drm/arm/malidp: Enable/disable interrupts in runtime pm

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/2017/5/15/695Reported-by: NAlexandru-Cosmin Gheorghe <Alexandru-Cosmin.Gheorghe@arm.com>
Signed-off-by: NAlexandru-Cosmin Gheorghe <Alexandru-Cosmin.Gheorghe@arm.com>
Signed-off-by: NAyan Kumar Halder <ayan.halder@arm.com>
Acked-by: NLiviu Dudau <liviu.dudau@arm.com>
Signed-off-by: NLiviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/malidp_drv.c

@@ -582,6 +582,8 @@ 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);
@@ -600,6 +602,8 @@ 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;
 }