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authorUlf Hansson <ulf.hansson@linaro.org>2012-10-12 14:07:36 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-10-18 11:06:23 +0100
commit70ac09358cc52f3ddbf73555dc150d486a7133bb (patch)
tree8d210b8a67722192b37b0b7c6b4fa233703efdbf /drivers/mmc
parent06c1a121805d7870abbf037d3ccd9a609a5219f2 (diff)
downloadop-kernel-dev-70ac09358cc52f3ddbf73555dc150d486a7133bb.zip
op-kernel-dev-70ac09358cc52f3ddbf73555dc150d486a7133bb.tar.gz
ARM: 7552/1: mmc: mmci: Switching off HWFC for SDIO depends on MCLK
For writes, HWFC shall be switched off when transfer size <= 8 bytes and when MCLK rate is above 50 MHz. For 50MHz and below it shall be switched off when transfer size < 8 bytes. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Johan Rudholm <johan.rudholm@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/mmci.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 877079e7..cd0fbee 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -664,12 +664,14 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
datactrl |= MCI_ST_DPSM_SDIOEN;
/*
- * The ST Micro variant for SDIO transfer sizes
- * less then 8 bytes should have clock H/W flow
- * control disabled.
+ * The ST Micro variant for SDIO small write transfers
+ * needs to have clock H/W flow control disabled,
+ * otherwise the transfer will not start. The threshold
+ * depends on the rate of MCLK.
*/
- if ((host->size < 8) &&
- (data->flags & MMC_DATA_WRITE))
+ if (data->flags & MMC_DATA_WRITE &&
+ (host->size < 8 ||
+ (host->size <= 8 && host->mclk > 50000000)))
clk = host->clk_reg & ~variant->clkreg_enable;
else
clk = host->clk_reg | variant->clkreg_enable;
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