[PATCH 2/2] drm/i915/display: Print PICA version

[Matt Roper]

On Fri, Dec 08, 2023 at 06:31:37AM -0800, Lucas De Marchi wrote:
> The PICA_DEVICE_ID follows the same format as other GMD_ID registers
> (graphics, display and media). Currently the only use for it is
> informational for developers while checking the differences between
> machines with the same platform. Print the raw number as there's no need
> for the driver to check any of the fields.
> 
> In future this may change, but then the IP version in
> struct intel_display_runtime_info will need some refactor to allow
> keeping both the display engine and PICA versions.
> 
> Lastly, keeping the PICA version around in the display runtime info
> matches its current use. If that changes in future, then it may need
> to be moved to the device info.
> 
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display_device.c | 5 +++++
>  drivers/gpu/drm/i915/display/intel_display_device.h | 2 ++
>  drivers/gpu/drm/i915/i915_reg.h                     | 2 ++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
> index 5d1084a98b93..d9d1be008e4c 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_device.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_device.c
> @@ -956,6 +956,9 @@ static void __intel_display_device_info_runtime_init(struct drm_i915_private *i9
>  	BUILD_BUG_ON(BITS_PER_TYPE(display_runtime->cpu_transcoder_mask) < I915_MAX_TRANSCODERS);
>  	BUILD_BUG_ON(BITS_PER_TYPE(display_runtime->port_mask) < I915_MAX_PORTS);
>  
> +	if (HAS_GMD_ID(i915))
> +		display_runtime->pica_id = intel_de_read(i915, PICA_DEVICE_ID);
> +
>  	/* This covers both ULT and ULX */
>  	if (IS_HASWELL_ULT(i915) || IS_BROADWELL_ULT(i915))
>  		display_runtime->port_mask &= ~BIT(PORT_D);
> @@ -1124,6 +1127,8 @@ void intel_display_device_info_print(const struct intel_display_device_info *inf
>  {
>  	drm_printf(p, "display version: %u.%02u.%02u\n",
>  		   runtime->ip.ver, runtime->ip.rel, runtime->ip.step);
> +	if (runtime->pica_id)
> +		drm_printf(p, "PICA version: %#08x\n", runtime->pica_id);

The actual, expected PICA version number on most (all?) MTL devices will
be 0.0.  Should we make the condition here HAS_GMD_ID(i915) instead so
that we print the value whenever we read it?  That will also help us
notice if the PICA register is incorrectly 0 on LNL or later platforms
where it should have been non-zero.


Matt

>  
>  #define PRINT_FLAG(name) drm_printf(p, "%s: %s\n", #name, str_yes_no(info->name))
>  	DEV_INFO_DISPLAY_FOR_EACH_FLAG(PRINT_FLAG);
> diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
> index 79e9f1c3e241..f8a2ada1a4ec 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_device.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_device.h
> @@ -123,6 +123,8 @@ struct intel_display_runtime_info {
>  
>  	u8 fbc_mask;
>  
> +	u32 pica_id;
> +
>  	bool has_hdcp;
>  	bool has_dmc;
>  	bool has_dsc;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 27dc903f0553..9d70635508ae 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6362,6 +6362,8 @@ enum skl_power_gate {
>  #define  TCSS_DDI_STATUS_HPD_LIVE_STATUS_TBT	REG_BIT(1)
>  #define  TCSS_DDI_STATUS_HPD_LIVE_STATUS_ALT	REG_BIT(0)
>  
> +#define PICA_DEVICE_ID				_MMIO(0x16fe00)
> +
>  #define PRIMARY_SPI_TRIGGER			_MMIO(0x102040)
>  #define PRIMARY_SPI_ADDRESS			_MMIO(0x102080)
>  #define PRIMARY_SPI_REGIONID			_MMIO(0x102084)
> -- 
> 2.40.1
> 

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