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Fri, 06 Mar 2026 01:26:37 -0800 (PST) Received: from nuvole ([144.202.86.13]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ae83e57afesm13214405ad.6.2026.03.06.01.26.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Mar 2026 01:26:37 -0800 (PST) From: Pengyu Luo To: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: Pengyu Luo , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH] drm/msm/dsi: setup RC model properly Date: Fri, 6 Mar 2026 17:25:53 +0800 Message-ID: <20260306092553.37973-1-mitltlatltl@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Using incorrect parameters does not seem to affect the display, but we should use the correct in accordance with the DSC 1.1 or 1.2. Signed-off-by: Pengyu Luo --- drivers/gpu/drm/msm/dsi/dsi_host.c | 31 +++++++++++++++++++++++++++--- 1 file changed, 28 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/d= si_host.c index b60b26ddb0..276c63d2ac 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1843,10 +1843,35 @@ static int dsi_populate_dsc_params(struct msm_dsi_h= ost *msm_host, struct drm_dsc drm_dsc_set_const_params(dsc); drm_dsc_set_rc_buf_thresh(dsc); =20 - /* DPU supports only pre-SCR panels */ - ret =3D drm_dsc_setup_rc_params(dsc, DRM_DSC_1_1_PRE_SCR); + if (dsc->dsc_version_major !=3D 1) { + DRM_DEV_ERROR(&msm_host->pdev->dev, "Unsupported DSC version: %x.%x\n", + dsc->dsc_version_major, dsc->dsc_version_minor); + return -EOPNOTSUPP; + } + + switch (dsc->dsc_version_minor) { + case 1: + /* + * For DSC1.1. the upstream lacks SCR parameters, the downstream + * parameters are unverified here, we support pre-SCR only. + */ + ret =3D drm_dsc_setup_rc_params(dsc, DRM_DSC_1_1_PRE_SCR); + break; + case 2: + if (dsc->native_422) + ret =3D drm_dsc_setup_rc_params(dsc, DRM_DSC_1_2_422); + else if (dsc->native_420) + ret =3D drm_dsc_setup_rc_params(dsc, DRM_DSC_1_2_420); + else + ret =3D drm_dsc_setup_rc_params(dsc, DRM_DSC_1_2_444); + break; + default: + ret =3D -EOPNOTSUPP; + } + if (ret) { - DRM_DEV_ERROR(&msm_host->pdev->dev, "could not find DSC RC parameters\n"= ); + DRM_DEV_ERROR(&msm_host->pdev->dev, "could not find DSC RC parameters fo= r DSC version: %x.%x\n", + dsc->dsc_version_major, dsc->dsc_version_minor); return ret; } =20 --=20 2.53.0