linux-kernel - Re: [PATCH] drm/vkms: Remove usage of legacy drm

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Message-ID: <Zv8IPRKcPqYXgL2B@intel.com>
Date: Fri, 4 Oct 2024 00:10:21 +0300
From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
To: Louis Chauvet <louis.chauvet@...tlin.com>
Cc: Maíra Canal <mairacanal@...eup.net>,
	Haneen Mohammed <hamohammed.sa@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Melissa Wen <melissa.srw@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, thomas.petazzoni@...tlin.com,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vkms: Remove usage of legacy drm_crtc members

On Thu, Oct 03, 2024 at 05:41:10PM +0200, Louis Chauvet wrote:
> Some members of the drm_crtc structure have been deprecated in favor of
> equivalent members in the drm_crtc_state structure. As reported by Ville
> Syrjala [1], the VKMS driver was still using these deprecated fields. This
> commit updates the VKMS driver to use the new drm_crtc_state fields
> instead.
> 
> Additionally, this commit removes the call to
> `drm_calc_timestamping_constants` in `vkms_enable_vblank` as it is
> redundant. This calculation is already performed in
> `vkms_atomic_commit_tail` by calling
> `drm_atomic_helper_commit_modeset_disables`.

One slight difference here is that
drm_atomic_helper_calc_timestamping_constants() passes in
crtc_state->adjusted_mode instead of crtc_state->mode, but
doesn't look look vkms mangles either in any way so they should
stay identical after drm_atomic_helper_check_modeset()->mode_fixup()
has done the copy.

Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>

> 
> [1]:https://lore.kernel.org/all/20241002182200.15363-1-ville.syrjala@linux.intel.com/
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
>  drivers/gpu/drm/vkms/vkms_composer.c  | 4 ++--
>  drivers/gpu/drm/vkms/vkms_crtc.c      | 2 --
>  drivers/gpu/drm/vkms/vkms_writeback.c | 4 ++--
>  3 files changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> index 57a5769fc994..3f0977d746be 100644
> --- a/drivers/gpu/drm/vkms/vkms_composer.c
> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> @@ -187,7 +187,7 @@ static void blend(struct vkms_writeback_job *wb,
>  
>  	const struct pixel_argb_u16 background_color = { .a = 0xffff };
>  
> -	size_t crtc_y_limit = crtc_state->base.crtc->mode.vdisplay;
> +	size_t crtc_y_limit = crtc_state->base.mode.vdisplay;
>  
>  	/*
>  	 * The planes are composed line-by-line to avoid heavy memory usage. It is a necessary
> @@ -270,7 +270,7 @@ static int compose_active_planes(struct vkms_writeback_job *active_wb,
>  	if (WARN_ON(check_format_funcs(crtc_state, active_wb)))
>  		return -EINVAL;
>  
> -	line_width = crtc_state->base.crtc->mode.hdisplay;
> +	line_width = crtc_state->base.mode.hdisplay;
>  	stage_buffer.n_pixels = line_width;
>  	output_buffer.n_pixels = line_width;
>  
> diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> index a40295c18b48..bbf080d32d2c 100644
> --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> @@ -64,8 +64,6 @@ static int vkms_enable_vblank(struct drm_crtc *crtc)
>  	struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc);
>  	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
>  
> -	drm_calc_timestamping_constants(crtc, &crtc->mode);
> -
>  	hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
>  	out->vblank_hrtimer.function = &vkms_vblank_simulate;
>  	out->period_ns = ktime_set(0, vblank->framedur_ns);
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
> index bc724cbd5e3a..999d5c01ea81 100644
> --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -131,8 +131,8 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
>  	struct drm_connector_state *conn_state = wb_conn->base.state;
>  	struct vkms_crtc_state *crtc_state = output->composer_state;
>  	struct drm_framebuffer *fb = connector_state->writeback_job->fb;
> -	u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
> -	u16 crtc_width = crtc_state->base.crtc->mode.hdisplay;
> +	u16 crtc_height = crtc_state->base.mode.vdisplay;
> +	u16 crtc_width = crtc_state->base.mode.hdisplay;
>  	struct vkms_writeback_job *active_wb;
>  	struct vkms_frame_info *wb_frame_info;
>  	u32 wb_format = fb->format->format;
> 
> ---
> base-commit: cbc1e8696fbea0010a73bf93534c712f9ad177db
> change-id: 20241003-remove-legacy-a2683a7bbcd5
> 
> Best regards,
> -- 
> Louis Chauvet <louis.chauvet@...tlin.com>

-- 
Ville Syrjälä
Intel