Display and scaling engine interrupts need to be disabled when the runtime pm invokes malidp_runtime_pm_suspend(). Conversely, they need to be enabled in malidp_runtime_pm_resume().
This patch depends on: https://lkml.org/lkml/2017/5/15/695
Signed-off-by: Ayan Kumar Halder ayan.halder@arm.com Signed-off-by: Alexandru-Cosmin Gheorghe Alexandru-Cosmin.Gheorghe@arm.com Reported-by: Alexandru-Cosmin Gheorghe Alexandru-Cosmin.Gheorghe@arm.com
--- Changes in v3:- - Abandoned https://patchwork.kernel.org/patch/10357213/ bacause scaling (aka writeback) interrupts are enabled or disabled when a commit posts a scene with or without writeback framebuffer respectively. This causes an issue in the following sequence:- (It is to be noted that scaling engine interrupts are used for writeback) 1. Commit with writeback attached. 2. Before writeback finishes, commit without writeback, which calls disable_writeback -> disable scaling interrupts (ie clears the scaling interrupt mask). 3. Scaling (ie for writeback completion) interrupt is called for commit in step 1. However, as the scaling interrupt mask has been cleared by step 2, so writeback completion is not signalled to userspace app. This is a BUG.
Changes in v2:- - Removed the change id --- drivers/gpu/drm/arm/malidp_drv.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c index f7a8beb..983b854 100644 --- a/drivers/gpu/drm/arm/malidp_drv.c +++ b/drivers/gpu/drm/arm/malidp_drv.c @@ -470,6 +470,8 @@ static int malidp_runtime_pm_suspend(struct device *dev) /* we can only suspend if the hardware is in config mode */ WARN_ON(!hwdev->hw->in_config_mode(hwdev));
+ malidp_se_irq_fini(hwdev); + malidp_de_irq_fini(hwdev); hwdev->pm_suspended = true; clk_disable_unprepare(hwdev->mclk); clk_disable_unprepare(hwdev->aclk); @@ -488,6 +490,8 @@ static int malidp_runtime_pm_resume(struct device *dev) clk_prepare_enable(hwdev->aclk); clk_prepare_enable(hwdev->mclk); hwdev->pm_suspended = false; + malidp_de_irq_hw_init(hwdev); + malidp_se_irq_hw_init(hwdev);
return 0; }