From 635430797d3fccb958e929d3911e39cb9c1ea641 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Mon, 26 Aug 2019 17:33:10 -0500 Subject: [PATCH] drm/panfrost: Rework runtime PM initialization There's a few issues with the runtime PM initialization. The documentation states pm_runtime_set_active() should be called before pm_runtime_enable(). The pm_runtime_put_autosuspend() could suspend the GPU before panfrost_perfcnt_init() is called which touches the h/w. The autosuspend delay keeps things from breaking. There's no need explicitly power off the GPU only to wake back up with pm_runtime_get_sync(). Just delaying pm_runtime_enable to the end of probe is sufficient. Lets move all the runtime PM calls into the probe() function so they are all in one place and are done after all initialization. Cc: Tomeu Vizoso Cc: Steven Price Cc: David Airlie Cc: Daniel Vetter Acked-by: Alyssa Rosenzweig Signed-off-by: Rob Herring Reviewed-by: Robin Murphy Reviewed-by: Steven Price Link: https://patchwork.freedesktop.org/patch/msgid/20190826223317.28509-2-robh@kernel.org --- drivers/gpu/drm/panfrost/panfrost_device.c | 9 --------- drivers/gpu/drm/panfrost/panfrost_drv.c | 10 ++++++---- 2 files changed, 6 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c index 4da71bb56c20..73805210834e 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.c +++ b/drivers/gpu/drm/panfrost/panfrost_device.c @@ -5,7 +5,6 @@ #include #include #include -#include #include #include "panfrost_device.h" @@ -166,14 +165,6 @@ int panfrost_device_init(struct panfrost_device *pfdev) if (err) goto err_out4; - /* runtime PM will wake us up later */ - panfrost_gpu_power_off(pfdev); - - pm_runtime_set_active(pfdev->dev); - pm_runtime_get_sync(pfdev->dev); - pm_runtime_mark_last_busy(pfdev->dev); - pm_runtime_put_autosuspend(pfdev->dev); - err = panfrost_perfcnt_init(pfdev); if (err) goto err_out5; diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index d74442d71048..bc2ddeb55f5d 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -523,10 +523,6 @@ static int panfrost_probe(struct platform_device *pdev) mutex_init(&pfdev->shrinker_lock); INIT_LIST_HEAD(&pfdev->shrinker_list); - pm_runtime_use_autosuspend(pfdev->dev); - pm_runtime_set_autosuspend_delay(pfdev->dev, 50); /* ~3 frames */ - pm_runtime_enable(pfdev->dev); - err = panfrost_device_init(pfdev); if (err) { if (err != -EPROBE_DEFER) @@ -541,6 +537,12 @@ static int panfrost_probe(struct platform_device *pdev) goto err_out1; } + pm_runtime_set_active(pfdev->dev); + pm_runtime_mark_last_busy(pfdev->dev); + pm_runtime_enable(pfdev->dev); + pm_runtime_set_autosuspend_delay(pfdev->dev, 50); /* ~3 frames */ + pm_runtime_use_autosuspend(pfdev->dev); + /* * Register the DRM device with the core and the connectors with * sysfs -- 2.20.1