linux-kernel - Re: [PATCH v3] drm/panthor: Add DEV_QUERY_TIMESTAMP

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Message-ID: <20240828133042.4b731826@collabora.com>
Date: Wed, 28 Aug 2024 13:30:42 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Mary Guillemard <mary.guillemard@...labora.com>
Cc: linux-kernel@...r.kernel.org, kernel@...labora.com, Christopher Healy
 <healych@...zon.com>, Steven Price <steven.price@....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>,
 Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3] drm/panthor: Add DEV_QUERY_TIMESTAMP_INFO dev query

On Mon, 19 Aug 2024 13:25:08 +0200
Mary Guillemard <mary.guillemard@...labora.com> wrote:

> +/**
> + * struct drm_panthor_timestamp_info - Timestamp information
> + *
> + * Structure grouping all queryable information relating to the GPU timestamp.
> + */
> +struct drm_panthor_timestamp_info {
> +	/** @timestamp_frequency: The frequency of the timestamp timer. */
> +	__u64 timestamp_frequency;
> +
> +	/** @current_timestamp: The current timestamp. */
> +	__u64 current_timestamp;
> +
> +	/** @timestamp_offset: The offset of the timestamp timer. */
> +	__u64 timestamp_offset;

I'm not sure we should expose the offset to be honest. It looks like
something that's related to suspend/resume which only the kernel needs
to know.

> +};