From 608f43ad27ab26700677cc4d9ead3b2d9d338a21 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Mon, 2 Dec 2019 10:51:58 +0100 Subject: gpu: host1x: Rename "parent" to "host" Rename the host1x clients' parent to "host" because that more closely describes what it is. The parent can be confused with the parent device in terms of the device hierarchy. Subsequent patches will add a new member that refers to the parent in that hierarchy. Signed-off-by: Thierry Reding --- drivers/gpu/host1x/bus.c | 4 ++-- drivers/gpu/host1x/syncpt.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/gpu/host1x') diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c index 2c8559ff3481..50d500345d04 100644 --- a/drivers/gpu/host1x/bus.c +++ b/drivers/gpu/host1x/bus.c @@ -120,7 +120,7 @@ static void host1x_subdev_register(struct host1x_device *device, mutex_lock(&device->clients_lock); list_move_tail(&client->list, &device->clients); list_move_tail(&subdev->list, &device->active); - client->parent = &device->dev; + client->host = &device->dev; subdev->client = client; mutex_unlock(&device->clients_lock); mutex_unlock(&device->subdevs_lock); @@ -156,7 +156,7 @@ static void __host1x_subdev_unregister(struct host1x_device *device, */ mutex_lock(&device->clients_lock); subdev->client = NULL; - client->parent = NULL; + client->host = NULL; list_move_tail(&subdev->list, &device->subdevs); /* * XXX: Perhaps don't do this here, but rather explicitly remove it diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c index dd1cd0142941..fce7892d5137 100644 --- a/drivers/gpu/host1x/syncpt.c +++ b/drivers/gpu/host1x/syncpt.c @@ -421,7 +421,7 @@ int host1x_syncpt_init(struct host1x *host) struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client, unsigned long flags) { - struct host1x *host = dev_get_drvdata(client->parent->parent); + struct host1x *host = dev_get_drvdata(client->host->parent); return host1x_syncpt_alloc(host, client, flags); } -- cgit From fd67e9c6ed5af223af0daee093593abe3dbb53d4 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Mon, 2 Dec 2019 15:29:03 +0100 Subject: drm/tegra: Do not implement runtime PM The Tegra DRM driver heavily relies on the implementations for runtime suspend/resume to be called at specific times. Unfortunately, there are some cases where that doesn't work. One example is if the user disables runtime PM for a given subdevice. Another example is that the PM core acquires a reference to runtime PM during system sleep, effectively preventing devices from going into low power modes. This is intentional to avoid nasty race conditions, but it also causes system sleep to not function properly on all Tegra systems. Fix this by not implementing runtime PM at all. Instead, a minimal, reference-counted suspend/resume infrastructure is added to the host1x bus. This has the benefit that it can be used regardless of the system power state (or any transitions we might be in), or whether or not the user allows runtime PM. Atomic modesetting guarantees that these functions will end up being called at the right point in time, so the pitfalls for the more generic runtime PM do not apply here. Signed-off-by: Thierry Reding --- drivers/gpu/host1x/bus.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) (limited to 'drivers/gpu/host1x') diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c index 50d500345d04..6a995db51d6d 100644 --- a/drivers/gpu/host1x/bus.c +++ b/drivers/gpu/host1x/bus.c @@ -710,6 +710,10 @@ int host1x_client_register(struct host1x_client *client) struct host1x *host1x; int err; + INIT_LIST_HEAD(&client->list); + mutex_init(&client->lock); + client->usecount = 0; + mutex_lock(&devices_lock); list_for_each_entry(host1x, &devices, list) { @@ -768,3 +772,74 @@ int host1x_client_unregister(struct host1x_client *client) return 0; } EXPORT_SYMBOL(host1x_client_unregister); + +int host1x_client_suspend(struct host1x_client *client) +{ + int err = 0; + + mutex_lock(&client->lock); + + if (client->usecount == 1) { + if (client->ops && client->ops->suspend) { + err = client->ops->suspend(client); + if (err < 0) + goto unlock; + } + } + + client->usecount--; + dev_dbg(client->dev, "use count: %u\n", client->usecount); + + if (client->parent) { + err = host1x_client_suspend(client->parent); + if (err < 0) + goto resume; + } + + goto unlock; + +resume: + if (client->usecount == 0) + if (client->ops && client->ops->resume) + client->ops->resume(client); + + client->usecount++; +unlock: + mutex_unlock(&client->lock); + return err; +} +EXPORT_SYMBOL(host1x_client_suspend); + +int host1x_client_resume(struct host1x_client *client) +{ + int err = 0; + + mutex_lock(&client->lock); + + if (client->parent) { + err = host1x_client_resume(client->parent); + if (err < 0) + goto unlock; + } + + if (client->usecount == 0) { + if (client->ops && client->ops->resume) { + err = client->ops->resume(client); + if (err < 0) + goto suspend; + } + } + + client->usecount++; + dev_dbg(client->dev, "use count: %u\n", client->usecount); + + goto unlock; + +suspend: + if (client->parent) + host1x_client_suspend(client->parent); +unlock: + mutex_unlock(&client->lock); + return err; +} +EXPORT_SYMBOL(host1x_client_resume); -- cgit From 033ccdb7f6b11701623507339646013b4ce389d3 Mon Sep 17 00:00:00 2001 From: YueHaibing Date: Sat, 2 Nov 2019 15:57:44 +0800 Subject: gpu: host1x: Remove dev_err() on platform_get_irq() failure platform_get_irq() will call dev_err() itself on failure, so there is no need for the driver to also do this. This is detected by coccinelle. Signed-off-by: YueHaibing Signed-off-by: Thierry Reding --- drivers/gpu/host1x/dev.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'drivers/gpu/host1x') diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index a738ea55e407..388bcc2889aa 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -339,10 +339,8 @@ static int host1x_probe(struct platform_device *pdev) } syncpt_irq = platform_get_irq(pdev, 0); - if (syncpt_irq < 0) { - dev_err(&pdev->dev, "failed to get IRQ: %d\n", syncpt_irq); + if (syncpt_irq < 0) return syncpt_irq; - } mutex_init(&host->devices_lock); INIT_LIST_HEAD(&host->devices); -- cgit