hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

mmc: tmio: don't wait on R-Car2+ when handling the clock 

Our hardware engineers confirmed that it is unnecessary to wait when
turning the clock on/off. The documentation was a tad vague, so we
used to play safe.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2017-06-28 17:23:11 +02:00 committed by Ulf Hansson
parent 5af02d3209
commit 01ffb1ae84
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/mmc/host/tmio_mmc_core.c
View File

@ -207,7 +207,10 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
{ {
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(host->pdata->flags & TMIO_MMC_MIN_RCAR2 ? 1 : 10);
/* HW engineers overrode docs: no sleep needed on R-Car2+ */
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
msleep(10);
if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) { if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100); sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
@ -224,7 +227,10 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(host->pdata->flags & TMIO_MMC_MIN_RCAR2 ? 5 : 10);
/* HW engineers overrode docs: no sleep needed on R-Car2+ */
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
msleep(10);
} }
static void tmio_mmc_set_clock(struct tmio_mmc_host *host, static void tmio_mmc_set_clock(struct tmio_mmc_host *host,