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drm/i915/dsc: Track the detaild DSC slice configuration

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Add a way to track the detailed DSC pipes-per-line, streams-per-pipe,
slices-per-stream configuration instead of the current streams-per-pipe
and slices-per-line value. This way describes the slice configuration in
a clearer way, for instance providing a

2 pipes-per-line x 2 streams-per-pipe x 2 slices-per-stream = 8 slices-per-line

view, instead of the current, coarser

2 streams-per-pipe, 8 slices-per-line

view, the former better reflecting that each DSC stream engine has 2
slices. This also let's optimizing the configuration in a
simpler/clearer way, for instance using 1 stream x 2 slices, or 1 stream
x 4 slices instead of the current 2 stream x 1 slice, or 2 streams x 2
slices configuration (so that 1 DSC stream engine can be powered off in
each pipe).

Follow-up changes will convert the current slices-per-line computation
logic to compute instead the above detailed slice configuration.

Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260114162232.92731-2-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-01-14 18:22:18 +02:00
parent d30f75d2db
commit 889ff8dd46
3 changed files with 12 additions and 0 deletions
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5
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@ -1333,6 +1333,11 @@ struct intel_crtc_state {
bool compression_enabled_on_link;
bool compression_enable;
int num_streams;
struct intel_dsc_slice_config {
int pipes_per_line;
int streams_per_pipe;
int slices_per_stream;
} slice_config;
/* Compressed Bpp in U6.4 format (first 4 bits for fractional part) */
u16 compressed_bpp_x16;
u8 slice_count;

5
drivers/gpu/drm/i915/display/intel_vdsc.c
View File

@ -35,6 +35,11 @@ bool intel_dsc_source_support(const struct intel_crtc_state *crtc_state)
return true;
}
int intel_dsc_line_slice_count(const struct intel_dsc_slice_config *config)
{
return config->pipes_per_line * config->streams_per_pipe * config->slices_per_stream;
}
static bool is_pipe_dsc(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
{
struct intel_display *display = to_intel_display(crtc);

2
drivers/gpu/drm/i915/display/intel_vdsc.h
View File

@ -13,9 +13,11 @@ struct drm_printer;
enum transcoder;
struct intel_crtc;
struct intel_crtc_state;
struct intel_dsc_slice_config;
struct intel_encoder;
bool intel_dsc_source_support(const struct intel_crtc_state *crtc_state);
int intel_dsc_line_slice_count(const struct intel_dsc_slice_config *config);
void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state);
void intel_dsc_enable(const struct intel_crtc_state *crtc_state);
void intel_dsc_disable(const struct intel_crtc_state *crtc_state);