From 9f3d3fd789223db4aaddb18eab552219aec06d7a Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Thu, 21 Sep 2023 22:51:53 +0300
Subject: drm/i915/dp: Limit the output link bpp in DSC mode
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 592b9bfd25e471bfe9a4bb4365d86a9dccc807cc
Patch-mainline: v6.7-rc1
References: jsc#PED-3527 jsc#PED-5475 jsc#PED-6068 jsc#PED-6070 jsc#PED-6116 jsc#PED-6120 jsc#PED-5065 jsc#PED-5477 jsc#PED-5511 jsc#PED-6041 jsc#PED-6069 jsc#PED-6071
Limit the output link bpp in DSC mode to the link_config_limits
link.min_bpp_x16 .. max_bpp_x16 range the same way it's done in non-DSC
mode. Atm this doesn't make a difference, the link bpp range being
0 .. max pipe bpp, but a follow-up patch will need a way to reduce max
link bpp below its current value.
v2:
- Add to_bpp_int_roundup() instead of open coding it. (Jani)
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230921195159.2646027-6-imre.deak@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/display/intel_display_types.h | 5 +++++
drivers/gpu/drm/i915/display/intel_dp.c | 4 ++++
drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 +++
3 files changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index a71af7ef0737..3c6bb1cb5b44 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -2128,6 +2128,11 @@ static inline int to_bpp_frac(int bpp_x16)
#define BPP_X16_FMT "%d.%04d"
#define BPP_X16_ARGS(bpp_x16) to_bpp_int(bpp_x16), (to_bpp_frac(bpp_x16) * 625)
+static inline int to_bpp_int_roundup(int bpp_x16)
+{
+ return (bpp_x16 + 0xf) >> 4;
+}
+
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 68844c36622a..9275e8557ce5 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1925,6 +1925,7 @@ static int dsc_compute_compressed_bpp(struct intel_dp *intel_dp,
dsc_src_min_bpp = dsc_src_min_compressed_bpp();
dsc_sink_min_bpp = dsc_sink_min_compressed_bpp(pipe_config);
dsc_min_bpp = max(dsc_src_min_bpp, dsc_sink_min_bpp);
+ dsc_min_bpp = max(dsc_min_bpp, to_bpp_int_roundup(limits->link.min_bpp_x16));
dsc_src_max_bpp = dsc_src_max_compressed_bpp(intel_dp);
dsc_sink_max_bpp = dsc_sink_max_compressed_bpp(intel_dp, pipe_config, pipe_bpp / 3);
@@ -1934,6 +1935,7 @@ static int dsc_compute_compressed_bpp(struct intel_dp *intel_dp,
adjusted_mode->hdisplay,
pipe_config->bigjoiner_pipes);
dsc_max_bpp = min(dsc_max_bpp, dsc_joiner_max_bpp);
+ dsc_max_bpp = min(dsc_max_bpp, to_bpp_int(limits->link.max_bpp_x16));
if (DISPLAY_VER(i915) >= 13)
return xelpd_dsc_compute_link_config(intel_dp, pipe_config, limits,
@@ -2079,10 +2081,12 @@ static int intel_edp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
dsc_src_min_bpp = dsc_src_min_compressed_bpp();
dsc_sink_min_bpp = dsc_sink_min_compressed_bpp(pipe_config);
dsc_min_bpp = max(dsc_src_min_bpp, dsc_sink_min_bpp);
+ dsc_min_bpp = max(dsc_min_bpp, to_bpp_int_roundup(limits->link.min_bpp_x16));
dsc_src_max_bpp = dsc_src_max_compressed_bpp(intel_dp);
dsc_sink_max_bpp = dsc_sink_max_compressed_bpp(intel_dp, pipe_config, pipe_bpp / 3);
dsc_max_bpp = dsc_sink_max_bpp ? min(dsc_sink_max_bpp, dsc_src_max_bpp) : dsc_src_max_bpp;
+ dsc_max_bpp = min(dsc_max_bpp, to_bpp_int(limits->link.max_bpp_x16));
/* Compressed BPP should be less than the Input DSC bpp */
dsc_max_bpp = min(dsc_max_bpp, pipe_bpp - 1);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 32327293bd43..d84eb06269a9 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -233,6 +233,9 @@ static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
if (max_bpp > sink_max_bpp)
max_bpp = sink_max_bpp;
+ min_bpp = max(min_bpp, to_bpp_int_roundup(limits->link.min_bpp_x16));
+ max_bpp = min(max_bpp, to_bpp_int(limits->link.max_bpp_x16));
+
slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, max_bpp,
min_bpp, limits,
conn_state, 2 * 3, true);
--
2.43.0