[PATCH 2/6] drm/i915/psr: Tie PSR2 support to Y coordinate requirement in intel_psr_init_dpcd()

José Roberto de Souza
2018-03-14T22:39:20Z

Move to only one place the sink requirements that the actual driver
needs to enable PSR2.

Also intel_psr2_config_valid() is called every time the crtc config
is computed, wasting some time every time it was checking for
Y coordinate requirement.

This allow us to nuke y_cord_support and some of VSC setup code that
was handling a scenario that would never happen(PSR2 without Y
coordinate).

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 -
drivers/gpu/drm/i915/intel_psr.c | 55 ++++++++++++++++++++--------------------
2 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8a584273f897..d4bc8d18f56c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -603,7 +603,6 @@ struct i915_psr {
unsigned busy_frontbuffer_bits;
bool psr2_support;
bool link_standby;
- bool y_cord_support;
bool colorimetry_support;
bool alpm;
bool has_hw_tracking;
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 9811f5f0bc75..62d97d5576d1 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -93,7 +93,7 @@ static void psr_aux_io_power_put(struct intel_dp *intel_dp)
intel_display_power_put(dev_priv, psr_aux_domain(intel_dp));
}

-static bool intel_dp_get_y_cord_status(struct intel_dp *intel_dp)
+static bool intel_dp_get_y_coord_required(struct intel_dp *intel_dp)
{
uint8_t psr_caps = 0;

@@ -137,22 +137,38 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)

if (INTEL_GEN(dev_priv) >= 9 &&
(intel_dp->psr_dpcd[0] & DP_PSR2_IS_SUPPORTED)) {
- uint8_t frame_sync_cap;
+ uint8_t frame_sync_cap, y_coord_req;

dev_priv->psr.sink_support = true;
+
+ /* PSR2 needs frame sync to do selective updates */
if (drm_dp_dpcd_readb(&intel_dp->aux,
DP_SINK_DEVICE_AUX_FRAME_SYNC_CAP,
&frame_sync_cap) != 1)
frame_sync_cap = 0;
frame_sync_cap = (frame_sync_cap & DP_AUX_FRAME_SYNC_CAP);
- /* PSR2 needs frame sync as well */
- dev_priv->psr.psr2_support = frame_sync_cap;
- DRM_DEBUG_KMS("PSR2 %s on sink",
- dev_priv->psr.psr2_support ? "supported" : "not supported");
+
+ /*
+ * FIXME: Enable PSR2 only for y-coordinate PSR2 panels
+ * After GTC implementation, remove this restriction.
+ *
+ * All panels that supports PSR version 3 that is
+ * PSR2 + Y-coordinate support can handle Y coordinates in VSC
+ * but we are only sure that it is going to be used when
+ * required by the panel. This way panel is capable to do
+ * selective update even without a valid aux frame sync.
+ */
+ y_coord_req = intel_dp_get_y_coord_required(intel_dp);
+
+ dev_priv->psr.psr2_support = frame_sync_cap && y_coord_req;
+ if (dev_priv->psr.psr2_support)
+ DRM_DEBUG_KMS("PSR2 supported on sink\n");
+ else
+ DRM_DEBUG_KMS("PSR2 not supported on sink"
+ "(frame sync: %d Y-coord required: %d)\n",
+ frame_sync_cap, y_coord_req);

if (dev_priv->psr.psr2_support) {
- dev_priv->psr.y_cord_support =
- intel_dp_get_y_cord_status(intel_dp);
dev_priv->psr.colorimetry_support =
intel_dp_get_colorimetry_status(intel_dp);
dev_priv->psr.alpm =
@@ -198,16 +214,12 @@ static void hsw_psr_setup_vsc(struct intel_dp *intel_dp,
memset(&psr_vsc, 0, sizeof(psr_vsc));
psr_vsc.sdp_header.HB0 = 0;
psr_vsc.sdp_header.HB1 = 0x7;
- if (dev_priv->psr.colorimetry_support &&
- dev_priv->psr.y_cord_support) {
+ if (dev_priv->psr.colorimetry_support) {
psr_vsc.sdp_header.HB2 = 0x5;
psr_vsc.sdp_header.HB3 = 0x13;
- } else if (dev_priv->psr.y_cord_support) {
+ } else {
psr_vsc.sdp_header.HB2 = 0x4;
psr_vsc.sdp_header.HB3 = 0xe;
- } else {
- psr_vsc.sdp_header.HB2 = 0x3;
- psr_vsc.sdp_header.HB3 = 0xc;
}
} else {
/* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
@@ -478,15 +490,6 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
return false;
}

- /*
- * FIXME:enable psr2 only for y-cordinate psr2 panels
- * After gtc implementation , remove this restriction.
- */
- if (!dev_priv->psr.y_cord_support) {
- DRM_DEBUG_KMS("PSR2 not enabled, panel does not support Y coordinate\n");
- return false;
- }
-
return true;
}

@@ -586,14 +589,12 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp,
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
- u32 chicken;

psr_aux_io_power_get(intel_dp);

if (dev_priv->psr.psr2_support) {
- chicken = PSR2_VSC_ENABLE_PROG_HEADER;
- if (dev_priv->psr.y_cord_support)
- chicken |= PSR2_ADD_VERTICAL_LINE_COUNT;
+ u32 chicken = PSR2_VSC_ENABLE_PROG_HEADER
+ | PSR2_ADD_VERTICAL_LINE_COUNT;
I915_WRITE(CHICKEN_TRANS(cpu_transcoder), chicken);

I915_WRITE(EDP_PSR_DEBUG,
--
2.16.2