From: Marijn Suijten Date: Mon, 17 Feb 2025 11:17:43 +0000 (+0100) Subject: drm/msm/dpu: Remove arbitrary limit of 1 interface in DSC topology X-Git-Tag: v6.15-rc1~120^2~11^2~67 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d245ce568929e30f650e260631f7ad14970d7c2c;p=thirdparty%2Flinux.git drm/msm/dpu: Remove arbitrary limit of 1 interface in DSC topology When DSC is enabled the number of interfaces is forced to be 1, and documented that it is a "power-optimal" layout to use two DSC encoders together with two Layer Mixers. However, the same layout (two DSC hard-slice encoders with two LMs) is also used when the display is fed with data over two instead of one interface (common on 4k@120Hz smartphone panels with Dual-DSI). Solve this by simply removing the num_intf = 1 assignment as the count is already calculated by computing the number of physical encoders within the virtual encoder. Fixes: 7e9cc175b159 ("drm/msm/disp/dpu1: Add support for DSC in topology") Reviewed-by: Dmitry Baryshkov Reviewed-by: Jessica Zhang Signed-off-by: Marijn Suijten Patchwork: https://patchwork.freedesktop.org/patch/637649/ Link: https://lore.kernel.org/r/20250217-drm-msm-initial-dualpipe-dsc-fixes-v3-3-913100d6103f@somainline.org Signed-off-by: Dmitry Baryshkov --- diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c index 938d8b05a4cd4..32992e9525530 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c @@ -689,20 +689,21 @@ static struct msm_display_topology dpu_encoder_get_topology( if (dsc) { /* - * Use 2 DSC encoders and 2 layer mixers per single interface + * Use 2 DSC encoders, 2 layer mixers and 1 or 2 interfaces * when Display Stream Compression (DSC) is enabled, * and when enough DSC blocks are available. * This is power-optimal and can drive up to (including) 4k * screens. */ - if (dpu_kms->catalog->dsc_count >= 2) { + WARN(topology.num_intf > 2, + "DSC topology cannot support more than 2 interfaces\n"); + if (intf_count >= 2 || dpu_kms->catalog->dsc_count >= 2) { topology.num_dsc = 2; topology.num_lm = 2; } else { topology.num_dsc = 1; topology.num_lm = 1; } - topology.num_intf = 1; } /*