linux-kernel - [PATCH v4 6/9] mmc: sdhci-st: Update the quirks for this controller.

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Message-Id: <1428656311-2605-7-git-send-email-peter.griffin@linaro.org>
Date:	Fri, 10 Apr 2015 09:58:28 +0100
From:	Peter Griffin <peter.griffin@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	ulf.hansson@...aro.org, maxime.coquelin@...com,
	patrice.chotard@...com, srinivas.kandagatla@...il.com
Cc:	peter.griffin@...aro.org, lee.jones@...aro.org,
	devicetree@...r.kernel.org, linux-mmc@...r.kernel.org,
	peppe.cavallaro@...com
Subject: [PATCH v4 6/9] mmc: sdhci-st: Update the quirks for this controller.

Some additional quirks need to be enabled now we support UHS
modes. This avoids some spurious warnings like

"Got data interrupt 0x00000002 even though no data operation was in progress"

Testing on stih410-b2120 board achieves the following speeds
with HS200 eMMC card.

max-frequency = 200Mhz
/dev/mmcblk0p1:
 Timing buffered disk reads: 270 MB in  3.02 seconds =  89.54 MB/sec

max-frequency = 100Mhz
root@...ian-armhf:~# hdparm -t /dev/mmcblk0p1
/dev/mmcblk0p1:
 Timing buffered disk reads: 210 MB in  3.00 seconds =  70.00 MB/sec

max-frequency = 50Mhz
root@...ian-armhf:~# hdparm -t /dev/mmcblk0p1
/dev/mmcblk0p1:
 Timing buffered disk reads: 118 MB in  3.00 seconds =  39.28 MB/sec

This is better than the 3.10 kernel which achieves 77.59 MB/sec
at 200Mhz clock (same board/soc/eMMC).

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
Acked-by: Maxime Coquelin <maxime.coquelin@...com>
---
 drivers/mmc/host/sdhci-st.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
index 2ce842b..751452b 100644
--- a/drivers/mmc/host/sdhci-st.c
+++ b/drivers/mmc/host/sdhci-st.c
@@ -340,7 +340,10 @@ static const struct sdhci_ops sdhci_st_ops = {
 static const struct sdhci_pltfm_data sdhci_st_pdata = {
 	.ops = &sdhci_st_ops,
 	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
-	    SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+		SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		SDHCI_QUIRK_NO_HISPD_BIT,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		SDHCI_QUIRK2_STOP_WITH_TC,
 };
 
 
-- 
1.9.1

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