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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 */
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