[Intel-gfx] [PATCH v5 5/5] drm/i915/mtl: Update CHICKEN_TRANS* register addresses

[Matt Roper]

On Tue, Sep 13, 2022 at 11:33:41AM -0700, Radhakrishna Sripada wrote:
> From: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep at intel.com>
> 
> In Display version 14, Transcoder Chicken Registers have updated address.
> This patch performs checks to use the right register when required.
> 
> v2: Omit display version check in i915_reg.h(Jani)
> v3:
>  - Remove extra whitespace introduced
>  - Fix reg definitions for MTL_CHICKEN_TRANS(MattR)
> 
> Bspec: 34387, 50054
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 14 +++++++++++---
>  drivers/gpu/drm/i915/display/intel_dp_mst.c  |  5 ++++-
>  drivers/gpu/drm/i915/i915_reg.h              |  7 +++++++
>  3 files changed, 22 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index a0829dcfd6d3..e94a7e1d6fe6 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -620,7 +620,10 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
>  	if (!IS_I830(dev_priv))
>  		val &= ~PIPECONF_ENABLE;
>  
> -	if (DISPLAY_VER(dev_priv) >= 12)
> +	if (DISPLAY_VER(dev_priv) >= 14)
> +		intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(cpu_transcoder),
> +			     FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
> +	else if (DISPLAY_VER(dev_priv) >= 12)
>  		intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder),
>  			     FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
>  
> @@ -1840,7 +1843,9 @@ static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
>  {
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	i915_reg_t reg = CHICKEN_TRANS(crtc_state->cpu_transcoder);
> +	enum transcoder transcoder = crtc_state->cpu_transcoder;
> +	i915_reg_t reg = DISPLAY_VER(dev_priv) >= 14 ? MTL_CHICKEN_TRANS(transcoder) :
> +			 CHICKEN_TRANS(transcoder);
>  	u32 val;
>  
>  	val = intel_de_read(dev_priv, reg);
> @@ -4037,6 +4042,7 @@ static bool hsw_get_pipe_config(struct intel_crtc *crtc,
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>  	struct intel_display_power_domain_set power_domain_set = { };
> +	i915_reg_t reg;
>  	bool active;
>  	u32 tmp;
>  
> @@ -4128,7 +4134,9 @@ static bool hsw_get_pipe_config(struct intel_crtc *crtc,
>  	}
>  
>  	if (!transcoder_is_dsi(pipe_config->cpu_transcoder)) {
> -		tmp = intel_de_read(dev_priv, CHICKEN_TRANS(pipe_config->cpu_transcoder));
> +		reg = DISPLAY_VER(dev_priv) >= 14 ? MTL_CHICKEN_TRANS(pipe_config->cpu_transcoder) :
> +			CHICKEN_TRANS(pipe_config->cpu_transcoder);
> +		tmp = intel_de_read(dev_priv, reg);

Bikeshed:  I'm not sure if it's really worth adding a new local 'reg'
variable for this vs just writing

    tmp = intel_de_read(dev_priv, DISPLAY_VER(dev_priv) >= 14 ?                                    
                                  MTL_CHICKEN_TRANS(pipe_config->cpu_transcoder) :                           
                                  CHICKEN_TRANS(pipe_config->cpu_transcoder));                               

But up to you.  Either way,

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

>  
>  		pipe_config->framestart_delay = REG_FIELD_GET(HSW_FRAME_START_DELAY_MASK, tmp) + 1;
>  	} else {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index 5adfd226d6c4..03604a37931c 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -565,7 +565,10 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
>  	drm_dp_add_payload_part2(&intel_dp->mst_mgr, &state->base,
>  				 drm_atomic_get_mst_payload_state(mst_state, connector->port));
>  
> -	if (DISPLAY_VER(dev_priv) >= 12 && pipe_config->fec_enable)
> +	if (DISPLAY_VER(dev_priv) >= 14 && pipe_config->fec_enable)
> +		intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(trans), 0,
> +			     FECSTALL_DIS_DPTSTREAM_DPTTG);
> +	else if (DISPLAY_VER(dev_priv) >= 12 && pipe_config->fec_enable)
>  		intel_de_rmw(dev_priv, CHICKEN_TRANS(trans), 0,
>  			     FECSTALL_DIS_DPTSTREAM_DPTTG);
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index fc57f304c16e..acfcd155c8d0 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5728,6 +5728,13 @@
>  					    [TRANSCODER_B] = _CHICKEN_TRANS_B, \
>  					    [TRANSCODER_C] = _CHICKEN_TRANS_C, \
>  					    [TRANSCODER_D] = _CHICKEN_TRANS_D))
> +
> +#define _MTL_CHICKEN_TRANS_A	0x604e0
> +#define _MTL_CHICKEN_TRANS_B	0x614e0
> +#define MTL_CHICKEN_TRANS(trans)	_MMIO_TRANS((trans), \
> +						    _MTL_CHICKEN_TRANS_A, \
> +						    _MTL_CHICKEN_TRANS_B)
> +
>  #define  HSW_FRAME_START_DELAY_MASK	REG_GENMASK(28, 27)
>  #define  HSW_FRAME_START_DELAY(x)	REG_FIELD_PREP(HSW_FRAME_START_DELAY_MASK, x)
>  #define  VSC_DATA_SEL_SOFTWARE_CONTROL	REG_BIT(25) /* GLK */
> -- 
> 2.34.1
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation