[Intel-gfx] [PATCH 2/5] drm/i915: Do not read GAMMA_MODE register
Lionel Landwerlin
lionel.g.landwerlin at intel.com
Tue Feb 23 14:39:09 UTC 2016
Implement Daniel Stone's recommendation to not read registers to infer
the hardware's state.
v2: Read GAMMA_MODE register value at init
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
---
drivers/gpu/drm/i915/intel_color.c | 17 +++++++++++++----
drivers/gpu/drm/i915/intel_drv.h | 3 +++
2 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 5e0b997..f6bf9f1 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -121,6 +121,8 @@ static void haswell_load_luts(struct drm_crtc *crtc)
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+ struct intel_crtc_state *intel_crtc_state =
+ to_intel_crtc_state(crtc->state);
bool reenable_ips = false;
/*
@@ -128,11 +130,12 @@ static void haswell_load_luts(struct drm_crtc *crtc)
* GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
*/
if (IS_HASWELL(dev) && intel_crtc->config->ips_enabled &&
- ((I915_READ(GAMMA_MODE(intel_crtc->pipe)) & GAMMA_MODE_MODE_MASK) ==
- GAMMA_MODE_MODE_SPLIT)) {
+ (intel_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)) {
hsw_disable_ips(intel_crtc);
reenable_ips = true;
}
+
+ intel_crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
I915_WRITE(GAMMA_MODE(intel_crtc->pipe), GAMMA_MODE_MODE_8BIT);
i9xx_load_luts(crtc);
@@ -173,6 +176,8 @@ void intel_color_init(struct drm_crtc *crtc)
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+ struct intel_crtc_state *intel_crtc_state =
+ to_intel_crtc_state(crtc->state);
int i;
drm_mode_crtc_set_gamma_size(crtc, 256);
@@ -183,8 +188,12 @@ void intel_color_init(struct drm_crtc *crtc)
}
if (IS_HASWELL(dev) ||
- (INTEL_INFO(dev)->gen >= 8 && !IS_CHERRYVIEW(dev)))
+ (INTEL_INFO(dev)->gen >= 8 && !IS_CHERRYVIEW(dev))) {
dev_priv->display.load_luts = haswell_load_luts;
- else
+
+ intel_crtc_state->gamma_mode =
+ I915_READ(GAMMA_MODE(intel_crtc->pipe));
+ } else {
dev_priv->display.load_luts = i9xx_load_luts;
+ }
}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 40fc486..9742d5b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -517,6 +517,9 @@ struct intel_crtc_state {
struct skl_pipe_wm skl;
} optimal;
} wm;
+
+ /* Gamma mode programmed on the pipe */
+ uint32_t gamma_mode;
};
struct vlv_wm_state {
--
2.7.0
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