Dear Marek,
Applied on drm-misc-next.
Many thanks for your patch,
Philippe :-)
ST Restricted
-----Original Message-----
From: Marek Vasut <marex@xxxxxxx>
Sent: Wednesday, January 27, 2021 12:08
To: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Marek Vasut <marex@xxxxxxx>; Yannick FERTRE <yannick.fertre@xxxxxx>; Alexandre TORGUE <alexandre.torgue@xxxxxx>; Antonio BORNEO <antonio.borneo@xxxxxx>; Benjamin Gaignard <benjamin.gaignard@xxxxxx>; Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>; Philippe CORNU <philippe.cornu@xxxxxx>; Sam Ravnborg <sam@xxxxxxxxxxxx>; Vincent ABRIOU <vincent.abriou@xxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Subject: [PATCH V4] drm/stm: Fix bus_flags handling
The drm_display_mode_to_videomode() does not populate DISPLAY_FLAGS_DE_LOW or DISPLAY_FLAGS_PIXDATA_NEGEDGE flags in struct videomode. Therefore, no matter what polarity the next bridge or display might require, these flags are never set, and thus the LTDC GCR_DEPOL and GCR_PCPOL bits are never set, and the LTDC behaves as if both DISPLAY_FLAGS_PIXDATA_POSEDGE and DISPLAY_FLAGS_DE_HIGH were always set.
The fix for this problem is taken almost verbatim from MXSFB driver. In case there is a bridge attached to the LTDC, the bridge might have extra polarity requirements, so extract bus_flags from the bridge and use them for LTDC configuration. Otherwise, extract bus_flags from the connector, which is the display.
Fixes: b759012c5fa7 ("drm/stm: Add STM32 LTDC driver")
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Signed-off-by: Yannick Fertre <yannick.fertre@xxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
Cc: Antonio Borneo <antonio.borneo@xxxxxx>
Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: Philippe Cornu <philippe.cornu@xxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Vincent Abriou <vincent.abriou@xxxxxx>
Cc: Yannick Fertre <yannick.fertre@xxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
To: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
V2: Check if ldev->bridge->timings is non-NULL before accessing it
V3: get bus_flags from connector (from Yannick)
- Display controller could support several connectors (not connected at
the same time). ie: stm32mp15c-DK2 board have 2 connectors (HDMI + DSI).
Driver check which connector is connected to get the bus flag.
V4: get bridge from encoder (from Yannick)
---
drivers/gpu/drm/stm/ltdc.c | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index 6e28e6b60e72..acc9f6694eb6 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -544,13 +544,42 @@ static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc) {
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_device *ddev = crtc->dev;
+ struct drm_connector_list_iter iter;
+ struct drm_connector *connector = NULL;
+ struct drm_encoder *encoder = NULL;
+ struct drm_bridge *bridge = NULL;
struct drm_display_mode *mode = &crtc->state->adjusted_mode;
struct videomode vm;
u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
u32 total_width, total_height;
+ u32 bus_flags = 0;
u32 val;
int ret;
+ /* get encoder from crtc */
+ drm_for_each_encoder(encoder, ddev)
+ if (encoder->crtc == crtc)
+ break;
+
+ if (encoder) {
+ /* get bridge from encoder */
+ list_for_each_entry(bridge, &encoder->bridge_chain, chain_node)
+ if (bridge->encoder == encoder)
+ break;
+
+ /* Get the connector from encoder */
+ drm_connector_list_iter_begin(ddev, &iter);
+ drm_for_each_connector_iter(connector, &iter)
+ if (connector->encoder == encoder)
+ break;
+ drm_connector_list_iter_end(&iter);
+ }
+
+ if (bridge && bridge->timings)
+ bus_flags = bridge->timings->input_bus_flags;
+ else if (connector)
+ bus_flags = connector->display_info.bus_flags;
+
if (!pm_runtime_active(ddev->dev)) {
ret = pm_runtime_get_sync(ddev->dev);
if (ret) {
@@ -586,10 +615,10 @@ static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
val |= GCR_VSPOL;
- if (vm.flags & DISPLAY_FLAGS_DE_LOW)
+ if (bus_flags & DRM_BUS_FLAG_DE_LOW)
val |= GCR_DEPOL;
- if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+ if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
val |= GCR_PCPOL;
reg_update_bits(ldev->regs, LTDC_GCR,
--
2.29.2
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