When changing VTs non-atomically the kernel works in conjunction with
the Xserver in user space and receives the LUT information from the
Xserver via a system call. When changing modes atomically for kdb,
this information must be saved and restored without disturbing user
space as if nothing ever happened.
Signed-off-by: Jason Wessel <jason.wes...@windriver.com>
CC: Jesse Barnes <jbar...@virtuousgeek.org>
CC: David Airlie <airl...@linux.ie>
CC: dri-devel@lists.freedesktop.org
---
drivers/gpu/drm/radeon/radeon_display.c | 32 +++++++++++++++++++++++++++
drivers/gpu/drm/radeon/radeon_legacy_crtc.c | 5 ++++
drivers/gpu/drm/radeon/radeon_mode.h | 3 ++
3 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_display.c
b/drivers/gpu/drm/radeon/radeon_display.c
index 127a395..fb47c82 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -138,6 +138,38 @@ void radeon_crtc_load_lut(struct drm_crtc *crtc)
legacy_crtc_load_lut(crtc);
}
+void radeon_crtc_save_lut(struct drm_crtc *crtc)
+{
+ struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
+ int i;
+
+ if (!crtc->enabled)
+ return;
+
+ for (i = 0; i < 256; i++) {
+ radeon_crtc->lut_r_copy[i] = radeon_crtc->lut_r[i];
+ radeon_crtc->lut_g_copy[i] = radeon_crtc->lut_g[i];
+ radeon_crtc->lut_b_copy[i] = radeon_crtc->lut_b[i];
+ }
+}
+
+void radeon_crtc_restore_lut(struct drm_crtc *crtc)
+{
+ struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
+ int i;
+
+ if (!crtc->enabled)
+ return;
+
+ for (i = 0; i < 256; i++) {
+ radeon_crtc->lut_r[i] = radeon_crtc->lut_r_copy[i];
+ radeon_crtc->lut_g[i] = radeon_crtc->lut_g_copy[i];
+ radeon_crtc->lut_b[i] = radeon_crtc->lut_b_copy[i];
+ }
+
+ radeon_crtc_load_lut(crtc);
+}
+
/** Sets the color ramps on behalf of fbcon */
void radeon_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
u16 blue, int regno)
diff --git a/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
b/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
index 8752d34..4295478 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
@@ -355,6 +355,11 @@ int radeon_crtc_set_base_atomic(struct drm_crtc *crtc,
struct drm_framebuffer *fb,
int x, int y, int enter)
{
+ if (enter)
+ radeon_crtc_save_lut(crtc);
+ else
+ radeon_crtc_restore_lut(crtc);
+
return radeon_crtc_do_set_base(crtc, fb, x, y, 1);
}
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h
b/drivers/gpu/drm/radeon/radeon_mode.h
index c4116d3..2f78615 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -267,6 +267,7 @@ struct radeon_crtc {
struct drm_crtc base;
int crtc_id;
u16 lut_r[256], lut_g[256], lut_b[256];
+ u16 lut_r_copy[256], lut_g_copy[256], lut_b_copy[256];
bool enabled;
bool can_tile;
uint32_t crtc_offset;
@@ -512,6 +513,8 @@ extern int atombios_get_encoder_mode(struct drm_encoder
*encoder);
extern void radeon_encoder_set_active_device(struct drm_encoder *encoder);
extern void radeon_crtc_load_lut(struct drm_crtc *crtc);
+extern void radeon_crtc_save_lut(struct drm_crtc *crtc);
+extern void radeon_crtc_restore_lut(struct drm_crtc *crtc);
extern int atombios_crtc_set_base(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *old_fb);
extern int atombios_crtc_set_base_atomic(struct drm_crtc *crtc,
--
1.6.3.3
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