[Intel-gfx] [PATCH 4/4] drm/i915: Extract drm_dp_atomic_find_vcpi_slots cycle to separate function

Stanislav Lisovskiy
2022-08-26T09:20:07Z

We are using almost same code to loop through bpps while calling
drm_dp_atomic_find_vcpi_slots - lets remove this duplication by
introducing a new function intel_dp_mst_find_vcpi_slots_for_bpp

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 85 +++++++++++----------
1 file changed, 44 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 630450bd22a2..b393c97f3fb8 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -44,10 +44,14 @@
#include "intel_hotplug.h"
#include "skl_scaler.h"

-static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
- struct intel_crtc_state *crtc_state,
- struct drm_connector_state *conn_state,
- struct link_config_limits *limits)
+static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
+ struct intel_crtc_state *crtc_state,
+ int max_bpp,
+ int min_bpp,
+ struct link_config_limits *limits,
+ struct drm_connector_state *conn_state,
+ int step,
+ bool dsc)
{
struct drm_atomic_state *state = crtc_state->uapi.state;
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
@@ -57,26 +61,26 @@ static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
struct drm_i915_private *i915 = to_i915(connector->base.dev);
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
- bool constant_n = drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_CONSTANT_N);
int bpp, slots = -EINVAL;
int ret = 0;

crtc_state->lane_count = limits->max_lane_count;
crtc_state->port_clock = limits->max_rate;

- for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
+ for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
crtc_state->pipe_bpp = bpp;

crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
- crtc_state->pipe_bpp,
- false);
+ dsc ? bpp << 4 : crtc_state->pipe_bpp,
+ dsc);

slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
connector->port,
crtc_state->pbn,
- drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
- crtc_state->port_clock,
- crtc_state->lane_count));
+ !dsc ? drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
+ crtc_state->port_clock,
+ crtc_state->lane_count)
+ : 0);
if (slots == -EDEADLK)
return slots;
if (slots >= 0) {
@@ -94,11 +98,32 @@ static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
if (ret && slots >= 0)
slots = ret;

- if (slots < 0) {
+ if (slots < 0)
drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
slots);
+
+ return slots;
+}
+
+
+static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
+ struct intel_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state,
+ struct link_config_limits *limits)
+{
+ const struct drm_display_mode *adjusted_mode =
+ &crtc_state->hw.adjusted_mode;
+ struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+ struct intel_dp *intel_dp = &intel_mst->primary->dp;
+ bool constant_n = drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_CONSTANT_N);
+ int slots = -EINVAL;
+
+ slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, limits->max_bpp,
+ limits->min_bpp, limits,
+ conn_state, 2 * 3, false);
+
+ if (slots < 0)
return slots;
- }

intel_link_compute_m_n(crtc_state->pipe_bpp,
crtc_state->lane_count,
@@ -116,25 +141,21 @@ static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
struct drm_connector_state *conn_state,
struct link_config_limits *limits)
{
- struct drm_atomic_state *state = crtc_state->uapi.state;
- struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
- struct intel_dp *intel_dp = &intel_mst->primary->dp;
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
+ struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+ struct intel_dp *intel_dp = &intel_mst->primary->dp;
struct drm_i915_private *i915 = to_i915(connector->base.dev);
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
DP_DPCD_QUIRK_CONSTANT_N);
- int bpp, slots = -EINVAL;
+ int slots = -EINVAL;
int i, num_bpc;
u8 dsc_bpc[3] = {0};
int min_bpp, max_bpp;
u8 dsc_max_bpc;

- crtc_state->lane_count = limits->max_lane_count;
- crtc_state->port_clock = limits->max_rate;
-
/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
if (DISPLAY_VER(i915) >= 12)
dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
@@ -155,29 +176,11 @@ static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
drm_dbg_kms(&i915->drm, "DSC Sink supported min bpp %d max bpp %d\n",
min_bpp, max_bpp);

- for (bpp = max_bpp; bpp >= min_bpp; bpp -= 2 * 3) {
- crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
- bpp << 4,
- true);
+ slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, max_bpp, min_bpp,
+ limits, conn_state, 2 * 3, true);

- slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
- connector->port,
- crtc_state->pbn, 0);
-
- drm_dbg_kms(&i915->drm, "Trying bpp %d got %d pbn %d slots\n",
- bpp, crtc_state->pbn, slots);
-
- if (slots == -EDEADLK)
- return slots;
- if (slots >= 0)
- break;
- }
-
- if (slots < 0) {
- drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
- slots);
+ if (slots < 0)
return slots;
- }

intel_link_compute_m_n(crtc_state->pipe_bpp,
crtc_state->lane_count,
--
2.24.1.485.gad05a3d8e5