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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>
This commit is contained in:
Grazvydas Ignotas 2012-03-16 14:49:54 +02:00 committed by Paul Walmsley
parent dd775ae254
commit 26c547fd13
1 changed files with 7 additions and 0 deletions
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7
arch/arm/mach-omap2/hsmmc.c
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@ -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);