Re: [PATCH] drm/i915/mtl: Check full IP version when applying hw steering semaphore

[Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>]

On Fri, Dec 02, 2022 at 02:35:28PM -0800, Matt Roper wrote:
> When determining whether the platform has a hardware-level steering
> semaphore (i.e., MTL and beyond), we need to use GRAPHICS_VER_FULL() to
> compare the full version rather than just the major version number
> returned by GRAPHICS_VER().
> 
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Fixes: 3100240bf846 ("drm/i915/mtl: Add hardware-level lock for steering")
> Cc: Balasubramani Vivekanandan <balasubramani.vivekanandan@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/gt/intel_gt_mcr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> index 087e4ac5b68d..41a237509dcf 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> @@ -367,7 +367,7 @@ void intel_gt_mcr_lock(struct intel_gt *gt, unsigned long *flags)
>  	 * driver threads, but also with hardware/firmware agents.  A dedicated
>  	 * locking register is used.
>  	 */
> -	if (GRAPHICS_VER(gt->i915) >= IP_VER(12, 70))
> +	if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70))
>  		err = wait_for(intel_uncore_read_fw(gt->uncore,
>  						    MTL_STEER_SEMAPHORE) == 0x1, 100);
>  
> @@ -407,7 +407,7 @@ void intel_gt_mcr_unlock(struct intel_gt *gt, unsigned long flags)
>  {
>  	spin_unlock_irqrestore(&gt->mcr_lock, flags);
>  
> -	if (GRAPHICS_VER(gt->i915) >= IP_VER(12, 70))
> +	if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70))
>  		intel_uncore_write_fw(gt->uncore, MTL_STEER_SEMAPHORE, 0x1);
>  }
>  
> -- 
> 2.38.1
>