linux-kernel - [PATCH 5.4 127/138] mmc: sdhci-of-aspeed: Fix clock divider calculation

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Message-Id: <20200727134931.778827641@linuxfoundation.org>
Date:   Mon, 27 Jul 2020 16:05:22 +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, Eddie James <eajames@...ux.ibm.com>,
        Andrew Jeffery <andrew@...id.au>,
        Joel Stanley <joel@....id.au>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.4 127/138] mmc: sdhci-of-aspeed: Fix clock divider calculation

From: Eddie James <eajames@...ux.ibm.com>

commit ebd4050c6144b38098d8eed34df461e5e3fa82a9 upstream.

When calculating the clock divider, start dividing at 2 instead of 1.
The divider is divided by two at the end of the calculation, so starting
at 1 may result in a divider of 0, which shouldn't happen.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
Reviewed-by: Andrew Jeffery <andrew@...id.au>
Acked-by: Joel Stanley <joel@....id.au>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Link: https://lore.kernel.org/r/20200709195706.12741-3-eajames@linux.ibm.com
Cc: stable@...r.kernel.org # v5.4+
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci-of-aspeed.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/host/sdhci-of-aspeed.c
+++ b/drivers/mmc/host/sdhci-of-aspeed.c
@@ -68,7 +68,7 @@ static void aspeed_sdhci_set_clock(struc
 	if (WARN_ON(clock > host->max_clk))
 		clock = host->max_clk;
 
-	for (div = 1; div < 256; div *= 2) {
+	for (div = 2; div < 256; div *= 2) {
 		if ((parent / div) <= clock)
 			break;
 	}