MTL+ supports fractional compressed bits_per_pixel, with precision of
1/16. This compressed bpp is stored in U6.4 format.
Accommodate this precision while computing m_n values.
v1:
Replace the computation of 'data_clock' with 'data_clock =
DIV_ROUND_UP(data_clock, 16).' (Sui Jingfeng).
v2:
Rebase and pass bits_per_pixel in U6.4 format.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
Reviewed-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display.c | 4 ++--
drivers/gpu/drm/i915/display/intel_dp.c | 16 ++++++++--------
drivers/gpu/drm/i915/display/intel_dp_mst.c | 14 +++++++-------
drivers/gpu/drm/i915/display/intel_fdi.c | 3 ++-
4 files changed, 19 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index b4a8e3087e50..125903007a29 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2415,12 +2415,12 @@ add_bw_alloc_overhead(int link_clock, int bw_overhead,
}
void
-intel_link_compute_m_n(u16 bits_per_pixel, int nlanes,
+intel_link_compute_m_n(u16 bits_per_pixel_x16, int nlanes,
int pixel_clock, int link_clock,
int bw_overhead,
struct intel_link_m_n *m_n)
{
- u32 data_clock = bits_per_pixel * pixel_clock;
+ u32 data_clock = DIV_ROUND_UP(bits_per_pixel_x16 * pixel_clock, 16);
u32 data_m;
u32 data_n;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 4ad3718c3c7d..246f50d1f030 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2663,7 +2663,7 @@ static bool can_enable_drrs(struct intel_connector *connector,
static void
intel_dp_drrs_compute_config(struct intel_connector *connector,
struct intel_crtc_state *pipe_config,
- int link_bpp)
+ int link_bpp_x16)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
const struct drm_display_mode *downclock_mode =
@@ -2688,7 +2688,7 @@ intel_dp_drrs_compute_config(struct intel_connector *connector,
if (pipe_config->splitter.enable)
pixel_clock /= pipe_config->splitter.link_count;
- intel_link_compute_m_n(link_bpp, pipe_config->lane_count, pixel_clock,
+ intel_link_compute_m_n(link_bpp_x16, pipe_config->lane_count, pixel_clock,
pipe_config->port_clock,
intel_dp_bw_fec_overhead(pipe_config->fec_enable),
&pipe_config->dp_m2_n2);
@@ -2792,7 +2792,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
const struct drm_display_mode *fixed_mode;
struct intel_connector *connector = intel_dp->attached_connector;
- int ret = 0, link_bpp;
+ int ret = 0, link_bpp_x16;
if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv) && encoder->port != PORT_A)
pipe_config->has_pch_encoder = true;
@@ -2841,10 +2841,10 @@ intel_dp_compute_config(struct intel_encoder *encoder,
drm_dp_enhanced_frame_cap(intel_dp->dpcd);
if (pipe_config->dsc.compression_enable)
- link_bpp = to_bpp_int(pipe_config->dsc.compressed_bpp_x16);
+ link_bpp_x16 = pipe_config->dsc.compressed_bpp_x16;
else
- link_bpp = intel_dp_output_bpp(pipe_config->output_format,
- pipe_config->pipe_bpp);
+ link_bpp_x16 = to_bpp_x16(intel_dp_output_bpp(pipe_config->output_format,
+ pipe_config->pipe_bpp));
if (intel_dp->mso_link_count) {
int n = intel_dp->mso_link_count;
@@ -2868,7 +2868,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
intel_dp_audio_compute_config(encoder, pipe_config, conn_state);
- intel_link_compute_m_n(link_bpp,
+ intel_link_compute_m_n(link_bpp_x16,
pipe_config->lane_count,
adjusted_mode->crtc_clock,
pipe_config->port_clock,
@@ -2884,7 +2884,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
intel_vrr_compute_config(pipe_config, conn_state);
intel_psr_compute_config(intel_dp, pipe_config, conn_state);
- intel_dp_drrs_compute_config(connector, pipe_config, link_bpp);
+ intel_dp_drrs_compute_config(connector, pipe_config, link_bpp_x16);
intel_dp_compute_vsc_sdp(intel_dp, pipe_config, conn_state);
intel_dp_compute_hdr_metadata_infoframe_sdp(intel_dp, pipe_config, conn_state);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 31461ea25f7c..5c7e9d296483 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -70,7 +70,7 @@ static int intel_dp_mst_check_constraints(struct drm_i915_private *i915, int bpp
static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
const struct intel_connector *connector,
- bool ssc, bool dsc, int bpp)
+ bool ssc, bool dsc, int bpp_x16)
{
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
@@ -94,7 +94,7 @@ static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
overhead = drm_dp_bw_overhead(crtc_state->lane_count,
adjusted_mode->hdisplay,
dsc_slice_count,
- to_bpp_x16(bpp),
+ bpp_x16,
flags);
/*
@@ -107,16 +107,16 @@ static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
const struct intel_connector *connector,
bool ssc, bool dsc,
- int bpp,
+ int bpp_x16,
struct intel_link_m_n *m_n)
{
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
int overhead = intel_dp_mst_bw_overhead(crtc_state,
connector,
- ssc, dsc, bpp);
+ ssc, dsc, bpp_x16);
- intel_link_compute_m_n(bpp, crtc_state->lane_count,
+ intel_link_compute_m_n(bpp_x16, crtc_state->lane_count,
adjusted_mode->crtc_clock,
crtc_state->port_clock,
overhead,
@@ -180,9 +180,9 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
link_bpp = dsc ? bpp :
intel_dp_output_bpp(crtc_state->output_format, bpp);
- intel_dp_mst_compute_m_n(crtc_state, connector, false, dsc, link_bpp,
+ intel_dp_mst_compute_m_n(crtc_state, connector, false, dsc, to_bpp_x16(link_bpp),
&crtc_state->dp_m_n);
- intel_dp_mst_compute_m_n(crtc_state, connector, true, dsc, link_bpp,
+ intel_dp_mst_compute_m_n(crtc_state, connector, true, dsc, to_bpp_x16(link_bpp),
&remote_m_n);
/*
diff --git a/drivers/gpu/drm/i915/display/intel_fdi.c b/drivers/gpu/drm/i915/display/intel_fdi.c
index 1d87fbc1e813..295a0f24ebbf 100644
--- a/drivers/gpu/drm/i915/display/intel_fdi.c
+++ b/drivers/gpu/drm/i915/display/intel_fdi.c
@@ -339,7 +339,8 @@ int ilk_fdi_compute_config(struct intel_crtc *crtc,
pipe_config->fdi_lanes = lane;
- intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
+ intel_link_compute_m_n(to_bpp_x16(pipe_config->pipe_bpp),
+ lane, fdi_dotclock,
link_bw,
intel_dp_bw_fec_overhead(false),
&pipe_config->fdi_m_n);
--
2.40.1
