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authorGrazvydas Ignotas <notasas@gmail.com>2012-03-16 14:49:54 +0200
committerPaul Walmsley <paul@pwsan.com>2012-04-04 08:32:04 -0600
commit26c547fd130aae7480523a3af3f1df2ef1144743 (patch)
tree1464aa01c8c08d7bfebf83d0bbf8e8a93961deee /arch/arm
parentdd775ae2549217d3ae09363e3edb305d0fa19928 (diff)
downloadop-kernel-dev-26c547fd130aae7480523a3af3f1df2ef1144743.zip
op-kernel-dev-26c547fd130aae7480523a3af3f1df2ef1144743.tar.gz
ARM: OMAP3xxx: HSMMC: avoid erratum workaround when transceiver is attached
If transceiver is attached to a MMC host of ES2.1 OMAP35xx, it seems 2.1.1.128 erratum doesn't apply and there is no data corruption, probably because of different signal timing. The workaround for this erratum disables multiblock reads, which causes dramatic loss of performance (over 75% slower), so avoid it when transceiver is present. Cc: Paul Walmsley <paul@pwsan.com> Signed-off-by: Grazvydas Ignotas <notasas@gmail.com> [paul@pwsan.com: edited commit message slightly] Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-omap2/hsmmc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index 100db62..b0268ea 100644
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -506,6 +506,13 @@ static void __init omap_hsmmc_init_one(struct omap2_hsmmc_info *hsmmcinfo,
if (oh->dev_attr != NULL) {
mmc_dev_attr = oh->dev_attr;
mmc_data->controller_flags = mmc_dev_attr->flags;
+ /*
+ * erratum 2.1.1.128 doesn't apply if board has
+ * a transceiver is attached
+ */
+ if (hsmmcinfo->transceiver)
+ mmc_data->controller_flags &=
+ ~OMAP_HSMMC_BROKEN_MULTIBLOCK_READ;
}
pdev = platform_device_alloc(name, ctrl_nr - 1);
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