This is a note to let you know that I've just added the patch titled
drm/panfrost: Ensure GPU quirks are always initialised
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-panfrost-ensure-gpu-quirks-are-always-initialise.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dc249be19538e697f6f4ee9d31626f8a036fad7e
Author: Steven Price <steven.price@xxxxxxx>
Date: Wed Sep 9 13:29:57 2020 +0100
drm/panfrost: Ensure GPU quirks are always initialised
[ Upstream commit 8c3c818c23a5bbce6ff180dd2ee04415241df77c ]
The GPU 'CONFIG' registers used to work around hardware issues are
cleared on reset so need to be programmed every time the GPU is reset.
However panfrost_device_reset() failed to do this.
To avoid this in future instead move the call to
panfrost_gpu_init_quirks() to panfrost_gpu_power_on() so that the
regsiters are always programmed just before the cores are powered.
Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver")
Signed-off-by: Steven Price <steven.price@xxxxxxx>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200909122957.51667-1-steven.price@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index f2c1ddc41a9bf..689b92893e0e1 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -304,6 +304,8 @@ void panfrost_gpu_power_on(struct panfrost_device *pfdev)
int ret;
u32 val;
+ panfrost_gpu_init_quirks(pfdev);
+
/* Just turn on everything for now */
gpu_write(pfdev, L2_PWRON_LO, pfdev->features.l2_present);
ret = readl_relaxed_poll_timeout(pfdev->iomem + L2_READY_LO,
@@ -355,7 +357,6 @@ int panfrost_gpu_init(struct panfrost_device *pfdev)
return err;
}
- panfrost_gpu_init_quirks(pfdev);
panfrost_gpu_power_on(pfdev);
return 0;
