drm/vkms: Remove usage of legacy drm_crtc members

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`.

[1]:https://lore.kernel.org/all/20241002182200.15363-1-ville.syrjala@linux.intel.com/

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241003-remove-legacy-v1-1-0b7db1f1a1a6@bootlin.com
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>

Author: Fomys

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;
 

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);

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;