[PATCH 3/3] mmc: sunxi: use controller automatic clock gating.
From: Michal Suchanek <hidden>
Date: 2015-08-12 12:23:11
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
When core does not set the MMC_QUIRK_BROKEN_CLK_GATING flag enable automatic hardware controlled clock gating on the mmc interface. Signed-off-by: Michal Suchanek <redacted> --- drivers/mmc/host/sunxi-mmc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index f808a02..443cab5 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c@@ -601,8 +601,13 @@ static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en) rval = mmc_readl(host, REG_CLKCR); rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON); - if (oclk_en) + if (oclk_en) { rval |= SDXC_CARD_CLOCK_ON; + if (!host->mmc->card || + !(host->mmc->card->quirks & MMC_QUIRK_BROKEN_CLK_GATING)) + + rval |= SDXC_LOW_POWER_ON; + } start = jiffies; end = start + msecs_to_jiffies(750);
--
2.1.4