linux-kernel - [PATCH] drm/msm/a6xx: Avoid gx gbit halt during rpm suspend

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Message-ID: <20221216223253.1.Ice9c47bfeb1fddb8dc377a3491a043a3ee7fca7d@changeid>
Date:   Fri, 16 Dec 2022 22:33:14 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     freedreno <freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>
CC:     Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/msm/a6xx: Avoid gx gbit halt during rpm suspend

As per the downstream driver, gx gbif halt is required only during
recovery sequence. So lets avoid it during regular rpm suspend.

Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
---

 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 15 +++++++++------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c |  7 +++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  1 +
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index e033d6a67a20..870252bef23f 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -876,7 +876,8 @@ static void a6xx_gmu_rpmh_off(struct a6xx_gmu *gmu)
 #define GBIF_CLIENT_HALT_MASK             BIT(0)
 #define GBIF_ARB_HALT_MASK                BIT(1)
 
-static void a6xx_bus_clear_pending_transactions(struct adreno_gpu *adreno_gpu)
+static void a6xx_bus_clear_pending_transactions(struct adreno_gpu *adreno_gpu,
+		bool gx_off)
 {
 	struct msm_gpu *gpu = &adreno_gpu->base;
 
@@ -889,9 +890,11 @@ static void a6xx_bus_clear_pending_transactions(struct adreno_gpu *adreno_gpu)
 		return;
 	}
 
-	/* Halt the gx side of GBIF */
-	gpu_write(gpu, REG_A6XX_RBBM_GBIF_HALT, 1);
-	spin_until(gpu_read(gpu, REG_A6XX_RBBM_GBIF_HALT_ACK) & 1);
+	if (gx_off) {
+		/* Halt the gx side of GBIF */
+		gpu_write(gpu, REG_A6XX_RBBM_GBIF_HALT, 1);
+		spin_until(gpu_read(gpu, REG_A6XX_RBBM_GBIF_HALT_ACK) & 1);
+	}
 
 	/* Halt new client requests on GBIF */
 	gpu_write(gpu, REG_A6XX_GBIF_HALT, GBIF_CLIENT_HALT_MASK);
@@ -929,7 +932,7 @@ static void a6xx_gmu_force_off(struct a6xx_gmu *gmu)
 	/* Halt the gmu cm3 core */
 	gmu_write(gmu, REG_A6XX_GMU_CM3_SYSRESET, 1);
 
-	a6xx_bus_clear_pending_transactions(adreno_gpu);
+	a6xx_bus_clear_pending_transactions(adreno_gpu, true);
 
 	/* Reset GPU core blocks */
 	gpu_write(gpu, REG_A6XX_RBBM_SW_RESET_CMD, 1);
@@ -1083,7 +1086,7 @@ static void a6xx_gmu_shutdown(struct a6xx_gmu *gmu)
 			return;
 		}
 
-		a6xx_bus_clear_pending_transactions(adreno_gpu);
+		a6xx_bus_clear_pending_transactions(adreno_gpu, a6xx_gpu->hung);
 
 		/* tell the GMU we want to slumber */
 		ret = a6xx_gmu_notify_slumber(gmu);
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index e495d8e192db..cdce27adbd03 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1270,6 +1270,12 @@ static void a6xx_recover(struct msm_gpu *gpu)
 	if (hang_debug)
 		a6xx_dump(gpu);
 
+	/*
+	 * To handle recovery specific sequences during the rpm suspend we are
+	 * about to trigger
+	 */
+	a6xx_gpu->hung = true;
+
 	/* Halt SQE first */
 	gpu_write(gpu, REG_A6XX_CP_SQE_CNTL, 3);
 
@@ -1312,6 +1318,7 @@ static void a6xx_recover(struct msm_gpu *gpu)
 	mutex_unlock(&gpu->active_lock);
 
 	msm_gpu_hw_init(gpu);
+	a6xx_gpu->hung = false;
 }
 
 static const char *a6xx_uche_fault_block(struct msm_gpu *gpu, u32 mid)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
index ab853f61db63..eea2e60ce3b7 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
@@ -32,6 +32,7 @@ struct a6xx_gpu {
 	void *llc_slice;
 	void *htw_llc_slice;
 	bool have_mmu500;
+	bool hung;
 };
 
 #define to_a6xx_gpu(x) container_of(x, struct a6xx_gpu, base)
-- 
2.7.4