This is a note to let you know that I've just added the patch titled drm/panfrost: increase readl_relaxed_poll_timeout values to the 5.8-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-increase-readl_relaxed_poll_timeout-val.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 84ff309e322692c6cf33f1dba45fa7d6ea860cec Author: Christian Hewitt <christianshewitt@xxxxxxxxx> Date: Thu Oct 8 14:17:38 2020 +0000 drm/panfrost: increase readl_relaxed_poll_timeout values [ Upstream commit c2df75ad2a9f205820e4bc0db936d3d9af3da1ae ] Amlogic SoC devices report the following errors frequently causing excessive dmesg log spam and early log rotataion, although the errors appear to be harmless as everything works fine: [ 7.202702] panfrost ffe40000.gpu: error powering up gpu L2 [ 7.203760] panfrost ffe40000.gpu: error powering up gpu shader ARM staff have advised increasing the timeout values to eliminate the errors in most normal scenarios, and testing with several different G31/G52 devices shows 20000 to be a reliable value. Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver") Suggested-by: Steven Price <steven.price@xxxxxxx> Signed-off-by: Christian Hewitt <christianshewitt@xxxxxxxxx> Reviewed-by: Steven Price <steven.price@xxxxxxx> Signed-off-by: Steven Price <steven.price@xxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20201008141738.13560-1-christianshewitt@xxxxxxxxx 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 689b92893e0e1..dfe4c9151eaf2 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c @@ -309,13 +309,13 @@ void panfrost_gpu_power_on(struct panfrost_device *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, - val, val == pfdev->features.l2_present, 100, 1000); + val, val == pfdev->features.l2_present, 100, 20000); if (ret) dev_err(pfdev->dev, "error powering up gpu L2"); gpu_write(pfdev, SHADER_PWRON_LO, pfdev->features.shader_present); ret = readl_relaxed_poll_timeout(pfdev->iomem + SHADER_READY_LO, - val, val == pfdev->features.shader_present, 100, 1000); + val, val == pfdev->features.shader_present, 100, 20000); if (ret) dev_err(pfdev->dev, "error powering up gpu shader");