drm/panthor: Enable timestamp propagation

[PATCH v2] drm/panthor: Enable timestamp propagation

Posted by Ashley Smith 4 days, 9 hours ago

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@collabora.com>
---
 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
-- 
2.43.0

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

Posted by Steven Price 4 hours ago

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@collabora.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>  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