[PATCH 04/22] drm/i915/dp: Update the link bpp limits for DSC mode
Imre Deak
imre.deak at intel.com
Mon Sep 4 09:58:39 UTC 2023
In non-DSC mode the link bpp can be set in 2*3 bpp steps in the pipe bpp
range, while in DSC mode it can be set in 1/16 bpp steps to any value
up to the maximum pipe bpp. Update the limits accordingly in both modes
to prepare for a follow-up patch which may need to reduce the max link
bpp value and starts to check the link bpp limits in DSC mode as well.
While at it add more detail to the link limit debug print and print it
also for DSC mode.
v2:
- Add to_bpp_frac_dec() instead of open coding it. (Jani)
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
.../drm/i915/display/intel_display_types.h | 5 ++
drivers/gpu/drm/i915/display/intel_dp.c | 89 +++++++++++++++----
drivers/gpu/drm/i915/display/intel_dp.h | 6 ++
drivers/gpu/drm/i915/display/intel_dp_mst.c | 23 +++--
4 files changed, 101 insertions(+), 22 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 67a3f6a24d77a..fe8abbacc4fe7 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -2113,6 +2113,11 @@ static inline int to_bpp_int(int bpp_x16)
return bpp_x16 >> 4;
}
+static inline int to_bpp_frac_dec(int bpp_x16)
+{
+ return (bpp_x16 & 0xf) * 625;
+}
+
static inline int to_bpp_x16(int bpp)
{
return bpp << 4;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 5a91735b3e6f6..6b287648cafc8 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2190,16 +2190,68 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
return 0;
}
-static void
+/**
+ * intel_dp_compute_config_link_bpp_limits - compute output link bpp limits
+ * @intel_dp: intel DP
+ * @crtc_state: crtc state
+ * @dsc: DSC compression mode
+ * @limits: link configuration limits
+ *
+ * Calculates the output link min, max bpp values in @limits based on the
+ * pipe bpp range, @crtc_state and @dsc mode.
+ *
+ * Returns %true in case of success.
+ */
+bool
+intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
+ const struct intel_crtc_state *crtc_state,
+ bool dsc,
+ struct link_config_limits *limits)
+{
+ struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+ const struct drm_display_mode *adjusted_mode =
+ &crtc_state->hw.adjusted_mode;
+ const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ const struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
+ int max_link_bpp_x16;
+
+ max_link_bpp_x16 = to_bpp_x16(limits->pipe.max_bpp);
+
+ if (!dsc) {
+ max_link_bpp_x16 = rounddown(max_link_bpp_x16, to_bpp_x16(2 * 3));
+
+ if (max_link_bpp_x16 < to_bpp_x16(limits->pipe.min_bpp))
+ return false;
+
+ limits->link.min_bpp_x16 = to_bpp_x16(limits->pipe.min_bpp);
+ } else {
+ limits->link.min_bpp_x16 = 0;
+ }
+
+ limits->link.max_bpp_x16 = max_link_bpp_x16;
+
+ drm_dbg_kms(&i915->drm,
+ "[ENCODER:%d:%s][CRTC:%d:%s] DP link limits: pixel clock %d kHz DSC %s max lanes %d max rate %d max pipe_bpp %d max link_bpp %d.%04d\n",
+ encoder->base.base.id, encoder->base.name,
+ crtc->base.base.id, crtc->base.name,
+ adjusted_mode->crtc_clock,
+ dsc ? "on" : "off",
+ limits->max_lane_count,
+ limits->max_rate,
+ limits->pipe.max_bpp,
+ to_bpp_int(limits->link.max_bpp_x16),
+ to_bpp_frac_dec(limits->link.max_bpp_x16));
+
+ return true;
+}
+
+static bool
intel_dp_compute_config_limits(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state,
bool respect_downstream_limits,
+ bool dsc,
struct link_config_limits *limits)
{
- struct drm_i915_private *i915 = dp_to_i915(intel_dp);
- const struct drm_display_mode *adjusted_mode =
- &crtc_state->hw.adjusted_mode;
-
limits->min_rate = intel_dp_common_rate(intel_dp, 0);
limits->max_rate = intel_dp_max_link_rate(intel_dp);
@@ -2225,13 +2277,10 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
intel_dp_adjust_compliance_config(intel_dp, crtc_state, limits);
- limits->link.min_bpp_x16 = to_bpp_x16(limits->pipe.min_bpp);
- limits->link.max_bpp_x16 = to_bpp_x16(limits->pipe.max_bpp);
-
- drm_dbg_kms(&i915->drm, "DP link computation with max lane count %i "
- "max rate %d max bpp %d pixel clock %iKHz\n",
- limits->max_lane_count, limits->max_rate,
- to_bpp_int(limits->link.max_bpp_x16), adjusted_mode->crtc_clock);
+ return intel_dp_compute_config_link_bpp_limits(intel_dp,
+ crtc_state,
+ dsc,
+ limits);
}
static int
@@ -2250,9 +2299,6 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
bool dsc_needed;
int ret = 0;
- intel_dp_compute_config_limits(intel_dp, pipe_config,
- respect_downstream_limits, &limits);
-
if (intel_dp_need_bigjoiner(intel_dp, adjusted_mode->crtc_hdisplay,
adjusted_mode->crtc_clock))
pipe_config->bigjoiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
@@ -2264,7 +2310,11 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
*/
joiner_needs_dsc = DISPLAY_VER(i915) < 13 && pipe_config->bigjoiner_pipes;
- dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en;
+ dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
+ !intel_dp_compute_config_limits(intel_dp, pipe_config,
+ respect_downstream_limits,
+ false,
+ &limits);
if (!dsc_needed) {
/*
@@ -2281,6 +2331,13 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
drm_dbg_kms(&i915->drm, "Try DSC (fallback=%s, joiner=%s, force=%s)\n",
str_yes_no(ret), str_yes_no(joiner_needs_dsc),
str_yes_no(intel_dp->force_dsc_en));
+
+ if (!intel_dp_compute_config_limits(intel_dp, pipe_config,
+ respect_downstream_limits,
+ true,
+ &limits))
+ return -EINVAL;
+
ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
conn_state, &limits, 64, true);
if (ret < 0)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 98c60ab6e182e..2cf3681bac64a 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -156,4 +156,10 @@ void intel_dp_phy_test(struct intel_encoder *encoder);
void intel_dp_wait_source_oui(struct intel_dp *intel_dp);
int intel_dp_output_bpp(enum intel_output_format output_format, int bpp);
+bool
+intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
+ const struct intel_crtc_state *crtc_state,
+ bool dsc,
+ struct link_config_limits *limits);
+
#endif /* __INTEL_DP_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index bfda30db68805..23b3039c15acd 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -295,9 +295,10 @@ static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
return 0;
}
-static void
+static bool
intel_dp_mst_compute_config_limits(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state,
+ bool dsc,
struct link_config_limits *limits)
{
/*
@@ -323,8 +324,10 @@ intel_dp_mst_compute_config_limits(struct intel_dp *intel_dp,
intel_dp_adjust_compliance_config(intel_dp, crtc_state, limits);
- limits->link.min_bpp_x16 = to_bpp_x16(limits->pipe.min_bpp);
- limits->link.max_bpp_x16 = to_bpp_x16(limits->pipe.max_bpp);
+ return intel_dp_compute_config_link_bpp_limits(intel_dp,
+ crtc_state,
+ dsc,
+ limits);
}
static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
@@ -347,9 +350,11 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
pipe_config->has_pch_encoder = false;
- intel_dp_mst_compute_config_limits(intel_dp, pipe_config, &limits);
-
- dsc_needed = intel_dp->force_dsc_en;
+ dsc_needed = intel_dp->force_dsc_en ||
+ !intel_dp_mst_compute_config_limits(intel_dp,
+ pipe_config,
+ false,
+ &limits);
if (!dsc_needed) {
ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
@@ -368,6 +373,12 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
str_yes_no(ret),
str_yes_no(intel_dp->force_dsc_en));
+ if (!intel_dp_mst_compute_config_limits(intel_dp,
+ pipe_config,
+ true,
+ &limits))
+ return -EINVAL;
+
/*
* FIXME: As bpc is hardcoded to 8, as mentioned above,
* WARN and ignore the debug flag force_dsc_bpc for now.
--
2.37.2
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