diff mbox

[RESEND,2/2] mmc: mmci: Switching off HWFC for SDIO depends on MCLK

Message ID 1349885000-22887-2-git-send-email-ulf.hansson@stericsson.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ulf Hansson Oct. 10, 2012, 4:03 p.m. UTC 
From: Ulf Hansson <ulf.hansson@linaro.org>

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>
---
 drivers/mmc/host/mmci.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

Comments

Linus Walleij Oct. 10, 2012, 5:33 p.m. UTC | #1 
On Wed, Oct 10, 2012 at 6:03 PM, Ulf Hansson <ulf.hansson@stericsson.com> wrote:

> From: Ulf Hansson <ulf.hansson@linaro.org>
>
> 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>

Yours,
Linus Walleij
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Johan Rudholm Oct. 11, 2012, 6:50 a.m. UTC | #2 
2012/10/10 Linus Walleij <linus.walleij@linaro.org>:
> On Wed, Oct 10, 2012 at 6:03 PM, Ulf Hansson <ulf.hansson@stericsson.com> wrote:
>
>> From: Ulf Hansson <ulf.hansson@linaro.org>
>>
>> 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>
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diff mbox

Patch

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 877079e..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;