On Thu, Dec 05, 2024 at 08:31:54PM -0800, Abhinav Kumar wrote:
> As required by the hardware programming guide, always program
> the MST_FIFO_CONSTANT_FILL for MST use-cases.
>
> Signed-off-by: Abhinav Kumar <quic_abhin...@quicinc.com>
> ---
> drivers/gpu/drm/msm/dp/dp_catalog.c | 24 ++++++++++++++++++++++++
> drivers/gpu/drm/msm/dp/dp_catalog.h | 1 +
> drivers/gpu/drm/msm/dp/dp_ctrl.c | 3 +++
> 3 files changed, 28 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c
> b/drivers/gpu/drm/msm/dp/dp_catalog.c
> index
> 4826a698979ce7c37112812299879411c5743fa9..3cfa9fd0c6f5e664a65e6d9b74e5c9f22ad711f2
> 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> @@ -1009,6 +1009,30 @@ int msm_dp_catalog_panel_timing_cfg(struct
> msm_dp_catalog *msm_dp_catalog, u32 t
> return 0;
> }
>
> +int msm_dp_catalog_mst_async_fifo(struct msm_dp_catalog *msm_dp_catalog)
> +{
> + struct msm_dp_catalog_private *catalog = container_of(msm_dp_catalog,
> + struct
> msm_dp_catalog_private,
> + msm_dp_catalog);
> +
> + u32 reg;
> +
> + if (msm_dp_catalog->stream_id == DP_STREAM_0)
> + reg = msm_dp_read_p0(catalog, MMSS_DP_ASYNC_FIFO_CONFIG);
> + else
> + reg = msm_dp_read_p1(catalog, MMSS_DP_ASYNC_FIFO_CONFIG);
> +
> + /* enable MST_FIFO_CONSTANT_FILL */
> + reg |= BIT(0);
#define
> +
> + if (msm_dp_catalog->stream_id == DP_STREAM_0)
> + msm_dp_write_p0(catalog, MMSS_DP_ASYNC_FIFO_CONFIG, reg);
> + else
> + msm_dp_write_p1(catalog, MMSS_DP_ASYNC_FIFO_CONFIG, reg);
> +
> + return 0;
> +}
> +
> static void msm_dp_catalog_panel_send_vsc_sdp(struct msm_dp_catalog
> *msm_dp_catalog, struct dp_sdp *vsc_sdp)
> {
> struct msm_dp_catalog_private *catalog;
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h
> b/drivers/gpu/drm/msm/dp/dp_catalog.h
> index
> 323858c587f85996d296156c7b8b201cdb7b7eb4..0025ecc0adb2f351c44f10af82332a6622749416
> 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
> @@ -150,5 +150,6 @@ void msm_dp_catalog_mst_channel_alloc(struct
> msm_dp_catalog *ctrl,
> u32 ch, u32 ch_start_slot, u32
> tot_slot_cnt);
> void msm_dp_catalog_ctrl_update_rg(struct msm_dp_catalog *ctrl, u32 stream,
> u32 x_int, u32 y_frac_enum);
> +int msm_dp_catalog_mst_async_fifo(struct msm_dp_catalog *dp_catalog);
>
> #endif /* _DP_CATALOG_H_ */
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index
> 2288c379283c721a01c81302f8d307d0b3c76527..d4915a962f97b3d2a347456e197265a5dc043eb0
> 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -236,6 +236,9 @@ static void msm_dp_ctrl_configure_source_params(struct
> msm_dp_ctrl_private *ctrl
> cc = msm_dp_link_get_colorimetry_config(ctrl->link);
> msm_dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb);
> msm_dp_panel_timing_cfg(msm_dp_panel);
> +
> + if (ctrl->mst_active)
> + msm_dp_catalog_mst_async_fifo(ctrl->catalog);
Should it be disabled further on in a non-MST case?
> }
>
> /*
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
