drm/msm/dpu: Clear CTL_FETCH_PIPE_ACTIVE on mixer reset

Resetting mixers should also include resetting active fetch pipes.

Fixes: ae4d721 ("drm/msm/dpu: add an API to reset the encoder related hw blocks")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/651246/
Link: https://lore.kernel.org/r/20250430-b4-sm8750-display-v5-8-8cab30c3e4df@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Author: krzk

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -2194,6 +2194,9 @@ static void dpu_encoder_helper_reset_mixers(struct dpu_encoder_phys *phys_enc)
 		/* clear all blendstages */
 		if (ctl->ops.setup_blendstage)
 			ctl->ops.setup_blendstage(ctl, hw_mixer[i]->idx, NULL);
+
+		if (ctl->ops.set_active_fetch_pipes)
+			ctl->ops.set_active_fetch_pipes(ctl, NULL);
 	}
 }