Re: [PATCH v2 02/10] drm/nouveau/disp: move the GSP HDMI GCP AVMute write to engine/disp

[lyude@redhat.com]

Reviewed-by: Lyude Paul <lyude@redhat.com>

On Thu, 2026-08-20 at 20:49 +0400, Mohamed Ahmed wrote:
> r535_sor_hdmi_audio() pairs two RM controls (a SET_OD_PACKET carrying
> the same General Control Packet, and the audio mute-stream toggle)
> with a direct write of the GCP AVMute bit through the SF GCP unit.
> The controls are RM and stay, but the direct write is register
> programming and moves next to the other per-chip display code as
> tu102_sor_hdmi_gcp(). No functional change.
> 
> Signed-off-by: Mohamed Ahmed <mohamedahmedegypt2001@gmail.com>
> ---
>  drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h    |  1 +
>  drivers/gpu/drm/nouveau/nvkm/engine/disp/tu102.c  | 15
> +++++++++++++++
>  .../drm/nouveau/nvkm/subdev/gsp/rm/r535/disp.c    |  9 +--------
>  3 files changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
> b/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
> index 3ba04bead2f9..5d682a774f2d 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
> @@ -194,6 +194,7 @@ void gv100_sor_dp_audio_sym(struct nvkm_ior *,
> int, u16, u32);
>  void gv100_sor_dp_watermark(struct nvkm_ior *, int, u8);
>  extern const struct nvkm_ior_func_hda gv100_sor_hda;
>  
> +void tu102_sor_hdmi_gcp(struct nvkm_ior *, int, bool);
>  void tu102_sor_dp_vcpi(struct nvkm_ior *, int, u8, u8, u16, u16);
>  
>  int nv50_pior_cnt(struct nvkm_disp *, unsigned long *);
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/tu102.c
> b/drivers/gpu/drm/nouveau/nvkm/engine/disp/tu102.c
> index 7b70b466fa36..6cfd52c9056f 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/tu102.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/tu102.c
> @@ -30,6 +30,21 @@
>  
>  #include <nvif/class.h>
>  
> +/* General Control Packet: bracket an audio enable/disable with
> AVMute
> + * through the legacy GCP SF unit. Used by the GSP-RM path, which
> sends the
> + * equivalent packet via RM as well but keeps the direct write in
> sync.
> + */
> +void
> +tu102_sor_hdmi_gcp(struct nvkm_ior *sor, int head, bool enable)
> +{
> +	struct nvkm_device *device = sor->disp-
> >engine.subdev.device;
> +	const u32 hdmi = head * 0x400;
> +
> +	nvkm_mask(device, 0x6f00c0 + hdmi, 0x00000001, 0x00000000);
> +	nvkm_wr32(device, 0x6f00cc + hdmi, !enable ? 0x00000001 :
> 0x00000010);
> +	nvkm_mask(device, 0x6f00c0 + hdmi, 0x00000001, 0x00000001);
> +}
> +
>  void
>  tu102_sor_dp_vcpi(struct nvkm_ior *sor, int head, u8 slot, u8
> slot_nr, u16 pbn, u16 aligned)
>  {
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/disp.c
> b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/disp.c
> index 8e57bb6519e5..cd4451e62512 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/disp.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/disp.c
> @@ -545,16 +545,9 @@ r535_sor_hdmi_ctrl_audio(struct nvkm_outp *outp,
> bool enable)
>  static void
>  r535_sor_hdmi_audio(struct nvkm_ior *sor, int head, bool enable)
>  {
> -	struct nvkm_device *device = sor->disp-
> >engine.subdev.device;
> -	const u32 hdmi = head * 0x400;
> -
>  	r535_sor_hdmi_ctrl_audio(sor->asy.outp, enable);
>  	r535_sor_hdmi_ctrl_audio_mute(sor->asy.outp, !enable);
> -
> -	/* General Control (GCP). */
> -	nvkm_mask(device, 0x6f00c0 + hdmi, 0x00000001, 0x00000000);
> -	nvkm_wr32(device, 0x6f00cc + hdmi, !enable ? 0x00000001 :
> 0x00000010);
> -	nvkm_mask(device, 0x6f00c0 + hdmi, 0x00000001, 0x00000001);
> +	tu102_sor_hdmi_gcp(sor, head, enable);
>  }
>  
>  static void