linux-kernel - Re: [PATCH v2] drm/panthor: Enable timestamp propagation

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Message-ID: <20251205172831.2a176165@fedora>
Date: Fri, 5 Dec 2025 17:28:31 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Steven Price <steven.price@....com>
Cc: Ashley Smith <ashley.smith@...labora.com>, Liviu Dudau
 <liviu.dudau@....com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, kernel@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/panthor: Enable timestamp propagation

On Mon, 1 Dec 2025 16:35:23 +0000
Steven Price <steven.price@....com> wrote:

> On 27/11/2025 11:44, Ashley Smith wrote:
> > Set the GLB_COUNTER_EN bit to enable coherent propagation of GPU
> > timestamp values to shader cores. This is a prerequisite for exposing
> > device-coherent timestamp queries.
> > 
> > Bump the version to 1.6 so userspace can detect support.
> > 
> > v2:
> > - GLB_COUNTER_EN is not a toggle bit move to panthor_fw_update_reqs
> > 
> > Signed-off-by: Ashley Smith <ashley.smith@...labora.com>  
> 
> Reviewed-by: Steven Price <steven.price@....com>

Queued to drm-misc-next.

> 
> > ---
> >  drivers/gpu/drm/panthor/panthor_drv.c | 3 ++-
> >  drivers/gpu/drm/panthor/panthor_fw.c  | 4 +++-
> >  2 files changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> > index d1d4c50da5bf..0b0ec3b978c6 100644
> > --- a/drivers/gpu/drm/panthor/panthor_drv.c
> > +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> > @@ -1604,6 +1604,7 @@ static void panthor_debugfs_init(struct drm_minor *minor)
> >   * - 1.3 - adds DRM_PANTHOR_GROUP_STATE_INNOCENT flag
> >   * - 1.4 - adds DRM_IOCTL_PANTHOR_BO_SET_LABEL ioctl
> >   * - 1.5 - adds DRM_PANTHOR_SET_USER_MMIO_OFFSET ioctl
> > + * - 1.6 - enables GLB_COUNTER_EN
> >   */
> >  static const struct drm_driver panthor_drm_driver = {
> >  	.driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ |
> > @@ -1617,7 +1618,7 @@ static const struct drm_driver panthor_drm_driver = {
> >  	.name = "panthor",
> >  	.desc = "Panthor DRM driver",
> >  	.major = 1,
> > -	.minor = 5,
> > +	.minor = 6,
> >  
> >  	.gem_create_object = panthor_gem_create_object,
> >  	.gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,
> > diff --git a/drivers/gpu/drm/panthor/panthor_fw.c b/drivers/gpu/drm/panthor/panthor_fw.c
> > index 38d87ab92eda..a55731e95884 100644
> > --- a/drivers/gpu/drm/panthor/panthor_fw.c
> > +++ b/drivers/gpu/drm/panthor/panthor_fw.c
> > @@ -996,7 +996,9 @@ static void panthor_fw_init_global_iface(struct panthor_device *ptdev)
> >  					 GLB_IDLE_EN |
> >  					 GLB_IDLE;
> >  
> > -	panthor_fw_update_reqs(glb_iface, req, GLB_IDLE_EN, GLB_IDLE_EN);
> > +	panthor_fw_update_reqs(glb_iface, req,
> > +			       GLB_IDLE_EN | GLB_COUNTER_EN,
> > +			       GLB_IDLE_EN | GLB_COUNTER_EN);
> >  	panthor_fw_toggle_reqs(glb_iface, req, ack,
> >  			       GLB_CFG_ALLOC_EN |
> >  			       GLB_CFG_POWEROFF_TIMER |
> > 
> > base-commit: 92c49b3f4df8f9acfa95551ef38fc00c675319fd  
>