| Message ID | 1614341544-5306-1-git-send-email-kgunda@codeaurora.org |
|---|---|
| Headers | show |
| Series | Fix WLED FSC Sync and brightness Sync settings | expand |
On Fri, Feb 26, 2021 at 05:42:23PM +0530, Kiran Gunda wrote: > Currently, for WLED5, the FSC (Full scale current) setting is not > updated properly due to driver toggling the wrong register after > an FSC update. > > On WLED5 we should only toggle the MOD_SYNC bit after a brightness > update. For an FSC update we need to toggle the SYNC bits instead. > > Fix it by adopting the common wled3_sync_toggle() for WLED5 and > introducing new code to the brightness update path to compensate. > > Signed-off-by: Kiran Gunda <kgunda@codeaurora.org> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Daniel. > --- > drivers/video/backlight/qcom-wled.c | 25 +++++++++++++++++++------ > 1 file changed, 19 insertions(+), 6 deletions(-) > > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c > index 3bc7800..aef52b9 100644 > --- a/drivers/video/backlight/qcom-wled.c > +++ b/drivers/video/backlight/qcom-wled.c > @@ -348,7 +348,7 @@ static int wled3_sync_toggle(struct wled *wled) > return rc; > } > > -static int wled5_sync_toggle(struct wled *wled) > +static int wled5_mod_sync_toggle(struct wled *wled) > { > int rc; > u8 val; > @@ -445,10 +445,23 @@ static int wled_update_status(struct backlight_device *bl) > goto unlock_mutex; > } > > - rc = wled->wled_sync_toggle(wled); > - if (rc < 0) { > - dev_err(wled->dev, "wled sync failed rc:%d\n", rc); > - goto unlock_mutex; > + if (wled->version < 5) { > + rc = wled->wled_sync_toggle(wled); > + if (rc < 0) { > + dev_err(wled->dev, "wled sync failed rc:%d\n", rc); > + goto unlock_mutex; > + } > + } else { > + /* > + * For WLED5 toggling the MOD_SYNC_BIT updates the > + * brightness > + */ > + rc = wled5_mod_sync_toggle(wled); > + if (rc < 0) { > + dev_err(wled->dev, "wled mod sync failed rc:%d\n", > + rc); > + goto unlock_mutex; > + } > } > } > > @@ -1459,7 +1472,7 @@ static int wled_configure(struct wled *wled) > size = ARRAY_SIZE(wled5_opts); > *cfg = wled5_config_defaults; > wled->wled_set_brightness = wled5_set_brightness; > - wled->wled_sync_toggle = wled5_sync_toggle; > + wled->wled_sync_toggle = wled3_sync_toggle; > wled->wled_cabc_config = wled5_cabc_config; > wled->wled_ovp_delay = wled5_ovp_delay; > wled->wled_auto_detection_required = > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project >
This patch series has the following two WLED fixes 1. As per the current implementation, for WLED5, after the FSC (Full Scale Current) update the driver is incorrectly toggling the MOD_SYNC register instead of toggling the SYNC register. The patch 1/2 fixes this by toggling the SYNC register after FSC update. 2. Currently, the sync bits are transitioned from 1 to 0 after FSC and brightness update. As per hardware team recommendation the FSC and brightness sync takes place from 0 to 1 transition. The patch 2/2 fies this issue. Changes from V1: 1. Updated the cover letter. 2. Updated the description of the patches as per Daniel's suggestion. Kiran Gunda (2): backlight: qcom-wled: Fix FSC update issue for WLED5 backlight: qcom-wled: Correct the sync_toggle sequence drivers/video/backlight/qcom-wled.c | 37 +++++++++++++++++++++++++------------ 1 file changed, 25 insertions(+), 12 deletions(-)