[PATCH linux dev-5.4 2/2] mmc: sdhci-of-aspeed: Prevent clock divider of zero

[Eddie James]

The Aspeed specification forbids a clock divider of zero, which will be
calculated if the parent clock is equal to the desired clock. Testing
confirmed this broke the host controller.

Signed-off-by: Eddie James <eajames at linux.ibm.com>
---
 drivers/mmc/host/sdhci-of-aspeed.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
index 8962f6664381..5aa72e80cae9 100644
--- a/drivers/mmc/host/sdhci-of-aspeed.c
+++ b/drivers/mmc/host/sdhci-of-aspeed.c
@@ -74,6 +74,10 @@ static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 	}
 	div >>= 1;
 
+	/* Aspeed forbids a clock div of 0 */
+	if (!div)
+		div = 1;
+
 	clk = div << SDHCI_DIVIDER_SHIFT;
 
 	sdhci_enable_clk(host, clk);
-- 
2.24.0