diff options
| author |   Paul Walmsley <paul@pwsan.com> | 2011-10-06 14:50:35 -0600 |
|---|---|---|
| committer |   Chris Ball <cjb@laptop.org> | 2011-10-27 09:11:28 -0400 |
| commit | 9b68256cdef75204aa8a4583aa79dd7c081796b3 (patch) | |
| tree | 8b0d514421193b11ebfb98e99bde76b81bfb00f5 | |
| parent | mmc: core: add workaround for controllers with broken multiblock reads (diff) | |
| download | linux-dev-9b68256cdef75204aa8a4583aa79dd7c081796b3.tar.xz linux-dev-9b68256cdef75204aa8a4583aa79dd7c081796b3.zip | |
mmc: omap_hsmmc: if multiblock reads are broken, disable them
When device data indicates that multiple block reads are not supported
on a given HSMMC controller instance, log a message to the console, and
pass the appropriate MMC capability flag to the MMC core.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Dave Hylands <dhylands@gmail.com>
Tested-by: Steve Sakoman <sakoman@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
| -rw-r--r-- | arch/arm/plat-omap/include/plat/mmc.h | 19 | ||||
| -rw-r--r-- | drivers/mmc/host/omap_hsmmc.c | 4 |
2 files changed, 22 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h index c7b874186c27..94cf70afb236 100644 --- a/arch/arm/plat-omap/include/plat/mmc.h +++ b/arch/arm/plat-omap/include/plat/mmc.h @@ -31,7 +31,24 @@ #define OMAP_MMC_MAX_SLOTS 2 -#define OMAP_HSMMC_SUPPORTS_DUAL_VOLT BIT(1) +/* + * struct omap_mmc_dev_attr.flags possibilities + * + * OMAP_HSMMC_SUPPORTS_DUAL_VOLT: Some HSMMC controller instances can + * operate with either 1.8Vdc or 3.0Vdc card voltages; this flag + * should be set if this is the case. See for example Section 22.5.3 + * "MMC/SD/SDIO1 Bus Voltage Selection" of the OMAP34xx Multimedia + * Device Silicon Revision 3.1.x Revision ZR (July 2011) (SWPU223R). + * + * OMAP_HSMMC_BROKEN_MULTIBLOCK_READ: Multiple-block read transfers + * don't work correctly on some MMC controller instances on some + * OMAP3 SoCs; this flag should be set if this is the case. See + * for example Advisory 2.1.1.128 "MMC: Multiple Block Read + * Operation Issue" in _OMAP3530/3525/3515/3503 Silicon Errata_ + * Revision F (October 2010) (SPRZ278F). + */ +#define OMAP_HSMMC_SUPPORTS_DUAL_VOLT BIT(0) +#define OMAP_HSMMC_BROKEN_MULTIBLOCK_READ BIT(1) struct omap_mmc_dev_attr { u8 flags; diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index bb334be562d7..e8ff12396680 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -1942,6 +1942,10 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev) omap_hsmmc_context_save(host); mmc->caps |= MMC_CAP_DISABLE; + if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) { + dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n"); + mmc->caps2 |= MMC_CAP2_NO_MULTI_READ; + } pm_runtime_enable(host->dev); pm_runtime_get_sync(host->dev); |