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serial: uniphier: flush transmitter before changing hardware settings
Ensure the transmitter is empty when chaining the baudrate or any hardware settings. If a character is remaining in the transmitter, the console will be garbled. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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@ -43,6 +43,10 @@ static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
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divisor = DIV_ROUND_CLOSEST(priv->uartclk, mode_x_div * baudrate);
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/* flush the trasmitter before changing hw setting */
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while (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_TEMT))
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;
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writel(divisor, priv->membase + UNIPHIER_UART_DLR);
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return 0;
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@ -132,6 +136,10 @@ static int uniphier_serial_probe(struct udevice *dev)
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priv->uartclk = clk_data->clk_rate;
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/* flush the trasmitter empty before changing hw setting */
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while (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_TEMT))
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;
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tmp = readl(priv->membase + UNIPHIER_UART_LCR_MCR);
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tmp &= ~UNIPHIER_UART_LCR_MASK;
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tmp |= FIELD_PREP(UNIPHIER_UART_LCR_MASK, UART_LCR_WLEN8);
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