diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0167-mmc-bcm2835-mmc-Support-underclocking.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0167-mmc-bcm2835-mmc-Support-underclocking.patch | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0167-mmc-bcm2835-mmc-Support-underclocking.patch b/target/linux/brcm2708/patches-4.14/950-0167-mmc-bcm2835-mmc-Support-underclocking.patch new file mode 100644 index 0000000000..c0b18c7f47 --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0167-mmc-bcm2835-mmc-Support-underclocking.patch @@ -0,0 +1,31 @@ +From 9cd69b8f61edc246563741cd11d01fa911cd7e91 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Mon, 22 Jan 2018 12:22:01 +0000 +Subject: [PATCH 167/454] mmc: bcm2835-mmc: Support underclocking + +Support underclocking of the SD bus using the max-frequency DT property +(which currently has no DT parameter). The sd_overclock parameter +already provides another way to achieve the same thing which should be +equivalent in end result, but it is a bug not to support max-frequency +as well. + +See: https://github.com/raspberrypi/linux/issues/2350 + +Signed-off-by: Phil Elwell <phil@raspberrypi.org> +--- + drivers/mmc/host/bcm2835-mmc.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/drivers/mmc/host/bcm2835-mmc.c ++++ b/drivers/mmc/host/bcm2835-mmc.c +@@ -1310,8 +1310,8 @@ static int bcm2835_mmc_add_host(struct b + + host->clk_mul = 0; + +- mmc->f_max = host->max_clk; +- mmc->f_max = host->max_clk; ++ if (!mmc->f_max || mmc->f_max > host->max_clk) ++ mmc->f_max = host->max_clk; + mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300; + + /* SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK */ |