Hi, Hsin-yi:
Hsin-Yi Wang hsinyi@chromium.org 於 2021年7月12日 週一 下午5:47寫道：
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.
Applied to mediatek-drm-fixes [1], thanks.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?...
Regards, Chun-Kuang.
Fixes: ec8747c52434 ("drm/mediatek: dpi: Add bus format negotiation") Signed-off-by: Hsin-Yi Wang hsinyi@chromium.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