linux-kernel - [PATCH 5.4 020/255] mmc: sdhci-sprd: Fix minimum clock limit

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Message-Id: <20221024113003.109807512@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:28:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wenchao Chen <wenchao.chen@...soc.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.4 020/255] mmc: sdhci-sprd: Fix minimum clock limit

From: Wenchao Chen <wenchao.chen@...soc.com>

commit 6e141772e6465f937458b35ddcfd0a981b6f5280 upstream.

The Spreadtrum controller supports 100KHz minimal clock rate, which means
that the current value 400KHz is wrong.

Unfortunately this has also lead to fail to initialize some cards, which
are allowed to require 100KHz to work. So, let's fix the problem by
changing the minimal supported clock rate to 100KHz.

Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Fixes: fb8bd90f83c4 ("mmc: sdhci-sprd: Add Spreadtrum's initial host controller")
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20221011104935.10980-1-wenchao.chen666@gmail.com
[Ulf: Clarified to commit-message]
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/host/sdhci-sprd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/host/sdhci-sprd.c
+++ b/drivers/mmc/host/sdhci-sprd.c
@@ -295,7 +295,7 @@ static unsigned int sdhci_sprd_get_max_c
 
 static unsigned int sdhci_sprd_get_min_clock(struct sdhci_host *host)
 {
-	return 400000;
+	return 100000;
 }
 
 static void sdhci_sprd_set_uhs_signaling(struct sdhci_host *host,