[Intel-gfx] [PATCH] drm/i915/gt: skip WA verfication for GEN7_MISCCPCTL on DG2

[Nirmoy Das]

On 9/12/2023 9:35 AM, Andrzej Hajda wrote:
> Some DG2 firmware locks this register for modification. Using wa_add
> with read_mask 0 allows to skip checks of such registers.
>
> Signed-off-by: Andrzej Hajda <andrzej.hajda at intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>
> ---
>   drivers/gpu/drm/i915/gt/intel_workarounds.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 70071ead0659cc..1d1474ad945e0c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -1597,8 +1597,11 @@ dg2_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
>   	/* Wa_14014830051:dg2 */
>   	wa_mcr_write_clr(wal, SARB_CHICKEN1, COMP_CKN_IN);
>   
> -	/* Wa_14015795083 */
> -	wa_write_clr(wal, GEN7_MISCCPCTL, GEN12_DOP_CLOCK_GATE_RENDER_ENABLE);
> +	/* Wa_14015795083
> +	 * Skip verification for possibly locked register.
> +	 */
> +	wa_add(wal, GEN7_MISCCPCTL, GEN12_DOP_CLOCK_GATE_RENDER_ENABLE,
> +	       0, 0, false);
>   
>   	/* Wa_18018781329 */
>   	wa_mcr_write_or(wal, RENDER_MOD_CTRL, FORCE_MISS_FTLB);