serial: samsung: Enable baud clock for UART reset procedure in resume (1ff3652b) · Commits · 戴 / test

Ensure that the baud clock is also enabled for UART register writes in driver resume. On Exynos5433 SoC this is needed to avoid external abort issue. Signed-off-by:

Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by:

Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/samsung.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -1941,7 +1941,11 @@ static int s3c24xx_serial_resume(struct device *dev)

		if (port) {
		clk_prepare_enable(ourport->clk);
		if (!IS_ERR(ourport->baudclk))
		clk_prepare_enable(ourport->baudclk);
		s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
		if (!IS_ERR(ourport->baudclk))
		clk_disable_unprepare(ourport->baudclk);
		clk_disable_unprepare(ourport->clk);

		uart_resume_port(&s3c24xx_uart_drv, port);
		@@ -1964,7 +1968,11 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
		if (rx_enabled(port))
		uintm &= ~S3C64XX_UINTM_RXD_MSK;
		clk_prepare_enable(ourport->clk);
		if (!IS_ERR(ourport->baudclk))
		clk_prepare_enable(ourport->baudclk);
		wr_regl(port, S3C64XX_UINTM, uintm);
		if (!IS_ERR(ourport->baudclk))
		clk_disable_unprepare(ourport->baudclk);
		clk_disable_unprepare(ourport->clk);
		}
		}

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