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[2001:14ba:a073:af00:264b:feff:fe8b:be8a]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-38384dbec4dsm29636391fa.20.2026.01.19.00.17.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Jan 2026 00:17:17 -0800 (PST) From: Dmitry Baryshkov Date: Mon, 19 Jan 2026 10:17:14 +0200 Subject: [PATCH v3 1/4] drm/msm/mdss: correct HBB programmed on UBWC 5.x and 6.x devices Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260119-msm-ubwc-fixes-v3-1-34aaa672c829@oss.qualcomm.com> References: <20260119-msm-ubwc-fixes-v3-0-34aaa672c829@oss.qualcomm.com> In-Reply-To: <20260119-msm-ubwc-fixes-v3-0-34aaa672c829@oss.qualcomm.com> To: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Konrad Dybcio , Konrad Dybcio , Vinod Koul , Stephan Gerhold Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Val Packett X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1187; i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id; bh=rvlLamNB1d8AxWI8yQdhDfj/WRXPqvKE6wjpg+ZGkfw=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBpbeiLRc6MfZfjLwLgU9ZLO+AmHQLpKNEG53lTe uFIrNKomZ6JATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCaW3oiwAKCRCLPIo+Aiko 1ZiYCACKIFBdBuVY28Simiz9YBlSWLg7vfCkIdbVslZHYkeWy+BmVuv0O1Ne8FFUiw3KIWTX1C+ Blz4BoZakElqDCeCKgu/N63/gkM5NPFytkeUQ4cHgHtcceXl4bG47umALc9V1NJAfM1tDOb5/0c VX7JYAynZSWnkpn//AVfb4bweJ/n71hPBkUZWjtO8+BI6A4c5FCLxyw+hfAhkEyFzj99A6JIX52 mNtQgQuTjMgV9j9EekWH2LxvKeWItXo9Kr/LhQQZjCPCye24ph6NJAQZmEk83C5w7/e2f88sbUO TP0dvVar7Di6T9yZf38+ThRugmLsSv25DeTeKGA8k15VJmcQ X-Developer-Key: i=dmitry.baryshkov@oss.qualcomm.com; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE5MDA2NyBTYWx0ZWRfX1D1h7KQbvIy8 cps48qDtIfjxc/iKjcDmSa2j6qZJQ9Ak4WGiDGA62870wqpTHetTLVvNyvu5NEWpV/WzdQAPdDf kDztiSG5PziF9fMZN5jEMRvEB/c2jHgp7M66Dd8FYFyBu5jY2+fJCPerHjaL6tDr+qyhueRhklb zo9IHBbWAe+rkrMYz/CnNC0EcYjxsY9H9zJ6RCmcOWItvP8Uj6CvFbGlX/FUqrach2t/I89DVdq CMPCmmLFdg9bXGZ9N5rWttY5NLaH9PzNNdEnC7Z29FJETC9WCXGDccG8OrmMvrtaDQU8gjhTPyr fdA8537ebFzlaLKbFCbvtpYse8/i7vkQsKp9Ajv5AYbsCpsbpK6mffF/+9voQ1G4RSkXf/Zf+Sd r2q7qViUYciHSEgJT8Tp+/RF9w74umzY6pk/8peVfAYkSjSgtGJpeJqzGYgcMJYKMJGK+Gvqsrh AMwpMry7698lOjChafw== X-Authority-Analysis: v=2.4 cv=Sev6t/Ru c=1 sm=1 tr=0 ts=696de890 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=VBuLEOLxEfejlaYavu0A:9 a=+jEqtf1s3R9VXZ0wqowq2kgwd+I=:19 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-GUID: OyazbIyVNTzUiIiT-bCI-jLMlZuPKZod X-Proofpoint-ORIG-GUID: OyazbIyVNTzUiIiT-bCI-jLMlZuPKZod X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-19_01,2026-01-19_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 adultscore=0 impostorscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601190067 As in the previous generations, on UBWC 5.x and 6.x devices the Highest Bank Bit value should be programmed into the hardware with the offset of -13. Correct the value written into the register to prevent unpredictable results. Fixes: 227d4ce0b09e ("drm/msm: Offset MDSS HBB value by 13") Tested-by: Val Packett # x1e80100-dell-latitude-7455 Signed-off-by: Dmitry Baryshkov Reviewed-by: Konrad Dybcio --- drivers/gpu/drm/msm/msm_mdss.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c index bf9a33e925ac..910242f5a71f 100644 --- a/drivers/gpu/drm/msm/msm_mdss.c +++ b/drivers/gpu/drm/msm/msm_mdss.c @@ -229,7 +229,7 @@ static void msm_mdss_setup_ubwc_dec_50(struct msm_mdss = *msm_mdss) { const struct qcom_ubwc_cfg_data *data =3D msm_mdss->mdss_data; u32 value =3D MDSS_UBWC_STATIC_UBWC_SWIZZLE(data->ubwc_swizzle) | - MDSS_UBWC_STATIC_HIGHEST_BANK_BIT(data->highest_bank_bit); + MDSS_UBWC_STATIC_HIGHEST_BANK_BIT(data->highest_bank_bit - 13); =20 if (data->ubwc_bank_spread) value |=3D MDSS_UBWC_STATIC_UBWC_BANK_SPREAD; --=20 2.47.3