diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 6163990a4d09d..ec8e043c9d383 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1252,6 +1252,7 @@ static void a5xx_fault_detect_irq(struct msm_gpu *gpu)
 
 static irqreturn_t a5xx_irq(struct msm_gpu *gpu)
 {
+	struct msm_drm_private *priv = gpu->dev->dev_private;
 	u32 status = gpu_read(gpu, REG_A5XX_RBBM_INT_0_STATUS);
 
 	/*
@@ -1261,6 +1262,11 @@ static irqreturn_t a5xx_irq(struct msm_gpu *gpu)
 	gpu_write(gpu, REG_A5XX_RBBM_INT_CLEAR_CMD,
 		status & ~A5XX_RBBM_INT_0_MASK_RBBM_AHB_ERROR);
 
+	if (priv->disable_err_irq) {
+		status &= A5XX_RBBM_INT_0_MASK_CP_CACHE_FLUSH_TS |
+			  A5XX_RBBM_INT_0_MASK_CP_SW;
+	}
+
 	/* Pass status to a5xx_rbbm_err_irq because we've already cleared it */
 	if (status & RBBM_ERROR_MASK)
 		a5xx_rbbm_err_irq(gpu, status);
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 507222806d60c..e7c77b61684de 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1373,10 +1373,14 @@ static void a6xx_fault_detect_irq(struct msm_gpu *gpu)
 
 static irqreturn_t a6xx_irq(struct msm_gpu *gpu)
 {
+	struct msm_drm_private *priv = gpu->dev->dev_private;
 	u32 status = gpu_read(gpu, REG_A6XX_RBBM_INT_0_STATUS);
 
 	gpu_write(gpu, REG_A6XX_RBBM_INT_CLEAR_CMD, status);
 
+	if (priv->disable_err_irq)
+		status &= A6XX_RBBM_INT_0_MASK_CP_CACHE_FLUSH_TS;
+
 	if (status & A6XX_RBBM_INT_0_MASK_RBBM_HANG_DETECT)
 		a6xx_fault_detect_irq(gpu);
 
diff --git a/drivers/gpu/drm/msm/msm_debugfs.c b/drivers/gpu/drm/msm/msm_debugfs.c
index 6a99e8b5d25d9..956b1efc37214 100644
--- a/drivers/gpu/drm/msm/msm_debugfs.c
+++ b/drivers/gpu/drm/msm/msm_debugfs.c
@@ -242,6 +242,9 @@ void msm_debugfs_init(struct drm_minor *minor)
 	debugfs_create_u32("hangcheck_period_ms", 0600, minor->debugfs_root,
 		&priv->hangcheck_period);
 
+	debugfs_create_bool("disable_err_irq", 0600, minor->debugfs_root,
+		&priv->disable_err_irq);
+
 	debugfs_create_file("shrink", S_IRWXU, minor->debugfs_root,
 		dev, &shrink_fops);
 
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 3f5fcf6d439e8..b24bc501c2310 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -240,6 +240,15 @@ struct msm_drm_private {
 
 	/* For hang detection, in ms */
 	unsigned int hangcheck_period;
+
+	/**
+	 * disable_err_irq:
+	 *
+	 * Disable handling of GPU hw error interrupts, to force fallback to
+	 * sw hangcheck timer.  Written (via debugfs) by igt tests to test
+	 * the sw hangcheck mechanism.
+	 */
+	bool disable_err_irq;
 };
 
 struct msm_format {