lkml.org 
[lkml]   [2020]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] panfrost: Make sure GPU is powered on when reading GPU_LATEST_FLUSH_ID
Date
Bifrost devices do support the flush reduction feature, so on first job
submit we were trying to read the register while still powered off.

If the GPU is powered off, the feature doesn't bring any benefit, so
don't try to read.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---
drivers/gpu/drm/panfrost/panfrost_gpu.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index f2c1ddc41a9b..e0f190e43813 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -10,6 +10,7 @@
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>

#include "panfrost_device.h"
#include "panfrost_features.h"
@@ -368,7 +369,16 @@ void panfrost_gpu_fini(struct panfrost_device *pfdev)

u32 panfrost_gpu_get_latest_flush_id(struct panfrost_device *pfdev)
{
- if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION))
- return gpu_read(pfdev, GPU_LATEST_FLUSH_ID);
+ u32 flush_id;
+
+ if (panfrost_has_hw_feature(pfdev, HW_FEATURE_FLUSH_REDUCTION)) {
+ /* Flush reduction only makes sense when the GPU is kept powered on between jobs */
+ if (pm_runtime_get_if_in_use(pfdev->dev)) {
+ flush_id = gpu_read(pfdev, GPU_LATEST_FLUSH_ID);
+ pm_runtime_put(pfdev->dev);
+ return flush_id;
+ }
+ }
+
return 0;
}
--
2.21.0
\
 
 \ /
  Last update: 2020-06-11 10:59    [W:0.072 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site