diff options
| author | Hsiao Chien Sung <shawn.sung@mediatek.corp-partner.google.com> | 2024-02-20 17:37:11 +0800 |
|---|---|---|
| committer | Chun-Kuang Hu <chunkuang.hu@kernel.org> | 2024-02-27 00:02:55 +0000 |
| commit | 5306b3fe57370e8f42f5d2924c063226e76b16a4 (patch) | |
| tree | 6a1d0bce3a275b83b67ac54f050c28d8f782678a /drivers/gpu/drm/mediatek/mtk_drm_crtc.c | |
| parent | e14cba94bc19ff78545d87a6f85b871cf012df3f (diff) | |
drm/mediatek: Filter modes according to hardware capability
We found a stability issue on MT8188 when connecting an external monitor
in 2560x1440@144Hz mode. Checked with the designer, there is a function
called "prefetch" which is working during VBP (triggered by VSYNC).
If the duration of VBP is too short, the throughput requirement could
increase more than 3 times and lead to stability issues.
The mode settings that VDOSYS supports are mainly affected by clock
rate and throughput, display driver should filter these settings
according to the SoC's limitation to avoid unstable conditions.
Since currently the mode filter is only available on MT8195 and MT8188
and they share the same compatible name, the reference number (8250)
is hard coded instead of in the driver data.
Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.corp-partner.google.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240220093711.20546-2-shawn.sung@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_drm_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index c729af3b9822..3b55c7a68bde 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -213,6 +213,22 @@ static void mtk_drm_crtc_destroy_state(struct drm_crtc *crtc, kfree(to_mtk_crtc_state(state)); } +static enum drm_mode_status +mtk_drm_crtc_mode_valid(struct drm_crtc *crtc, + const struct drm_display_mode *mode) +{ + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); + enum drm_mode_status status = MODE_OK; + int i; + + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) { + status = mtk_ddp_comp_mode_valid(mtk_crtc->ddp_comp[i], mode); + if (status != MODE_OK) + break; + } + return status; +} + static bool mtk_drm_crtc_mode_fixup(struct drm_crtc *crtc, const struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) @@ -831,6 +847,7 @@ static const struct drm_crtc_funcs mtk_crtc_funcs = { static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = { .mode_fixup = mtk_drm_crtc_mode_fixup, .mode_set_nofb = mtk_drm_crtc_mode_set_nofb, + .mode_valid = mtk_drm_crtc_mode_valid, .atomic_begin = mtk_drm_crtc_atomic_begin, .atomic_flush = mtk_drm_crtc_atomic_flush, .atomic_enable = mtk_drm_crtc_atomic_enable, |