This is a note to let you know that I've just added the patch titled
mmc: sdhci-sprd: Disable CLK_AUTO when the clock is less than 400K
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-sdhci-sprd-disable-clk_auto-when-the-clock-is-less-than-400k.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ff874dbc4f868af128b412a9bd92637103cf11d7 Mon Sep 17 00:00:00 2001
From: Wenchao Chen <wenchao.chen@xxxxxxxxxx>
Date: Wed, 7 Dec 2022 13:19:09 +0800
Subject: mmc: sdhci-sprd: Disable CLK_AUTO when the clock is less than 400K
From: Wenchao Chen <wenchao.chen@xxxxxxxxxx>
commit ff874dbc4f868af128b412a9bd92637103cf11d7 upstream.
When the clock is less than 400K, some SD cards fail to initialize
because CLK_AUTO is enabled.
Fixes: fb8bd90f83c4 ("mmc: sdhci-sprd: Add Spreadtrum's initial host controller")
Signed-off-by: Wenchao Chen <wenchao.chen@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20221207051909.32126-1-wenchao.chen@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-sprd.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/mmc/host/sdhci-sprd.c
+++ b/drivers/mmc/host/sdhci-sprd.c
@@ -223,13 +223,15 @@ static inline void _sdhci_sprd_set_clock
div = ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
sdhci_enable_clk(host, div);
- /* enable auto gate sdhc_enable_auto_gate */
- val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
- mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN |
- SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
- if (mask != (val & mask)) {
- val |= mask;
- sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
+ /* Enable CLK_AUTO when the clock is greater than 400K. */
+ if (clk > 400000) {
+ val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
+ mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN |
+ SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
+ if (mask != (val & mask)) {
+ val |= mask;
+ sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
+ }
}
}
Patches currently in stable-queue which might be from wenchao.chen@xxxxxxxxxx are
queue-5.4/mmc-sdhci-sprd-disable-clk_auto-when-the-clock-is-less-than-400k.patch
