dooks <b...@fluff.org>
Cc: Sascha Hauer <s.ha...@pengutronix.de>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
drivers/mmc/host/sdhci-of.c | 9 +--------
drivers/mmc/host/sdhci.c | 9 +++++++--
drivers/mmc/host/sdhci.h | 2 ++
3 files changed, 10 insertions(+), 10 deletions(-)
diff -puN drivers/mmc/host/sdhci-of.c~sdhci-of-fix-high-speed-cards-recognition
drivers/mmc/host/sdhci-of.c
--- a/drivers/mmc/host/sdhci-of.c~sdhci-of-fix-high-speed-cards-recognition
+++ a/drivers/mmc/host/sdhci-of.c
@@ -172,19 +172,13 @@ static unsigned int esdhc_get_min_clock(
return of_host->clock / 256 / 16;
}
-static unsigned int esdhc_get_timeout_clock(struct sdhci_host *host)
-{
- struct sdhci_of_host *of_host = sdhci_priv(host);
-
- return of_host->clock / 1000;
-}
-
static struct sdhci_of_data sdhci_esdhc = {
.quirks = SDHCI_QUIRK_FORCE_BLK_SZ_2048 |
SDHCI_QUIRK_BROKEN_CARD_DETECTION |
SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
SDHCI_QUIRK_NO_BUSY_IRQ |
SDHCI_QUIRK_NONSTANDARD_CLOCK |
+ SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
SDHCI_QUIRK_PIO_NEEDS_DELAY |
SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET |
SDHCI_QUIRK_NO_CARD_NO_RESET,
@@ -199,7 +193,6 @@ static struct sdhci_of_data sdhci_esdhc
.enable_dma = esdhc_enable_dma,
.get_max_clock = esdhc_get_max_clock,
.get_min_clock = esdhc_get_min_clock,
- .get_timeout_clock = esdhc_get_timeout_clock,
},
};
diff -puN drivers/mmc/host/sdhci.c~sdhci-of-fix-high-speed-cards-recognition
drivers/mmc/host/sdhci.c
--- a/drivers/mmc/host/sdhci.c~sdhci-of-fix-high-speed-cards-recognition
+++ a/drivers/mmc/host/sdhci.c
@@ -591,6 +591,9 @@ static u8 sdhci_calc_timeout(struct sdhc
target_timeout = data->timeout_ns / 1000 +
data->timeout_clks / host->clock;
+ if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)
+ host->timeout_clk = host->clock / 1000;
+
/*
* Figure out needed cycles.
* We do this in steps in order to fit inside a 32 bit int.
@@ -1757,13 +1760,15 @@ int sdhci_add_host(struct sdhci_host *ho
host->timeout_clk =
(caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
if (host->timeout_clk == 0) {
- if (!host->ops->get_timeout_clock) {
+ if (host->ops->get_timeout_clock) {
+ host->timeout_clk = host->ops->get_timeout_clock(host);
+ } else if (!(host->quirks &
+ SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
printk(KERN_ERR
"%s: Hardware doesn't specify timeout clock "
"frequency.\n", mmc_hostname(mmc));
return -ENODEV;
}
- host->timeout_clk = host->ops->get_timeout_clock(host);
}
if (caps & SDHCI_TIMEOUT_CLK_UNIT)
host->timeout_clk *= 1000;
diff -puN drivers/mmc/host/sdhci.h~sdhci-of-fix-high-speed-cards-recognition
drivers/mmc/host/sdhci.h
--- a/drivers/mmc/host/sdhci.h~sdhci-of-fix-high-speed-cards-recognition
+++ a/drivers/mmc/host/sdhci.h
@@ -232,6 +232,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_FORCE_1_BIT_DATA (1<<22)
/* Controller needs 10ms delay between applying power and clock */
#define SDHCI_QUIRK_DELAY_AFTER_POWER (1<<23)
+/* Controller uses SDCLK instead of TMCLK for data timeouts */
+#define SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK (1<<24)
int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
_
--
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