With this bit enabled, HW changes the color when compressing frames for
debug purposes.
ALthough the simple way to enable a single bit is over intel_reg_write,
this value is overwriten on next update_fbc so depending on the workload
it is not possible to set this bit with intel-gpu-tools. So this patch
introduces a persistent way to enable false color over debugfs.
v2: Use DEFINE_SIMPLE_ATTRIBUTE as Daniel suggested
v3: (Ville) only do false color for IVB+ since according to spec bit is
MBZ before IVB.
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Ben Widawsky <b...@bwidawsk.net>
Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 42 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 3 +++
4 files changed, 48 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 9e737b7..bcfdc00 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1433,6 +1433,47 @@ static int i915_fbc_status(struct seq_file *m, void
*unused)
return 0;
}
+static int i915_fbc_fc_get(void *data, u64 *val)
+{
+ struct drm_device *dev = data;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (INTEL_INFO(dev)->gen < 7)
+ return -ENODEV;
+
+ drm_modeset_lock_all(dev);
+ *val = dev_priv->fbc.false_color;
+ drm_modeset_unlock_all(dev);
+
+ return 0;
+}
+
+static int i915_fbc_fc_set(void *data, u64 val)
+{
+ struct drm_device *dev = data;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 reg;
+
+ if (INTEL_INFO(dev)->gen < 7)
+ return -ENODEV;
+
+ drm_modeset_lock_all(dev);
+
+ reg = I915_READ(ILK_DPFC_CONTROL);
+ dev_priv->fbc.false_color = val;
+
+ I915_WRITE(ILK_DPFC_CONTROL, val ?
+ (reg | FBC_CTL_FALSE_COLOR) :
+ (reg & ~FBC_CTL_FALSE_COLOR));
+
+ drm_modeset_unlock_all(dev);
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(i915_fbc_fc_fops,
+ i915_fbc_fc_get, i915_fbc_fc_set,
+ "%llu\n");
+
static int i915_ips_status(struct seq_file *m, void *unused)
{
struct drm_info_node *node = m->private;
@@ -3957,6 +3998,7 @@ static const struct i915_debugfs_files {
{"i915_pri_wm_latency", &i915_pri_wm_latency_fops},
{"i915_spr_wm_latency", &i915_spr_wm_latency_fops},
{"i915_cur_wm_latency", &i915_cur_wm_latency_fops},
+ {"i915_fbc_false_color", &i915_fbc_fc_fops},
};
void intel_display_crc_init(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 18c9ad8..3018bf5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -636,6 +636,8 @@ struct i915_fbc {
struct drm_mm_node compressed_fb;
struct drm_mm_node *compressed_llb;
+ bool false_color;
+
struct intel_fbc_work {
struct delayed_work work;
struct drm_crtc *crtc;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 28e21ed..b5d295a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1540,6 +1540,7 @@ enum punit_power_well {
/* Framebuffer compression for Ironlake */
#define ILK_DPFC_CB_BASE 0x43200
#define ILK_DPFC_CONTROL 0x43208
+#define FBC_CTL_FALSE_COLOR (1<<10)
/* The bit 28-8 is reserved */
#define DPFC_RESERVED (0x1FFFFF00)
#define ILK_DPFC_RECOMP_CTL 0x4320c
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1ddd4df..338a80b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -309,6 +309,9 @@ static void gen7_enable_fbc(struct drm_crtc *crtc)
dpfc_ctl |= IVB_DPFC_CTL_FENCE_EN;
+ if (dev_priv->fbc.false_color)
+ dpfc_ctl |= FBC_CTL_FALSE_COLOR;
+
I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
if (IS_IVYBRIDGE(dev)) {
--
1.9.3
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