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authorAmit Singh Tomar <amittomer25@gmail.com>2020-04-16 22:11:57 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-04-23 15:46:30 +0200
commitabf42d2f333b21bf8d33b2fbb8a85fa62037ac01 (patch)
treea01cc430aee6b04f692ab4d7b388f3c1cb037c45 /drivers/tty
parentvt: don't use kmalloc() for the unicode screen buffer (diff)
downloadlinux-abf42d2f333b21bf8d33b2fbb8a85fa62037ac01.tar.xz
linux-abf42d2f333b21bf8d33b2fbb8a85fa62037ac01.zip
tty: serial: owl: add "much needed" clk_prepare_enable()
commit 8ba92cf59335 ("arm64: dts: actions: s700: Add Clock Management Unit") breaks the UART on Cubieboard7-lite (based on S700 SoC), This is due to the fact that generic clk routine clk_disable_unused() disables the gate clks, and that in turns disables OWL UART (but UART driver never enables it). To prove this theory, Andre suggested to use "clk_ignore_unused" in kernel commnd line and it worked (Kernel happily lands into RAMFS world :)). This commit fix this up by adding clk_prepare_enable(). Fixes: 8ba92cf59335 ("arm64: dts: actions: s700: Add Clock Management Unit") Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/1587067917-1400-1-git-send-email-amittomer25@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/owl-uart.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c
index 42c8cc93b603..c149f8c30007 100644
--- a/drivers/tty/serial/owl-uart.c
+++ b/drivers/tty/serial/owl-uart.c
@@ -680,6 +680,12 @@ static int owl_uart_probe(struct platform_device *pdev)
return PTR_ERR(owl_port->clk);
}
+ ret = clk_prepare_enable(owl_port->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "could not enable clk\n");
+ return ret;
+ }
+
owl_port->port.dev = &pdev->dev;
owl_port->port.line = pdev->id;
owl_port->port.type = PORT_OWL;
@@ -712,6 +718,7 @@ static int owl_uart_remove(struct platform_device *pdev)
uart_remove_one_port(&owl_uart_driver, &owl_port->port);
owl_uart_ports[pdev->id] = NULL;
+ clk_disable_unprepare(owl_port->clk);
return 0;
}