[PATCH v7 12/18] drm/i915/dsb: Add pipedmc dc balance enable/disable

[Jani Nikula]

On Tue, 24 Jun 2025, Mitul Golani <mitulkumar.ajitkumar.golani at intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Add function to control DC balance enable/disable bit via DSB.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
> Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dmc.c | 18 ++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_dmc.h |  5 +++++
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
> index 4572e87d9bfa..1726c0ab18c2 100644
> --- a/drivers/gpu/drm/i915/display/intel_dmc.c
> +++ b/drivers/gpu/drm/i915/display/intel_dmc.c
> @@ -1607,3 +1607,21 @@ void intel_pipedmc_irq_handler(struct intel_display *display, enum pipe pipe)
>  		drm_err(display->drm, "[CRTC:%d:%s]] PIPEDMC interrupt vector 0x%x\n",
>  			crtc->base.base.id, crtc->base.name, tmp);
>  }
> +
> +void intel_pipedmc_dcb_enable(struct intel_dsb *dsb, struct intel_crtc *crtc)
> +{
> +	struct intel_display *display = to_intel_display(crtc);
> +	enum pipe pipe = crtc->pipe;
> +
> +	intel_de_write_dsb(display, dsb, PIPEDMC_DCB_CTL(pipe),
> +			   PIPEDMC_ADAPTIVE_DCB_ENABLE);
> +}
> +
> +void intel_pipedmc_dcb_disable(struct intel_dsb *dsb, struct intel_crtc *crtc)
> +{
> +	struct intel_display *display = to_intel_display(crtc);
> +	enum pipe pipe = crtc->pipe;
> +
> +	intel_de_write_dsb(display, dsb, PIPEDMC_DCB_CTL(pipe), 0);
> +}
> +
> diff --git a/drivers/gpu/drm/i915/display/intel_dmc.h b/drivers/gpu/drm/i915/display/intel_dmc.h
> index 7820fa5aed3e..d45d51bedb87 100644
> --- a/drivers/gpu/drm/i915/display/intel_dmc.h
> +++ b/drivers/gpu/drm/i915/display/intel_dmc.h
> @@ -8,11 +8,14 @@
>  
>  #include <linux/types.h>
>  
> +

Please run checkpatch before sending.

>  enum pipe;
> +struct intel_crtc;
>  struct drm_printer;
>  struct intel_crtc_state;
>  struct intel_display;
>  struct intel_dmc_snapshot;
> +struct intel_dsb;
>  
>  void intel_dmc_init(struct intel_display *display);
>  void intel_dmc_load_program(struct intel_display *display);
> @@ -36,5 +39,7 @@ void intel_dmc_update_dc6_allowed_count(struct intel_display *display, bool star
>  void assert_main_dmc_loaded(struct intel_display *display);
>  
>  void intel_pipedmc_irq_handler(struct intel_display *display, enum pipe pipe);
> +void intel_pipedmc_dcb_enable(struct intel_dsb *dsb, struct intel_crtc *crtc);
> +void intel_pipedmc_dcb_disable(struct intel_dsb *dsb, struct intel_crtc *crtc);
>  
>  #endif /* __INTEL_DMC_H__ */

-- 
Jani Nikula, Intel