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authorJan200101 <sentrycraft123@gmail.com>2021-01-15 00:10:49 +0100
committerJan200101 <sentrycraft123@gmail.com>2021-01-15 00:10:49 +0100
commit3814de27892f88d7bee46f434d386ada761fd4ba (patch)
tree0470c6d559ec46201e695664cfaef60ea541f4df /SOURCES/arm64-pwm-rockchip-Keep-enabled-PWMs-running-while-probing.patch
parentd6cbdaa78bfe1ecf6aa6a95e743bcba390a2ae93 (diff)
downloadkernel-fsync-3814de27892f88d7bee46f434d386ada761fd4ba.tar.gz
kernel-fsync-3814de27892f88d7bee46f434d386ada761fd4ba.zip
kernel 5.10.6
Diffstat (limited to 'SOURCES/arm64-pwm-rockchip-Keep-enabled-PWMs-running-while-probing.patch')
-rw-r--r--SOURCES/arm64-pwm-rockchip-Keep-enabled-PWMs-running-while-probing.patch141
1 files changed, 0 insertions, 141 deletions
diff --git a/SOURCES/arm64-pwm-rockchip-Keep-enabled-PWMs-running-while-probing.patch b/SOURCES/arm64-pwm-rockchip-Keep-enabled-PWMs-running-while-probing.patch
deleted file mode 100644
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--- a/SOURCES/arm64-pwm-rockchip-Keep-enabled-PWMs-running-while-probing.patch
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-Subject: [PATCH v2] pwm: rockchip: Keep enabled PWMs running while probing
-Date: Sat, 19 Sep 2020 15:33:06 -0400
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-
-Following commit cfc4c189bc70 ("pwm: Read initial hardware state at
-request time") the Rockchip PWM driver can no longer assume a device's
-pwm_state structure has been populated after a call to pwmchip_add().
-Consequently, the test in rockchip_pwm_probe() intended to prevent the
-driver from stopping PWM devices already enabled by the bootloader no
-longer functions reliably and this can lead to the kernel hanging
-during startup, particularly on devices like the Pinebook Pro that use
-a PWM-controlled backlight for their display.
-
-Avoid this by querying the device directly at probe time to determine
-whether or not it is enabled.
-
-Fixes: cfc4c189bc70 ("pwm: Read initial hardware state at request time")
-Signed-off-by: Simon South <simon@simonsouth.net>
-Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
-Reviewed-by: Heiko Stuebner <heiko@sntech.de>
----
- drivers/pwm/pwm-rockchip.c | 5 ++++-
- 1 file changed, 4 insertions(+), 1 deletion(-)
-
-diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
-index eb8c9cb645a6..098e94335cb5 100644
---- a/drivers/pwm/pwm-rockchip.c
-+++ b/drivers/pwm/pwm-rockchip.c
-@@ -288,6 +288,7 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
- const struct of_device_id *id;
- struct rockchip_pwm_chip *pc;
- struct resource *r;
-+ u32 enable_conf, ctrl;
- int ret, count;
-
- id = of_match_device(rockchip_pwm_dt_ids, &pdev->dev);
-@@ -362,7 +363,9 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
- }
-
- /* Keep the PWM clk enabled if the PWM appears to be up and running. */
-- if (!pwm_is_enabled(pc->chip.pwms))
-+ enable_conf = pc->data->enable_conf;
-+ ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl);
-+ if ((ctrl & enable_conf) != enable_conf)
- clk_disable(pc->clk);
-
- return 0;