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mmc: avoid division by zero in meson_mmc_config_clock

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The Odroid C2 fails to read from mmc with U-Boot v2018.03.
The change avoids a division by zero.

The fix was suggested by Jaehoon in
https://lists.denx.de/pipermail/u-boot/2018-January/318577.html

Reported-by: Vagrant Cascadian <vagrant@debian.org>
Suggested-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Tested-by: Vagrant Cascadian <vagrant@debian.org>
This commit is contained in:
Heinrich Schuchardt 2018-03-17 22:49:36 +00:00 committed by Tom Rini
parent 275d80a4c2
commit f6549c8541
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/meson_gx_mmc.c
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@ -35,6 +35,9 @@ static void meson_mmc_config_clock(struct mmc *mmc)
uint32_t meson_mmc_clk = 0;
unsigned int clk, clk_src, clk_div;
if (!mmc->clock)
return;
/* 1GHz / CLK_MAX_DIV = 15,9 MHz */
if (mmc->clock > 16000000) {
clk = SD_EMMC_CLKSRC_DIV2;