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serial: serial_msm: fail probe if settings clocks fails

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Failure to set the clocks will causes data abort exception when
trying to write to AHB uart registers.
This patch ensures that we don't touch these registers if clock
setting failed.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ramon Fried 2018-05-16 12:13:37 +03:00 committed by Tom Rini
parent ffada23ca7
commit 11d59fe537
1 changed files with 4 additions and 2 deletions
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6
drivers/serial/serial_msm.c
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@ -181,10 +181,12 @@ static int msm_uart_clk_init(struct udevice *dev)
static int msm_serial_probe(struct udevice *dev)
{
int ret;
struct msm_serial_data *priv = dev_get_priv(dev);
msm_uart_clk_init(dev); /* Ignore return value and hope clock was
properly initialized by earlier loaders */
ret = msm_uart_clk_init(dev);
if (ret)
return ret;
if (readl(priv->base + UARTDM_SR) & UARTDM_SR_UART_OVERRUN)
writel(UARTDM_CR_CMD_RESET_ERR, priv->base + UARTDM_CR);