linux-kernel - [PATCH v4 04/14] drm/msm/a6xx: Extend and explain UBWC config

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Date:   Tue, 14 Mar 2023 16:28:35 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v4 04/14] drm/msm/a6xx: Extend and explain UBWC config

Rename lower_bit to hbb_lo and explain what it signifies.
Add explanations (wherever possible to other tunables).

Port setting min_access_length, ubwc_mode and hbb_hi from downstream.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 39 +++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index a849db8252f2..2f55dac52833 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -786,10 +786,25 @@ static void a6xx_set_cp_protect(struct msm_gpu *gpu)
 static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
-	u32 lower_bit = 2;
-	u32 amsbc = 0;
+	/* Unknown, introduced with A650 family, related to UBWC mode/ver 4 */
 	u32 rgb565_predicator = 0;
+	/* Unknown, introduced with A650 family */
 	u32 uavflagprd_inv = 0;
+	/* Whether the minimum access length is 64 bits */
+	u32 min_acc_len = 0;
+	/* Entirely magic, per-GPU-gen value */
+	u32 ubwc_mode = 0;
+	/*
+	 * The Highest Bank Bit value represents the bit of the highest DDR bank.
+	 * We then subtract 13 from it (13 is the minimum value allowed by hw) and
+	 * write the lowest two bits of the remaining value as hbb_lo and the
+	 * one above it as hbb_hi to the hardware. This should ideally use DRAM
+	 * type detection.
+	 */
+	u32 hbb_hi = 0;
+	u32 hbb_lo = 2;
+	/* Unknown, introduced with A640/680 */
+	u32 amsbc = 0;
 
 	/* a618 is using the hw default values */
 	if (adreno_is_a618(adreno_gpu))
@@ -800,25 +815,31 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 
 	if (adreno_is_a650(adreno_gpu) || adreno_is_a660(adreno_gpu)) {
 		/* TODO: get ddr type from bootloader and use 2 for LPDDR4 */
-		lower_bit = 3;
+		hbb_lo = 3;
 		amsbc = 1;
 		rgb565_predicator = 1;
 		uavflagprd_inv = 2;
 	}
 
 	if (adreno_is_7c3(adreno_gpu)) {
-		lower_bit = 1;
+		hbb_lo = 1;
 		amsbc = 1;
 		rgb565_predicator = 1;
 		uavflagprd_inv = 2;
 	}
 
 	gpu_write(gpu, REG_A6XX_RB_NC_MODE_CNTL,
-		rgb565_predicator << 11 | amsbc << 4 | lower_bit << 1);
-	gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL, lower_bit << 1);
-	gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL,
-		uavflagprd_inv << 4 | lower_bit << 1);
-	gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, lower_bit << 21);
+		  rgb565_predicator << 11 | hbb_hi << 10 | amsbc << 4 |
+		  min_acc_len << 3 | hbb_lo << 1 | ubwc_mode);
+
+	gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL, hbb_hi << 4 |
+		  min_acc_len << 3 | hbb_lo << 1 | ubwc_mode);
+
+	gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL, hbb_hi << 10 |
+		  uavflagprd_inv << 4 | min_acc_len << 3 |
+		  hbb_lo << 1 | ubwc_mode);
+
+	gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, min_acc_len << 23 | hbb_lo << 21);
 }
 
 static int a6xx_cp_init(struct msm_gpu *gpu)

-- 
2.39.2