mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 17:18:59 +00:00
32 lines
1.1 KiB
Diff
32 lines
1.1 KiB
Diff
|
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 */
|