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Subject[PATCH v3 1/2] drm/file: Rehabilitate the firstopen hook for non-legacy drivers
Date
The firstopen DRM driver hook was initially used to perform hardware
initialization, which is now considered legacy. Only a single user of
firstopen remains at this point (savage).

In some specific cases, non-legacy drivers may also need to implement
these hooks. For instance on VC4, we need to allocate a 16 MiB buffer
for the GPU. Because it's not required for fbcon, it's a waste to
allocate it before userspace starts using the DRM device.

Using firstopen and lastclose for this allocation seems like the best
fit, so re-habilitate the hook to allow it to be called for non-legacy
drivers.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/drm_file.c | 3 +--
include/drm/drm_drv.h | 3 ---
2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index b1838a41ad43..c011b5cbfb6b 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -266,8 +266,7 @@ static int drm_setup(struct drm_device * dev)
{
int ret;

- if (dev->driver->firstopen &&
- drm_core_check_feature(dev, DRIVER_LEGACY)) {
+ if (dev->driver->firstopen) {
ret = dev->driver->firstopen(dev);
if (ret != 0)
return ret;
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index ca46a45a9cce..de5637494503 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -234,9 +234,6 @@ struct drm_driver {
* kernel driver does not really own the hardware. Instead ownershipe is
* handled with the help of userspace through an inheritedly racy dance
* to set/unset the VT into raw mode.
- *
- * Legacy drivers initialize the hardware in the @firstopen callback,
- * which isn't even called for modern drivers.
*/
void (*lastclose) (struct drm_device *);

--
2.21.0
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