linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Lyude Paul <lyude@redhat.com>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	Thomas Graichen <thomas.graichen@gmail.com>
Cc: dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/4] drm/tegra: Create DRM device early
Date: Wed,  1 Dec 2021 02:09:55 +0300	[thread overview]
Message-ID: <20211130230957.30213-3-digetx@gmail.com> (raw)
In-Reply-To: <20211130230957.30213-1-digetx@gmail.com>

DRM sub-drivers need to access DRM device early during first stage of
drivers' probing. Use new host1x init/deinit callbacks to create DRM
device early and destroy late.

Cc: <stable@vger.kernel.org> # 5.13+
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/gpu/drm/tegra/drm.c | 46 ++++++++++++++++++++++++++-----------
 drivers/gpu/drm/tegra/drm.h |  2 ++
 2 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index e9de91a4e7e8..e9cbcaf6e017 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1133,21 +1133,42 @@ static bool host1x_drm_wants_iommu(struct host1x_device *dev)
 	return domain != NULL;
 }
 
-static int host1x_drm_probe(struct host1x_device *dev)
+static struct drm_device *terga_drm_dev;
+
+struct drm_device *tegra_drm_device(void)
 {
-	struct tegra_drm *tegra;
-	struct drm_device *drm;
-	int err;
+	return terga_drm_dev;
+}
 
-	drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev);
+static int host1x_drm_dev_init(struct host1x_device *dev)
+{
+	struct drm_device *drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev);
 	if (IS_ERR(drm))
 		return PTR_ERR(drm);
 
+	dev_set_drvdata(&dev->dev, drm);
+	terga_drm_dev = drm;
+
+	return 0;
+}
+
+static void host1x_drm_dev_deinit(struct host1x_device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(&dev->dev);
+
+	terga_drm_dev = NULL;
+	drm_dev_put(drm);
+}
+
+static int host1x_drm_probe(struct host1x_device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(&dev->dev);
+	struct tegra_drm *tegra;
+	int err;
+
 	tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
-	if (!tegra) {
-		err = -ENOMEM;
-		goto put;
-	}
+	if (!tegra)
+		return -ENOMEM;
 
 	if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
 		tegra->domain = iommu_domain_alloc(&platform_bus_type);
@@ -1164,7 +1185,6 @@ static int host1x_drm_probe(struct host1x_device *dev)
 	mutex_init(&tegra->clients_lock);
 	INIT_LIST_HEAD(&tegra->clients);
 
-	dev_set_drvdata(&dev->dev, drm);
 	drm->dev_private = tegra;
 	tegra->drm = drm;
 
@@ -1285,8 +1305,7 @@ static int host1x_drm_probe(struct host1x_device *dev)
 		iommu_domain_free(tegra->domain);
 free:
 	kfree(tegra);
-put:
-	drm_dev_put(drm);
+
 	return err;
 }
 
@@ -1319,7 +1338,6 @@ static int host1x_drm_remove(struct host1x_device *dev)
 	}
 
 	kfree(tegra);
-	drm_dev_put(drm);
 
 	return 0;
 }
@@ -1391,6 +1409,8 @@ static struct host1x_driver host1x_drm_driver = {
 	.probe = host1x_drm_probe,
 	.remove = host1x_drm_remove,
 	.subdevs = host1x_drm_subdevs,
+	.init = host1x_drm_dev_init,
+	.deinit = host1x_drm_dev_deinit,
 };
 
 static struct platform_driver * const drivers[] = {
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index fc0a19554eac..8b7c9508070f 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -121,6 +121,8 @@ int tegra_drm_unregister_client(struct tegra_drm *tegra,
 int host1x_client_iommu_attach(struct host1x_client *client);
 void host1x_client_iommu_detach(struct host1x_client *client);
 
+struct drm_device *tegra_drm_device(void);
+
 int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm);
 int tegra_drm_exit(struct tegra_drm *tegra);
 
-- 
2.33.1


  parent reply	other threads:[~2021-11-30 23:10 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-30 23:09 [PATCH v2 0/4] Restore Tegra DRM on Nyan Big Chromebook Dmitry Osipenko
2021-11-30 23:09 ` [PATCH v2 1/4] gpu/host1x: Add init/deinit callbacks to host1x driver framework Dmitry Osipenko
2021-11-30 23:09 ` Dmitry Osipenko [this message]
2021-11-30 23:09 ` [PATCH v2 3/4] drm/tegra: dpaux: Restore DP AUX DDC registration order Dmitry Osipenko
2021-11-30 23:09 ` [PATCH v2 4/4] drm/tegra: Use dev_err_probe() Dmitry Osipenko

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20211130230957.30213-3-digetx@gmail.com \
    --to=digetx@gmail.com \
    --cc=airlied@linux.ie \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=jonathanh@nvidia.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-tegra@vger.kernel.org \
    --cc=lyude@redhat.com \
    --cc=thierry.reding@gmail.com \
    --cc=thomas.graichen@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).