[PATCH v3] drm/panthor: Add DEV_QUERY_TIMESTAMP_INFO dev query

[Heiko Stübner]

Am Montag, 19. August 2024, 13:25:08 CEST schrieb Mary Guillemard:
> Expose timestamp information supported by the GPU with a new device
> query.
> 
> Mali uses an external timer as GPU system time. On ARM, this is wired to
> the generic arch timer so we wire cntfrq_el0 as device frequency.
> 
> This new uAPI will be used in Mesa to implement timestamp queries and
> VK_KHR_calibrated_timestamps.
> 
> Since this extends the uAPI and because userland needs a way to advertise
> those features conditionally, this also bumps the driver minor version.
> 
> v2:
> - Rewrote to use GPU timestamp register
> - Added timestamp_offset to drm_panthor_timestamp_info
> - Add missing include for arch_timer_get_cntfrq
> - Rework commit message
> 
> v3:
> - Add panthor_gpu_read_64bit_counter
> - Change panthor_gpu_read_timestamp to use
>   panthor_gpu_read_64bit_counter
> 
> Signed-off-by: Mary Guillemard <mary.guillemard at collabora.com>

On a rk3588-tiger with matching MESA build and 
"RUSTICL_ENABLE=panfrost clpeak"

Tested-by: Heiko Stuebner <heiko at sntech.de>