To get a ycbcr420 output from intel platforms, there are two
major steps:
- RGB->YCBCR conversion using a pipe CSC.
- Program PIPE_MISC register to generate a ycbcr420 output.
- Scaling down YCBCR444 samples to YCBCR420 samples using a pipe
scaler.
This patch:
- Does scaler allocation for HDMI ycbcr420 outputs.
- Programs PIPE_MISC register for ycbcr420 output.
- Adds a new scaler user "HDMI output" to plug-into existing
scaler framework. This output is identified with bit 30
of the scaler users bitmap.
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
Cc: Ander Conselvan De Oliveira <ander.conselvan.de.olive...@intel.com>
Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_atomic.c | 6 ++++++
drivers/gpu/drm/i915/intel_display.c | 34 ++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 10 +++++++++-
drivers/gpu/drm/i915/intel_hdmi.c | 11 +++++++++++
drivers/gpu/drm/i915/intel_panel.c | 3 ++-
6 files changed, 65 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 11b12f4..ecf28df 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5024,6 +5024,9 @@ enum {
#define _PIPE_MISC_A 0x70030
#define _PIPE_MISC_B 0x71030
+#define PIPEMISC_YCBCR420_ENABLE (1<<27)
+#define PIPEMISC_YCBCR420_MODE_BLEND (1<<26)
+#define PIPEMISC_OUTPUT_YCBCR (1<<11)
#define PIPEMISC_DITHER_BPC_MASK (7<<5)
#define PIPEMISC_DITHER_8_BPC (0<<5)
#define PIPEMISC_DITHER_10_BPC (1<<5)
diff --git a/drivers/gpu/drm/i915/intel_atomic.c
b/drivers/gpu/drm/i915/intel_atomic.c
index 50fb1f7..592b0d2 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -187,6 +187,12 @@ int intel_atomic_setup_scalers(struct drm_i915_private
*dev_priv,
/* panel fitter case: assign as a crtc scaler */
scaler_id = &scaler_state->scaler_id;
+ } else if (i == SKL_HDMI_OUTPUT_INDEX) {
+ name = "HDMI-OUTPUT";
+ idx = intel_crtc->base.base.id;
+
+ /* hdmi output case: needs a pipe scaler */
+ scaler_id = &scaler_state->scaler_id;
} else {
name = "PLANE";
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index b03e5f3..5c4b342 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4611,6 +4611,11 @@ skl_update_scaler(struct intel_crtc_state *crtc_state,
bool force_detach,
(src_h != dst_w || src_w != dst_h):
(src_w != dst_w || src_h != dst_h);
+ if (crtc_state->hdmi_output == DRM_HDMI_OUTPUT_YCBCR420
+ && scaler_user == SKL_HDMI_OUTPUT_INDEX)
+ /* YCBCR 444 -> 420 conversion needs a scaler */
+ need_scaling = true;
+
/*
* if plane is being disabled or scaler is no more required or force
detach
* - free scaler binded to this plane/crtc
@@ -4658,6 +4663,26 @@ skl_update_scaler(struct intel_crtc_state *crtc_state,
bool force_detach,
}
/**
+ * skl_update_scaler_hdmi_output - Stages update to scaler state for HDMI.
+ * HDMI YCBCR 420 output needs a scaler, for downsampling.
+ *
+ * @state: crtc's scaler state
+ *
+ * Return
+ * 0 - scaler_usage updated successfully
+ * error - requested scaling cannot be supported or other error condition
+ */
+int skl_update_scaler_crtc_hdmi_output(struct intel_crtc_state *state)
+{
+ const struct drm_display_mode *mode = &state->base.adjusted_mode;
+
+ return skl_update_scaler(state, !state->base.active,
+ SKL_HDMI_OUTPUT_INDEX, &state->scaler_state.scaler_id,
+ DRM_ROTATE_0, state->pipe_src_w, state->pipe_src_h,
+ mode->crtc_hdisplay, mode->crtc_vdisplay);
+}
+
+/**
* skl_update_scaler_crtc - Stages update to scaler state for a given crtc.
*
* @state: crtc's scaler state
@@ -8053,6 +8078,7 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
{
struct drm_i915_private *dev_priv = to_i915(crtc->dev);
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+ enum drm_hdmi_output_type hdmi_out = intel_crtc->config->hdmi_output;
if (IS_BROADWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 9) {
u32 val = 0;
@@ -8078,6 +8104,14 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
if (intel_crtc->config->dither)
val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
+ if (hdmi_out) {
+ val |= PIPEMISC_OUTPUT_YCBCR;
+ if (hdmi_out == DRM_HDMI_OUTPUT_YCBCR420) {
+ val |= PIPEMISC_YCBCR420_ENABLE |
+ PIPEMISC_YCBCR420_MODE_BLEND;
+ }
+ }
+
I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
}
}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 98902d4..2a336d7 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -454,7 +454,8 @@ struct intel_crtc_scaler_state {
*
* If a bit is set, a user is using a scaler.
* Here user can be a plane or crtc as defined below:
- * bits 0-30 - plane (bit position is index from drm_plane_index)
+ * bits 0-29 - plane (bit position is index from drm_plane_index)
+ * bit 30 - hdmi output
* bit 31 - crtc
*
* Instead of creating a new index to cover planes and crtc, using
@@ -467,6 +468,12 @@ struct intel_crtc_scaler_state {
* avilability.
*/
#define SKL_CRTC_INDEX 31
+
+ /*
+ * HDMI YCBCR 420 output consume a scaler. So adding a user
+ * for HDMI output 420 requirement.
+ */
+#define SKL_HDMI_OUTPUT_INDEX 30
unsigned scaler_users;
/* scaler used by crtc for panel fitting purpose */
@@ -1450,6 +1457,7 @@ void intel_mode_from_pipe_config(struct drm_display_mode
*mode,
struct intel_crtc_state *pipe_config);
int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state);
+int skl_update_scaler_crtc_hdmi_output(struct intel_crtc_state *state);
int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state
*crtc_state);
static inline u32 intel_plane_ggtt_offset(const struct intel_plane_state
*state)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
b/drivers/gpu/drm/i915/intel_hdmi.c
index 40d3414..f0826a5 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1412,6 +1412,7 @@ intel_hdmi_compute_ycbcr_config(struct
drm_connector_state *conn_state,
{
struct drm_connector *connector = conn_state->connector;
struct drm_display_info *info = &connector->display_info;
+ struct intel_crtc *intel_crtc = to_intel_crtc(conn_state->crtc);
struct drm_display_mode *mode = &config->base.adjusted_mode;
enum drm_hdmi_output_type type = conn_state->hdmi_output;
@@ -1455,6 +1456,16 @@ intel_hdmi_compute_ycbcr_config(struct
drm_connector_state *conn_state,
config->port_clock /= 2;
*clock_12bpc /= 2;
*clock_8bpc /= 2;
+
+ /* ycbcr 420 output conversion needs a scaler */
+ if (skl_update_scaler_crtc_hdmi_output(config)) {
+ DRM_ERROR("Scaler allocation for output failed\n");
+ return DRM_HDMI_OUTPUT_INVALID;
+ }
+
+ /* Bind this scaler to pipe */
+ intel_pch_panel_fitting(intel_crtc, config,
+ DRM_MODE_SCALE_FULLSCREEN);
break;
case DRM_HDMI_OUTPUT_YCBCR422:
diff --git a/drivers/gpu/drm/i915/intel_panel.c
b/drivers/gpu/drm/i915/intel_panel.c
index cb50c52..b20aa1e 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -110,7 +110,8 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
/* Native modes don't need fitting */
if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
- adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
+ adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
+ pipe_config->hdmi_output != DRM_HDMI_OUTPUT_YCBCR420)
goto done;
switch (fitting_mode) {
--
2.7.4
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