linux-kernel - [PATCH] drm/panel: Add prepare_prev

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Date:   Tue, 25 Jul 2023 15:56:10 -0700
From:   Jessica Zhang <quic_jesszhan@...cinc.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <quic_abhinavk@...cinc.com>, <quic_parellan@...cinc.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Jessica Zhang" <quic_jesszhan@...cinc.com>
Subject: [PATCH] drm/panel: Add prepare_prev_first flag to Visionox
 VTDR6130

Due to a recent introduction of the pre_enable_prev_first bridge flag [1],
the panel driver will be probed before the DSI is enabled, causing the
DCS commands to fail to send.

Ensure that DSI is enabled before panel probe by setting the
prepare_prev_first flag for the panel.

[1] commit 4fb912e5e190 ("drm/bridge: Introduce pre_enable_prev_first to alter bridge init order")

Fixes: 2349183d32d8 ("drm/panel: add visionox vtdr6130 DSI panel driver")
Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/panel/panel-visionox-vtdr6130.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
index bb0dfd86ea67..e1363e128e7e 100644
--- a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
+++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
@@ -296,6 +296,7 @@ static int visionox_vtdr6130_probe(struct mipi_dsi_device *dsi)
 	dsi->format = MIPI_DSI_FMT_RGB888;
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_NO_EOT_PACKET |
 			  MIPI_DSI_CLOCK_NON_CONTINUOUS;
+	ctx->panel.prepare_prev_first = true;
 
 	drm_panel_init(&ctx->panel, dev, &visionox_vtdr6130_panel_funcs,
 		       DRM_MODE_CONNECTOR_DSI);

---
base-commit: 28a5c036b05fc5c935cc72d76abd3589825ea9cd
change-id: 20230717-visionox-vtdr-prev-first-e00ae02eec9f

Best regards,
-- 
Jessica Zhang <quic_jesszhan@...cinc.com>