[PATCH v5 2/8] drm/i915/display/i9xx: Add a disable_tiling() for i9xx planes

[Jocelyn Falempe]

drm_panic draws in linear framebuffer, so it's easier to re-use the
current framebuffer, and disable tiling in the panic handler, to show
the panic screen.

Signed-off-by: Jocelyn Falempe <jfale...@redhat.com>
---
 drivers/gpu/drm/i915/display/i9xx_plane.c     | 23 +++++++++++++++++++
 .../drm/i915/display/intel_display_types.h    |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/i9xx_plane.c 
b/drivers/gpu/drm/i915/display/i9xx_plane.c
index aef8d8b7ea85f..d5538adbb3624 100644
--- a/drivers/gpu/drm/i915/display/i9xx_plane.c
+++ b/drivers/gpu/drm/i915/display/i9xx_plane.c
@@ -866,6 +866,27 @@ static const struct drm_plane_funcs i8xx_plane_funcs = {
        .format_mod_supported = i8xx_plane_format_mod_supported,
 };
 
+static void i9xx_disable_tiling(struct intel_plane *plane)
+{
+       struct intel_display *display = to_intel_display(plane);
+       enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
+       u32 dspcntr;
+       u32 reg;
+
+       dspcntr = intel_de_read_fw(display, DSPCNTR(display, i9xx_plane));
+       dspcntr &= ~DISP_TILED;
+       intel_de_write_fw(display, DSPCNTR(display, i9xx_plane), dspcntr);
+
+       if (DISPLAY_VER(display) >= 4) {
+               reg = intel_de_read_fw(display, DSPSURF(display, i9xx_plane));
+               intel_de_write_fw(display, DSPSURF(display, i9xx_plane), reg);
+
+       } else {
+               reg = intel_de_read_fw(display, DSPADDR(display, i9xx_plane));
+               intel_de_write_fw(display, DSPADDR(display, i9xx_plane), reg);
+       }
+}
+
 struct intel_plane *
 intel_primary_plane_create(struct intel_display *display, enum pipe pipe)
 {
@@ -1001,6 +1022,8 @@ intel_primary_plane_create(struct intel_display *display, 
enum pipe pipe)
                }
        }
 
+       plane->disable_tiling = i9xx_disable_tiling;
+
        modifiers = intel_fb_plane_get_modifiers(display, 
INTEL_PLANE_CAP_TILING_X);
 
        if (DISPLAY_VER(display) >= 5 || display->platform.g4x)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h 
b/drivers/gpu/drm/i915/display/intel_display_types.h
index 6a82c6ade549b..38e2108b01ff6 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1507,6 +1507,8 @@ struct intel_plane {
                           bool async_flip);
        void (*enable_flip_done)(struct intel_plane *plane);
        void (*disable_flip_done)(struct intel_plane *plane);
+       /* For drm_panic */
+       void (*disable_tiling)(struct intel_plane *plane);
 };
 
 #define to_intel_atomic_state(x) container_of(x, struct intel_atomic_state, 
base)
-- 
2.47.1