Both MSM8956 and MSM8976 have MDSS 1.11 which doesn't support UBWC
(although they also have Adreno 510, which might support UBWC). Disable
UBWC support for those platforms.

Fixes: 1924272b9ce1 ("soc: qcom: Add UBWC config provider")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/soc/qcom/ubwc_config.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/ubwc_config.c b/drivers/soc/qcom/ubwc_config.c
index 689e333ae44308cec178ff343bf09cc89bf9fce4..15d373bff231d770e00fe0aee1b5a95c7b8a6305 100644
--- a/drivers/soc/qcom/ubwc_config.c
+++ b/drivers/soc/qcom/ubwc_config.c
@@ -230,9 +230,9 @@ static const struct of_device_id qcom_ubwc_configs[] __maybe_unused = {
 	{ .compatible = "qcom,msm8929", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8939", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8953", .data = &msm8937_data },
-	{ .compatible = "qcom,msm8956", .data = &msm8937_data },
+	{ .compatible = "qcom,msm8956", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8974", .data = &no_ubwc_data },
-	{ .compatible = "qcom,msm8976", .data = &msm8937_data },
+	{ .compatible = "qcom,msm8976", .data = &no_ubwc_data },
 	{ .compatible = "qcom,msm8996", .data = &msm8998_data },
 	{ .compatible = "qcom,msm8998", .data = &msm8998_data },
 	{ .compatible = "qcom,qcm2290", .data = &qcm2290_data, },

-- 
2.47.2

On 8/14/25 9:22 AM, Dmitry Baryshkov wrote:
> Both MSM8956 and MSM8976 have MDSS 1.11 which doesn't support UBWC
> (although they also have Adreno 510, which might support UBWC). Disable
> UBWC support for those platforms.
> 
> Fixes: 1924272b9ce1 ("soc: qcom: Add UBWC config provider")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

On Thu, Aug 14, 2025 at 11:25:16AM +0200, Konrad Dybcio wrote:
> On 8/14/25 9:22 AM, Dmitry Baryshkov wrote:
> > Both MSM8956 and MSM8976 have MDSS 1.11 which doesn't support UBWC
> > (although they also have Adreno 510, which might support UBWC). Disable
> > UBWC support for those platforms.
> > 
> > Fixes: 1924272b9ce1 ("soc: qcom: Add UBWC config provider")
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> > ---
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

I've posted this patch, but I'm a bit reluctant to merge it. These
targets should be able to use UBWC for GPU work, but then rewert to
linear for scanout buffers.

-- 
With best wishes
Dmitry