[RESEND PATCH] serial: samsung: enable clock before accessing interrupt mask resister
From: 남영민 <hidden>
Date: 2017-02-01 10:25:49
Also in:
linux-samsung-soc
Subsystem:
arm/samsung s3c, s5p and exynos arm architectures, the rest, tty layer and serial drivers · Maintainers:
Krzysztof Kozlowski, Peter Griffin, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Ensure that the uart clock is enabled prior to writing to the interrupt mask register in s3c24xx_serial_resume_noirq function. Without enabing the uart clock, the uart register cannot be accessed. Signed-off-by: Youngmin Nam <redacted> --- drivers/tty/serial/samsung.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index f44615f..06488fd 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c@@ -1921,6 +1921,7 @@ static int s3c24xx_serial_resume(struct device *dev) static int s3c24xx_serial_resume_noirq(struct device *dev) { struct uart_port *port = s3c24xx_dev_to_port(dev); + struct s3c24xx_uart_port *ourport = to_ourport(port); if (port) { /* restore IRQ mask */
@@ -1930,7 +1931,9 @@ static int s3c24xx_serial_resume_noirq(struct device *dev) uintm &= ~S3C64XX_UINTM_TXD_MSK; if (rx_enabled(port)) uintm &= ~S3C64XX_UINTM_RXD_MSK; + clk_prepare_enable(ourport->clk); wr_regl(port, S3C64XX_UINTM, uintm); + clk_disable_unprepare(ourport->clk); } }
--
2.8.1