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| author | Amit Singh Tomar <amittomer25@gmail.com> | 2020-04-17 01:41:57 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-23 15:46:30 +0200 |
| commit | abf42d2f333b21bf8d33b2fbb8a85fa62037ac01 (patch) | |
| tree | a01cc430aee6b04f692ab4d7b388f3c1cb037c45 /drivers | |
| parent | 9a98e7a80f95378c9ee0c644705e3b5aa54745f1 (diff) | |
| download | linux-abf42d2f333b21bf8d33b2fbb8a85fa62037ac01.tar.bz2 | |
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')
| -rw-r--r-- | drivers/tty/serial/owl-uart.c | 7 |
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; } |