From f6549c85410668e73503221ce6147d049cc6251d Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Sat, 17 Mar 2018 22:49:36 +0000
Subject: [PATCH] mmc: avoid division by zero in meson_mmc_config_clock
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>
---
drivers/mmc/meson_gx_mmc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/meson_gx_mmc.c b/drivers/mmc/meson_gx_mmc.c
index a2cd5d3a44..454593eec4 100644
--- a/drivers/mmc/meson_gx_mmc.c
+++ b/drivers/mmc/meson_gx_mmc.c
@@ -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;
--
2.39.5