linux-kernel - [PATCH v2 2/2] Revert "drm/msm/a6xx: Poll for GBIF unhalt status in hw

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Message-Id: <20240625-adreno_barriers-v2-2-c01f2ef4b62a@linaro.org>
Date: Tue, 25 Jun 2024 20:54:42 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Akhil P Oommen <quic_akhilpo@...cinc.com>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v2 2/2] Revert "drm/msm/a6xx: Poll for GBIF unhalt status
 in hw_init"

Commit c9707bcbd0f3 ("drm/msm/adreno: De-spaghettify the use of memory
barriers") made some fixups relating to write arrival, ensuring that
the GPU's memory interface has *really really really* been told to come
out of reset. That in turn rendered the hacky commit being reverted no
longer necessary.

Get rid of it.

This reverts commit b77532803d11f2b03efab2ebfd8c0061cd7f8b30.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 4083d0cad782..03e23eef5126 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -867,10 +867,6 @@ static int hw_init(struct msm_gpu *gpu)
 		gpu_read(gpu, REG_A6XX_RBBM_GBIF_HALT);
 	}
 
-	/* Some GPUs are stubborn and take their sweet time to unhalt GBIF! */
-	if (adreno_is_a7xx(adreno_gpu) && a6xx_has_gbif(adreno_gpu))
-		spin_until(!gpu_read(gpu, REG_A6XX_GBIF_HALT_ACK));
-
 	gpu_write(gpu, REG_A6XX_RBBM_SECVID_TSB_CNTL, 0);
 
 	if (adreno_is_a619_holi(adreno_gpu))

-- 
2.45.2