Re: [PATCH v5 06/13] drm/mediatek: Turn off the layers with zero width or height
flat view
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Date: 2024-02-15 10:45:58
Also in:
dri-devel, linux-mediatek, lkml
Il 15/02/24 11:11, Hsiao Chien Sung ha scritto:
We found that IGT (Intel GPU Tool) will try to commit layers with
zero width or height and lead to undefined behaviors in hardware.
Disable the layers in such a situation.
Fixes: 777b7bc86a0a3 ("drm/mediatek: Add ovl_adaptor support for MT8195")
Fixes: fa97fe71f6f93 ("drm/mediatek: Add ETHDR support for MT8195")
Signed-off-by: Hsiao Chien Sung <redacted>This commit should be sent separately from this series, as it is fixing things that are not related just to IGT, but also to corner cases in regular non-testing usecases. In any case, it's not mandatory as that depends on what the maintainer prefers, so it's CK's call anyway. Besides that, Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
quoted hunk ↗ jump to hunk
--- drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 2 +- drivers/gpu/drm/mediatek/mtk_ethdr.c | 7 ++++++- 2 files changed, 7 insertions(+), 2 deletions(-)diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c index d4a13a1402148..68a20312ac6f1 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c@@ -157,7 +157,7 @@ void mtk_ovl_adaptor_layer_config(struct device *dev, unsigned int idx, merge = ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_MERGE0 + idx]; ethdr = ovl_adaptor->ovl_adaptor_comp[OVL_ADAPTOR_ETHDR0]; - if (!pending->enable) { + if (!pending->enable || !pending->width || !pending->height) { mtk_merge_stop_cmdq(merge, cmdq_pkt); mtk_mdp_rdma_stop(rdma_l, cmdq_pkt); mtk_mdp_rdma_stop(rdma_r, cmdq_pkt);diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c b/drivers/gpu/drm/mediatek/mtk_ethdr.c index 73dc4da3ba3bd..69872b77922eb 100644 --- a/drivers/gpu/drm/mediatek/mtk_ethdr.c +++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c@@ -160,7 +160,12 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx, if (idx >= 4) return; - if (!pending->enable) { + if (!pending->enable || !pending->width || !pending->height) { + /* + * instead of disabling layer with MIX_SRC_CON directly + * set the size to 0 to avoid screen shift due to mixer + * mode switch (hardware behavior) + */ mtk_ddp_write(cmdq_pkt, 0, &mixer->cmdq_base, mixer->regs, MIX_L_SRC_SIZE(idx)); return; }
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