4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 61170ee9386888f1e6f7e9cc58e8d9a8c2a3c1dd ]
Commit 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly to human eye") made the parse-dt function return early when using an auto- generated brightness-table, but didn't take into account that some more settings were handled below the brightness handling, like power-on-delays and also setting the pdata enable-gpio to -EINVAL.
This surfaces for example in the case of a backlight without any enable-gpio which then tries to use gpio-0 in error.
Fix this by simply moving the trailing settings above the brightness handling.
Fixes: 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly to human eye") Signed-off-by: Heiko Stuebner heiko.stuebner@bq.com Acked-by: Daniel Thompson daniel.thompson@linaro.org Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/video/backlight/pwm_bl.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index f9ef0673a083c..aded3213bfb51 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -268,6 +268,16 @@ static int pwm_backlight_parse_dt(struct device *dev,
memset(data, 0, sizeof(*data));
+ /* + * These values are optional and set as 0 by default, the out values + * are modified only if a valid u32 value can be decoded. + */ + of_property_read_u32(node, "post-pwm-on-delay-ms", + &data->post_pwm_on_delay); + of_property_read_u32(node, "pwm-off-delay-ms", &data->pwm_off_delay); + + data->enable_gpio = -EINVAL; + /* * Determine the number of brightness levels, if this property is not * set a default table of brightness levels will be used. @@ -380,15 +390,6 @@ static int pwm_backlight_parse_dt(struct device *dev, data->max_brightness--; }
- /* - * These values are optional and set as 0 by default, the out values - * are modified only if a valid u32 value can be decoded. - */ - of_property_read_u32(node, "post-pwm-on-delay-ms", - &data->post_pwm_on_delay); - of_property_read_u32(node, "pwm-off-delay-ms", &data->pwm_off_delay); - - data->enable_gpio = -EINVAL; return 0; }