[Intel-gfx] [PATCH] drm/i915/dmc: Load DMC on MTL

[Matt Roper]

On Thu, Mar 02, 2023 at 12:05:50PM -0300, Gustavo Sousa wrote:
> From: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep at intel.com>
> 
> Add support to load DMC on MTL.
> 
> Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep at intel.com>
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dmc.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
> index f70ada2357dc..dedf40cb85a2 100644
> --- a/drivers/gpu/drm/i915/display/intel_dmc.c
> +++ b/drivers/gpu/drm/i915/display/intel_dmc.c
> @@ -60,6 +60,10 @@
>  
>  #define DISPLAY_VER12_DMC_MAX_FW_SIZE	ICL_DMC_MAX_FW_SIZE
>  
> +#define MTL_DMC_PATH			DMC_PATH(mtl)
> +#define MTL_DMC_MAX_FW_SIZE		0x10000

Is there a reference somewhere in the bspec for the max DMC payload
size?  It seems unusual that it would have reduced from ADL to MTL,
although the payloads in the current firmware do indeed fit within this
reduced limit.


Matt

> +MODULE_FIRMWARE(MTL_DMC_PATH);
> +
>  #define DG2_DMC_PATH			DMC_LEGACY_PATH(dg2, 2, 08)
>  MODULE_FIRMWARE(DG2_DMC_PATH);
>  
> @@ -943,7 +947,10 @@ void intel_dmc_init(struct drm_i915_private *dev_priv)
>  	 */
>  	intel_dmc_runtime_pm_get(dev_priv);
>  
> -	if (IS_DG2(dev_priv)) {
> +	if (IS_METEORLAKE(dev_priv)) {
> +		dmc->fw_path = MTL_DMC_PATH;
> +		dmc->max_fw_size = MTL_DMC_MAX_FW_SIZE;
> +	} else if (IS_DG2(dev_priv)) {
>  		dmc->fw_path = DG2_DMC_PATH;
>  		dmc->max_fw_size = DISPLAY_VER13_DMC_MAX_FW_SIZE;
>  	} else if (IS_ALDERLAKE_P(dev_priv)) {
> -- 
> 2.39.2
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation