Difuse/u-boot
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

mmc: tmio: Keep generating clock when clock are enabled

Browse source 
The TMIO core has a feature where it can automatically disable clock output
when the bus is not in use. While this is useful, it also interferes with
switching the bus to 1.8V and other background tasks of the SD/MMC cards,
which require clock to be enabled.

This patch respects the mmc->clk_disable and only disables the clock when
the MMC core requests it. Otherwise the clock are continuously generated
on the bus.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Marek Vasut 2018-06-13 08:02:55 +02:00 committed by Marek Vasut
parent 6f8f20f85d
commit 59d529afdc
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/tmio-common.c
View file

@ -612,10 +612,16 @@ static void tmio_sd_set_clk_rate(struct tmio_sd_priv *priv,
tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);
tmp &= ~TMIO_SD_CLKCTL_DIV_MASK;
tmp |= val | TMIO_SD_CLKCTL_OFFEN;
tmp |= val;
tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);
tmp |= TMIO_SD_CLKCTL_SCLKEN;
if (!mmc->clk_disable) {
tmp &= ~TMIO_SD_CLKCTL_OFFEN;
tmp |= TMIO_SD_CLKCTL_SCLKEN;
} else {
tmp |= TMIO_SD_CLKCTL_OFFEN;
tmp &= ~TMIO_SD_CLKCTL_SCLKEN;
}
tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);
udelay(1000);