From 1165883210103f9ff0f475224a52ba5c57440e4c Mon Sep 17 00:00:00 2001
From: Jocelyn Falempe <jfalempe@redhat.com>
Date: Wed, 4 May 2022 15:40:25 +0200
Subject: drm/mgag200: Optimize damage clips
Git-commit: c48a363016349352dac7e66cd1e823f73bff1fc4
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

When there are multiple damage clips, previous code merged them into one
big rectangle. As the Matrox memory is very slow, it's faster to copy each
damage clip.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220504134026.283417-2-jfalempe@redhat.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index a77da57f1022..294a53b95c61 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -855,10 +855,6 @@ mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb,
 
 	dst += drm_fb_clip_offset(fb->pitches[0], fb->format, clip);
 	drm_fb_memcpy_toio(dst, fb->pitches[0], vmap, fb, clip);
-
-	/* Always scanout image at VRAM offset 0 */
-	mgag200_set_startadd(mdev, (u32)0);
-	mgag200_set_offset(mdev, fb);
 }
 
 static void
@@ -913,6 +909,10 @@ mgag200_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	mgag200_handle_damage(mdev, fb, &fullscreen, &shadow_plane_state->data[0]);
 
+	/* Always scanout image at VRAM offset 0 */
+	mgag200_set_startadd(mdev, (u32)0);
+	mgag200_set_offset(mdev, fb);
+
 	mutex_unlock(&mdev->rmmio_lock);
 }
 
@@ -969,14 +969,20 @@ mgag200_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
 	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
 	struct drm_framebuffer *fb = state->fb;
 	struct drm_rect damage;
+	struct drm_atomic_helper_damage_iter iter;
 
 	if (!fb)
 		return;
 
 	mutex_lock(&mdev->rmmio_lock);
 
-	if (drm_atomic_helper_damage_merged(old_state, state, &damage))
+	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
 		mgag200_handle_damage(mdev, fb, &damage, &shadow_plane_state->data[0]);
+	}
+	/* Always scanout image at VRAM offset 0 */
+	mgag200_set_startadd(mdev, (u32)0);
+	mgag200_set_offset(mdev, fb);
 
 	mutex_unlock(&mdev->rmmio_lock);
 }
-- 
2.38.1