renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-22 12:14:01 +08:00
Code

mmc: dw_mmc: fixed a wrong UHS_REG 16 bit clear

Browse Source 
In the legacy code, driver clear not only UHS_REG 16 bit also 0-15bit.
If we use UHS-1 mode spec card like SDR50, SDR104. UHS_REG 0-15 should
be set by 1 according to slot id. In this case, legacy code can cause
problems.

In particular, UHS_REG consists of DDR_REG[31:16] and VOLT_REG[15:0].
Before adjusting this patch, bit[15:0] is always cleared.

Signed-off-by: Hyeonsu Kim <hyeonsu.kim@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Hyeonsu Kim 2013-02-22 09:32:46 +09:00 committed by Chris Ball
parent 87a74d399a
commit c69042a51e
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/mmc/host/dw_mmc.c
View File

@ -795,9 +795,9 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
/* DDR mode set */
if (ios->timing == MMC_TIMING_UHS_DDR50)
regs |= (0x1 << slot->id) << 16;
regs |= ((0x1 << slot->id) << 16);
else
regs &= ~(0x1 << slot->id) << 16;
regs &= ~((0x1 << slot->id) << 16);
mci_writel(slot->host, UHS_REG, regs);