[PATCH] soc: qcom: ubwc: provide no-UBWC configuration

[Robin Clark]

On Sun, Jul 6, 2025 at 4:01 AM Dmitry Baryshkov
<dmitry.baryshkov at oss.qualcomm.com> wrote:
>
> After the commit 45a2974157d2 ("drm/msm: Use the central UBWC config
> database") the MDSS driver errors out if UBWC database didn't provide it
> with the UBWC configuration. Make UBWC database return zero data for
> MSM8916 / APQ8016, MSM8974 / APQ8074, MSM8226 and MSM8939.
>
> Fixes: 1924272b9ce1 ("soc: qcom: Add UBWC config provider")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
> ---
> Note: the driver is a part of drivers/soc, but as it got merged through
> drm/msm tree, this fix should also go through the drm/msm tree.

Reviewed-by: Rob Clark <robin.clark at oss.qualcomm.com>

> ---
>  drivers/soc/qcom/ubwc_config.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/soc/qcom/ubwc_config.c b/drivers/soc/qcom/ubwc_config.c
> index bd0a98aad9f3b222abcf0a7af85a318caffa9841..df074520a8cae1a202a14ca094903bb1e7389066 100644
> --- a/drivers/soc/qcom/ubwc_config.c
> +++ b/drivers/soc/qcom/ubwc_config.c
> @@ -12,6 +12,10 @@
>
>  #include <linux/soc/qcom/ubwc.h>
>
> +static const struct qcom_ubwc_cfg_data no_ubwc_data = {
> +       /* no UBWC, no HBB */
> +};
> +
>  static const struct qcom_ubwc_cfg_data msm8937_data = {
>         .ubwc_enc_version = UBWC_1_0,
>         .ubwc_dec_version = UBWC_1_0,
> @@ -215,11 +219,17 @@ static const struct qcom_ubwc_cfg_data x1e80100_data = {
>  };
>
>  static const struct of_device_id qcom_ubwc_configs[] __maybe_unused = {
> +       { .compatible = "qcom,apq8016", .data = &no_ubwc_data },
> +       { .compatible = "qcom,apq8074", .data = &no_ubwc_data },
>         { .compatible = "qcom,apq8096", .data = &msm8998_data },
> +       { .compatible = "qcom,msm8226", .data = &no_ubwc_data },
> +       { .compatible = "qcom,msm8916", .data = &no_ubwc_data },
>         { .compatible = "qcom,msm8917", .data = &msm8937_data },
>         { .compatible = "qcom,msm8937", .data = &msm8937_data },
> +       { .compatible = "qcom,msm8939", .data = &no_ubwc_data },
>         { .compatible = "qcom,msm8953", .data = &msm8937_data },
>         { .compatible = "qcom,msm8956", .data = &msm8937_data },
> +       { .compatible = "qcom,msm8974", .data = &no_ubwc_data },
>         { .compatible = "qcom,msm8976", .data = &msm8937_data },
>         { .compatible = "qcom,msm8996", .data = &msm8998_data },
>         { .compatible = "qcom,msm8998", .data = &msm8998_data },
>
> ---
> base-commit: 8290d37ad2b087bbcfe65fa5bcaf260e184b250a
> change-id: 20250706-ubwc-no-ubwc-3c5919273e03
>
> Best regards,
> --
> With best wishes
> Dmitry
>