2022-09-15 08:01:57

by Rex-BC Chen (陳柏辰)

Subject: [PATCH 1/3] drm/mediatek: dp: Refactor drivers in mtk_dp_bdg_detect()

It is more clear to modify this in mtk_dp_bdg_detect().

Signed-off-by: Bo-Chen Chen <[email protected]>
---
drivers/gpu/drm/mediatek/mtk_dp.c | 66 ++++++++++++++++---------------
1 file changed, 34 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index dfa942ca62da..c72c646e25e9 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -1933,39 +1933,41 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
bool enabled = mtk_dp->enabled;
u8 sink_count = 0;

- if (mtk_dp->train_info.cable_plugged_in) {
- if (!enabled) {
- /* power on aux */
- mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
- DP_PWR_STATE_BANDGAP_TPLL_LANE,
- DP_PWR_STATE_MASK);
-
- /* power on panel */
- drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
- usleep_range(2000, 5000);
- }
- /*
- * Some dongles still source HPD when they do not connect to any
- * sink device. To avoid this, we need to read the sink count
- * to make sure we do connect to sink devices. After this detect
- * function, we just need to check the HPD connection to check
- * whether we connect to a sink device.
- */
- drm_dp_dpcd_readb(&mtk_dp->aux, DP_SINK_COUNT, &sink_count);
- if (DP_GET_SINK_COUNT(sink_count))
- ret = connector_status_connected;
-
- if (!enabled) {
- /* power off panel */
- drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
- usleep_range(2000, 3000);
-
- /* power off aux */
- mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
- DP_PWR_STATE_BANDGAP_TPLL,
- DP_PWR_STATE_MASK);
- }
+ if (!mtk_dp->train_info.cable_plugged_in)
+ return ret;
+
+ if (!enabled) {
+ /* power on aux */
+ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+ DP_PWR_STATE_BANDGAP_TPLL_LANE,
+ DP_PWR_STATE_MASK);
+
+ /* power on panel */
+ drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+ usleep_range(2000, 5000);
}
+ /*
+ * Some dongles still source HPD when they do not connect to any
+ * sink device. To avoid this, we need to read the sink count
+ * to make sure we do connect to sink devices. After this detect
+ * function, we just need to check the HPD connection to check
+ * whether we connect to a sink device.
+ */
+ drm_dp_dpcd_readb(&mtk_dp->aux, DP_SINK_COUNT, &sink_count);
+ if (DP_GET_SINK_COUNT(sink_count))
+ ret = connector_status_connected;
+
+ if (!enabled) {
+ /* power off panel */
+ drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+ usleep_range(2000, 3000);
+
+ /* power off aux */
+ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+ DP_PWR_STATE_BANDGAP_TPLL,
+ DP_PWR_STATE_MASK);
+ }
+
return ret;
}

--
2.18.0

2022-09-15 10:43:09

by AngeloGioacchino Del Regno

Subject: Re: [PATCH 1/3] drm/mediatek: dp: Refactor drivers in mtk_dp_bdg_detect()

Il 15/09/22 09:50, Bo-Chen Chen ha scritto:
> It is more clear to modify this in mtk_dp_bdg_detect().

I agree with this commit. Since you anyway have to send a v2 of this series,
please clarify the commit description and title, something like:

drm/mediatek: dp: Reduce indentation in mtk_dp_bdg_detect()

In order to improve human readability, reduce the indentation by returning
early if the dp/edp cable is not plugged in.

Cheers,
Angelo