Re: [PATCH] drm/panel: Move AUX B116XW03 out of panel-edp back to panel-simple
From: AngeloGioacchino Del Regno
Date: Tue Sep 26 2023 - 04:06:46 EST
Il 26/09/23 00:00, Douglas Anderson ha scritto:
In commit 5f04e7ce392d ("drm/panel-edp: Split eDP panels out of
panel-simple") I moved a pile of panels out of panel-simple driver
into the newly created panel-edp driver. One of those panels, however,
shouldn't have been moved.
As is clear from commit e35e305eff0f ("drm/panel: simple: Add AUO
B116XW03 panel support"), AUX B116XW03 is an LVDS panel. It's used in
exynos5250-snow and exynos5420-peach-pit where it's clear that the
panel is hooked up with LVDS. Furthermore, searching for datasheets I
found one that makes it clear that this panel is LVDS.
As far as I can tell, I got confused because in commit 88d3457ceb82
("drm/panel: auo,b116xw03: fix flash backlight when power on") Jitao
Shi added "DRM_MODE_CONNECTOR_eDP". That seems wrong. Looking at the
downstream ChromeOS trees, it seems like some Mediatek boards are
using a panel that they call "auo,b116xw03" that's an eDP panel. The
best I can guess is that they actually have a different panel that has
similar timing. If so then the proper panel should be used or they
should switch to the generic "edp-panel" compatible.
When moving this back to panel-edp, I wasn't sure what to use for
.bus_flags and .bus_format and whether to add the extra "enable" delay
from commit 88d3457ceb82 ("drm/panel: auo,b116xw03: fix flash
backlight when power on"). I've added formats/flags/delays based on my
(inexpert) analysis of the datasheet. These are untested.
NOTE: if/when this is backported to stable, we might run into some
trouble. Specifically, before 474c162878ba ("arm64: dts: mt8183:
jacuzzi: Move panel under aux-bus") this panel was used by
"mt8183-kukui-jacuzzi", which assumed it was an eDP panel. I don't
know what to suggest for that other than someone making up a bogus
panel for jacuzzi that's just for the stable channel.
Fixes: 88d3457ceb82 ("drm/panel: auo,b116xw03: fix flash backlight when power on")
Fixes: 5f04e7ce392d ("drm/panel-edp: Split eDP panels out of panel-simple")
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---
I haven't had a snow or peach-pit hooked up for debugging / testing
for years. I presume that they must be broken and hope that this fixes
them.
We could avoid backport breakages by avoiding to backport this to any kernel
that doesn't contain commit 474c162878ba ("arm64: dts: mt8183: jacuzzi: Move
panel under aux-bus")... because creating a dummy panel to get two wrongs
right is definitely not ok.
Cheers,
Angelo
drivers/gpu/drm/panel/panel-edp.c | 29 -----------------------
drivers/gpu/drm/panel/panel-simple.c | 35 ++++++++++++++++++++++++++++
2 files changed, 35 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
index feb665df35a1..95c8472d878a 100644
--- a/drivers/gpu/drm/panel/panel-edp.c
+++ b/drivers/gpu/drm/panel/panel-edp.c
@@ -976,32 +976,6 @@ static const struct panel_desc auo_b116xak01 = {
},
};
-static const struct drm_display_mode auo_b116xw03_mode = {
- .clock = 70589,
- .hdisplay = 1366,
- .hsync_start = 1366 + 40,
- .hsync_end = 1366 + 40 + 40,
- .htotal = 1366 + 40 + 40 + 32,
- .vdisplay = 768,
- .vsync_start = 768 + 10,
- .vsync_end = 768 + 10 + 12,
- .vtotal = 768 + 10 + 12 + 6,
- .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
-};
-
-static const struct panel_desc auo_b116xw03 = {
- .modes = &auo_b116xw03_mode,
- .num_modes = 1,
- .bpc = 6,
- .size = {
- .width = 256,
- .height = 144,
- },
- .delay = {
- .enable = 400,
- },
-};
-
static const struct drm_display_mode auo_b133han05_mode = {
.clock = 142600,
.hdisplay = 1920,
@@ -1725,9 +1699,6 @@ static const struct of_device_id platform_of_match[] = {
}, {
.compatible = "auo,b116xa01",
.data = &auo_b116xak01,
- }, {
- .compatible = "auo,b116xw03",
- .data = &auo_b116xw03,
}, {
.compatible = "auo,b133han05",
.data = &auo_b133han05,
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index bb89e6d047bc..439d26928938 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -919,6 +919,38 @@ static const struct panel_desc auo_b101xtn01 = {
},
};
+static const struct drm_display_mode auo_b116xw03_mode = {
+ .clock = 70589,
+ .hdisplay = 1366,
+ .hsync_start = 1366 + 40,
+ .hsync_end = 1366 + 40 + 40,
+ .htotal = 1366 + 40 + 40 + 32,
+ .vdisplay = 768,
+ .vsync_start = 768 + 10,
+ .vsync_end = 768 + 10 + 12,
+ .vtotal = 768 + 10 + 12 + 6,
+ .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+};
+
+static const struct panel_desc auo_b116xw03 = {
+ .modes = &auo_b116xw03_mode,
+ .num_modes = 1,
+ .bpc = 6,
+ .size = {
+ .width = 256,
+ .height = 144,
+ },
+ .delay = {
+ .prepare = 1,
+ .enable = 200,
+ .disable = 200,
+ .unprepare = 500,
+ },
+ .bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
+ .bus_flags = DRM_BUS_FLAG_DE_HIGH,
+ .connector_type = DRM_MODE_CONNECTOR_LVDS,
+};
+
static const struct display_timing auo_g070vvn01_timings = {
.pixelclock = { 33300000, 34209000, 45000000 },
.hactive = { 800, 800, 800 },
@@ -4128,6 +4160,9 @@ static const struct of_device_id platform_of_match[] = {
}, {
.compatible = "auo,b101xtn01",
.data = &auo_b101xtn01,
+ }, {
+ .compatible = "auo,b116xw03",
+ .data = &auo_b116xw03,
}, {
.compatible = "auo,g070vvn01",
.data = &auo_g070vvn01,