[PATCH v3 08/14] drm/mgag200: Set SCROFF in primary-plane code

[Thomas Zimmermann]

The SCROFF bit controls reading the primary plane's scanout buffer
from video memory. Set it from primary-plane code, instead of CRTC
code.

v3:
        * only flip SCROFF when enabling/disabling the plane (Jocelyn)

Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
Reviewed-by: Jocelyn Falempe <jfale...@redhat.com>
Tested-by: Jocelyn Falempe <jfale...@redhat.com>
Acked-by: Sam Ravnborg <s...@ravnborg.org>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 35 +++++++++++++++-----------
 1 file changed, 20 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c 
b/drivers/gpu/drm/mgag200/mgag200_mode.c
index b524c1c5f032..22f15d4b4ff0 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -549,7 +549,7 @@ static void mgag200_g200ev_set_hiprilvl(struct mga_device 
*mdev)
 
 static void mgag200_enable_display(struct mga_device *mdev)
 {
-       u8 seq0, seq1, crtcext1;
+       u8 seq0, crtcext1;
 
        RREG_SEQ(0x00, seq0);
        seq0 |= MGAREG_SEQ0_SYNCRST |
@@ -563,12 +563,6 @@ static void mgag200_enable_display(struct mga_device *mdev)
        mga_wait_vsync(mdev);
        mga_wait_busy(mdev);
 
-       RREG_SEQ(0x01, seq1);
-       seq1 &= ~MGAREG_SEQ1_SCROFF;
-       WREG_SEQ(0x01, seq1);
-
-       msleep(20);
-
        RREG_ECRT(0x01, crtcext1);
        crtcext1 &= ~MGAREG_CRTCEXT1_VSYNCOFF;
        crtcext1 &= ~MGAREG_CRTCEXT1_HSYNCOFF;
@@ -577,7 +571,7 @@ static void mgag200_enable_display(struct mga_device *mdev)
 
 static void mgag200_disable_display(struct mga_device *mdev)
 {
-       u8 seq0, seq1, crtcext1;
+       u8 seq0, crtcext1;
 
        RREG_SEQ(0x00, seq0);
        seq0 &= ~MGAREG_SEQ0_SYNCRST;
@@ -590,12 +584,6 @@ static void mgag200_disable_display(struct mga_device 
*mdev)
        mga_wait_vsync(mdev);
        mga_wait_busy(mdev);
 
-       RREG_SEQ(0x01, seq1);
-       seq1 |= MGAREG_SEQ1_SCROFF;
-       WREG_SEQ(0x01, seq1);
-
-       msleep(20);
-
        RREG_ECRT(0x01, crtcext1);
        crtcext1 |= MGAREG_CRTCEXT1_VSYNCOFF |
                    MGAREG_CRTCEXT1_HSYNCOFF;
@@ -673,6 +661,7 @@ static void 
mgag200_primary_plane_helper_atomic_update(struct drm_plane *plane,
        struct drm_framebuffer *fb = plane_state->fb;
        struct drm_atomic_helper_damage_iter iter;
        struct drm_rect damage;
+       u8 seq1;
 
        if (!fb)
                return;
@@ -685,11 +674,27 @@ static void 
mgag200_primary_plane_helper_atomic_update(struct drm_plane *plane,
        /* Always scanout image at VRAM offset 0 */
        mgag200_set_startadd(mdev, (u32)0);
        mgag200_set_offset(mdev, fb);
+
+       if (!old_plane_state->crtc && plane_state->crtc) { // enabling
+               RREG_SEQ(0x01, seq1);
+               seq1 &= ~MGAREG_SEQ1_SCROFF;
+               WREG_SEQ(0x01, seq1);
+               msleep(20);
+       }
 }
 
 static void mgag200_primary_plane_helper_atomic_disable(struct drm_plane 
*plane,
                                                        struct drm_atomic_state 
*old_state)
-{ }
+{
+       struct drm_device *dev = plane->dev;
+       struct mga_device *mdev = to_mga_device(dev);
+       u8 seq1;
+
+       RREG_SEQ(0x01, seq1);
+       seq1 |= MGAREG_SEQ1_SCROFF;
+       WREG_SEQ(0x01, seq1);
+       msleep(20);
+}
 
 static const struct drm_plane_helper_funcs mgag200_primary_plane_helper_funcs 
= {
        DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
-- 
2.37.1