[PATCH v3 2/13] mmc: sunxi: Gate the clock when rate is 0
From: Maxime Ripard <hidden>
Date: 2017-01-16 16:57:11
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
The MMC core assumes that the code will gate the clock when the bus frequency is set to 0, which we've been ignoring so far. Handle that. Signed-off-by: Maxime Ripard <redacted> --- drivers/mmc/host/sunxi-mmc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index ab4324e6eb74..019f95e8e7c5 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c@@ -765,6 +765,9 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, if (ret) return ret; + if (!ios->clock) + return 0; + /* 8 bit DDR requires a higher module clock */ if (ios->timing == MMC_TIMING_MMC_DDR52 && ios->bus_width == MMC_BUS_WIDTH_8)
@@ -882,7 +885,7 @@ static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) mmc_writel(host, REG_GCTRL, rval); /* set up clock */ - if (ios->clock && ios->power_mode) { + if (ios->power_mode) { host->ferror = sunxi_mmc_clk_set_rate(host, ios); /* Android code had a usleep_range(50000, 55000); here */ }
--
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