diff options
| author | Hebbar, Gururaja <gururaja.hebbar@ti.com> | 2012-11-19 20:29:58 +0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-12-06 22:54:56 +0400 |
| commit | cd587096c0e2b85a67e77721a753679bac89b394 (patch) | |
| tree | 22ae2292f85cb8d36530535bc087bacdb8889158 /arch/arm/plat-omap | |
| parent | dc7745bd32272a614a6598c05db4510548ef18f2 (diff) | |
| download | linux-cd587096c0e2b85a67e77721a753679bac89b394.tar.xz | |
mmc: omap_hsmmc: Enable HSPE bit for high speed cards
HSMMC IP on AM33xx need a special setting to handle High-speed cards.
Other platforms like TI81xx, OMAP4 may need this as-well. This depends
on the HSMMC IP timing closure done for the high speed cards.
From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation):
The MMC/SD/SDIO output signals can be driven on either falling edge or
rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows
to reach better timing performance, and thus to increase data transfer
frequency.
There are few pre-requisites for enabling the HSPE bit
- Controller should support High-Speed-Enable Bit and
- Controller should not be using DDR Mode and
- Controller should advertise that it supports High Speed in
capabilities register and
- MMC/SD clock coming out of controller > 25MHz
Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'arch/arm/plat-omap')
| -rw-r--r-- | arch/arm/plat-omap/include/plat/mmc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h index 8b4e4f2da2f5..346af5b490be 100644 --- a/arch/arm/plat-omap/include/plat/mmc.h +++ b/arch/arm/plat-omap/include/plat/mmc.h @@ -126,6 +126,7 @@ struct omap_mmc_platform_data { /* we can put the features above into this variable */ #define HSMMC_HAS_PBIAS (1 << 0) #define HSMMC_HAS_UPDATED_RESET (1 << 1) +#define HSMMC_HAS_HSPE_SUPPORT (1 << 2) unsigned features; int switch_pin; /* gpio (card detect) */ |