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Message-Id: <20210712094657.1159299-1-hsinyi@chromium.org>
Date: Mon, 12 Jul 2021 17:46:57 +0800
From: Hsin-Yi Wang <hsinyi@...omium.org>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Matthias Brugger <matthias.bgg@...il.com>,
Rex-BC Chen <rex-bc.chen@...iatek.com>,
Jitao Shi <jitao.shi@...iatek.com>,
dri-devel@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/mediatek: mtk-dpi: Set out_fmt from config if not the last bridge
atomic_get_output_bus_fmts() is only called when the bridge is the last
element in the bridge chain.
If mtk-dpi is not the last bridge, the format of output_bus_cfg is
MEDIA_BUS_FMT_FIXED, and mtk_dpi_dual_edge() will fail to write correct
value to regs.
Fixes: ec8747c52434 ("drm/mediatek: dpi: Add bus format negotiation")
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index bced555648b01..25c565f9179cc 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -610,6 +610,10 @@ static int mtk_dpi_bridge_atomic_check(struct drm_bridge *bridge,
out_bus_format = bridge_state->output_bus_cfg.format;
+ if (out_bus_format == MEDIA_BUS_FMT_FIXED)
+ if (dpi->conf->num_output_fmts)
+ out_bus_format = dpi->conf->output_fmts[0];
+
dev_dbg(dpi->dev, "input format 0x%04x, output format 0x%04x\n",
bridge_state->input_bus_cfg.format,
bridge_state->output_bus_cfg.format);
--
2.32.0.93.g670b81a890-goog
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