openwrt/target/linux/bcm27xx/patches-5.4/950-0269-drm-v3d-HACK-gut-runtime-pm-for-now.patch

From ba05797f8e3578398a1ab6c835f6b100d4f46edb Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Mon, 14 Jan 2019 15:13:17 -0800
Subject: [PATCH] drm/v3d: HACK: gut runtime pm for now.

Something is still unstable -- on starting a new glxgears from an idle
X11, I get an MMU violation in high addresses.  The CTS also failed
quite quickly.  With this, CTS progresses for an hour before OOMing
(allocating some big buffers when my board only has 600MB available to
Linux)

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/gpu/drm/v3d/v3d_debugfs.c | 16 +---------------
 drivers/gpu/drm/v3d/v3d_drv.c     |  9 ---------
 2 files changed, 1 insertion(+), 24 deletions(-)

--- a/drivers/gpu/drm/v3d/v3d_debugfs.c
+++ b/drivers/gpu/drm/v3d/v3d_debugfs.c
@@ -4,7 +4,6 @@
 #include <linux/circ_buf.h>
 #include <linux/ctype.h>
 #include <linux/debugfs.h>
-#include <linux/pm_runtime.h>
 #include <linux/seq_file.h>
 
 #include <drm/drm_debugfs.h>
@@ -130,11 +129,8 @@ static int v3d_v3d_debugfs_ident(struct
 	struct drm_device *dev = node->minor->dev;
 	struct v3d_dev *v3d = to_v3d_dev(dev);
 	u32 ident0, ident1, ident2, ident3, cores;
-	int ret, core;
+	int core;
 
-	ret = pm_runtime_get_sync(v3d->dev);
-	if (ret < 0)
-		return ret;
 
 	ident0 = V3D_READ(V3D_HUB_IDENT0);
 	ident1 = V3D_READ(V3D_HUB_IDENT1);
@@ -187,9 +183,6 @@ static int v3d_v3d_debugfs_ident(struct
 			   (misccfg & V3D_MISCCFG_OVRTMUOUT) != 0);
 	}
 
-	pm_runtime_mark_last_busy(v3d->dev);
-	pm_runtime_put_autosuspend(v3d->dev);
-
 	return 0;
 }
 
@@ -217,11 +210,6 @@ static int v3d_measure_clock(struct seq_
 	uint32_t cycles;
 	int core = 0;
 	int measure_ms = 1000;
-	int ret;
-
-	ret = pm_runtime_get_sync(v3d->dev);
-	if (ret < 0)
-		return ret;
 
 	if (v3d->ver >= 40) {
 		V3D_CORE_WRITE(core, V3D_V4_PCTR_0_SRC_0_3,
@@ -245,8 +233,6 @@ static int v3d_measure_clock(struct seq_
 		   cycles / (measure_ms * 1000),
 		   (cycles / (measure_ms * 100)) % 10);
 
-	pm_runtime_mark_last_busy(v3d->dev);
-	pm_runtime_put_autosuspend(v3d->dev);
 
 	return 0;
 }
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -78,7 +78,6 @@ static int v3d_get_param_ioctl(struct dr
 {
 	struct v3d_dev *v3d = to_v3d_dev(dev);
 	struct drm_v3d_get_param *args = data;
-	int ret;
 	static const u32 reg_map[] = {
 		[DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG,
 		[DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1,
@@ -104,17 +103,12 @@ static int v3d_get_param_ioctl(struct dr
 		if (args->value != 0)
 			return -EINVAL;
 
-		ret = pm_runtime_get_sync(v3d->dev);
-		if (ret < 0)
-			return ret;
 		if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
 		    args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
 			args->value = V3D_CORE_READ(0, offset);
 		} else {
 			args->value = V3D_READ(offset);
 		}
-		pm_runtime_mark_last_busy(v3d->dev);
-		pm_runtime_put_autosuspend(v3d->dev);
 		return 0;
 	}
 
@@ -302,9 +296,6 @@ static int v3d_platform_drm_probe(struct
 		goto dev_free;
 	}
 
-	pm_runtime_use_autosuspend(dev);
-	pm_runtime_set_autosuspend_delay(dev, 50);
-	pm_runtime_enable(dev);
 
 	ret = drm_dev_init(&v3d->drm, &v3d_drm_driver, dev);
 	if (ret)