linux-kernel - [PATCH RFT v2 10/15] drm/msm/a6xx: Simplify min_acc

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Message-Id: <20250514-topic-ubwc_central-v2-10-09ecbc0a05ce@oss.qualcomm.com>
Date: Wed, 14 May 2025 17:10:30 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, 
 Akhil P Oommen <quic_akhilpo@...cinc.com>, Sean Paul <sean@...rly.run>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH RFT v2 10/15] drm/msm/a6xx: Simplify min_acc_len
 calculation

From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

It's only necessary for some lower end parts.
Also rename it to min_acc_len_64b to denote that if set, the minimum
access length is 64 bits, 32b otherwise.

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 5ee5f8dc90fe0d1647ce07b7dbcadc6ca2ecd416..fdc843c47c075a92ec8305217c355e4ccee876dc 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -592,14 +592,12 @@ static int a6xx_calc_ubwc_config(struct adreno_gpu *gpu)
 	if (IS_ERR(gpu->common_ubwc_cfg))
 		return -EINVAL;
 
-	gpu->ubwc_config.min_acc_len = 0;
 	gpu->ubwc_config.ubwc_swizzle = 0x6;
 	gpu->ubwc_config.macrotile_mode = 0;
 	gpu->ubwc_config.highest_bank_bit = 15;
 
 	if (adreno_is_a610(gpu)) {
 		gpu->ubwc_config.highest_bank_bit = 13;
-		gpu->ubwc_config.min_acc_len = 1;
 		gpu->ubwc_config.ubwc_swizzle = 0x7;
 	}
 
@@ -645,10 +643,8 @@ static int a6xx_calc_ubwc_config(struct adreno_gpu *gpu)
 		gpu->ubwc_config.macrotile_mode = 1;
 	}
 
-	if (adreno_is_a702(gpu)) {
+	if (adreno_is_a702(gpu))
 		gpu->ubwc_config.highest_bank_bit = 14;
-		gpu->ubwc_config.min_acc_len = 1;
-	}
 
 	return 0;
 }
@@ -657,6 +653,7 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	u8 uavflagprd_inv = adreno_is_a650_family(adreno_gpu) || adreno_is_a7xx(adreno_gpu) ? 2 : 0;
+	bool min_acc_len_64b = adreno_is_a610(adreno_gpu) || adreno_is_a702(adreno_gpu);
 	const struct qcom_ubwc_cfg_data *cfg = adreno_gpu->common_ubwc_cfg;
 	/*
 	 * We subtract 13 from the highest bank bit (13 is the minimum value
@@ -676,18 +673,18 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 		  level2_swizzling_dis << 12 |
 		  rgb565_predicator << 11 |
 		  hbb_hi << 10 | amsbc << 4 |
-		  adreno_gpu->ubwc_config.min_acc_len << 3 |
+		  min_acc_len_64b << 3 |
 		  hbb_lo << 1 | ubwc_mode);
 
 	gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL,
 		  level2_swizzling_dis << 6 | hbb_hi << 4 |
-		  adreno_gpu->ubwc_config.min_acc_len << 3 |
+		  min_acc_len_64b << 3 |
 		  hbb_lo << 1 | ubwc_mode);
 
 	gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL,
 		  level2_swizzling_dis << 12 | hbb_hi << 10 |
 		  uavflagprd_inv << 4 |
-		  adreno_gpu->ubwc_config.min_acc_len << 3 |
+		  min_acc_len_64b << 3 |
 		  hbb_lo << 1 | ubwc_mode);
 
 	if (adreno_is_a7xx(adreno_gpu))
@@ -695,7 +692,7 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 			  FIELD_PREP(GENMASK(8, 5), hbb_lo));
 
 	gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL,
-		  adreno_gpu->ubwc_config.min_acc_len << 23 | hbb_lo << 21);
+		  min_acc_len_64b << 23 | hbb_lo << 21);
 
 	gpu_write(gpu, REG_A6XX_RBBM_NC_MODE_CNTL,
 		  adreno_gpu->ubwc_config.macrotile_mode);

-- 
2.49.0