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drm/i915/dp: Add intel_dp_dsc_get_slice_config()

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Add intel_dp_dsc_get_slice_config() to compute the detailed slice
configuration and determine the slices-per-line value (returned by
intel_dp_dsc_get_slice_count()) using this function.

v2: Fix incorrectly returning false from intel_dp_dsc_min_slice_count()
    due to rebase fail. (Jouni)

Cc: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260114162232.92731-15-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-01-14 18:22:31 +02:00
parent 088d06bb17
commit 54cf7900c6
1 changed files with 25 additions and 6 deletions
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31
drivers/gpu/drm/i915/display/intel_dp.c
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@ -1019,9 +1019,11 @@ static int intel_dp_dsc_min_slice_count(const struct intel_connector *connector,
return min_slice_count;
}
u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
int mode_clock, int mode_hdisplay,
int num_joined_pipes)
static bool
intel_dp_dsc_get_slice_config(const struct intel_connector *connector,
int mode_clock, int mode_hdisplay,
int num_joined_pipes,
struct intel_dsc_slice_config *config_ret)
{
struct intel_display *display = to_intel_display(connector);
int min_slice_count =
@ -1058,8 +1060,11 @@ u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
if (mode_hdisplay % slices_per_line)
continue;
if (min_slice_count <= slices_per_line)
return slices_per_line;
if (min_slice_count <= slices_per_line) {
*config_ret = config;
return true;
}
}
/* Print slice count 1,2,4,..24 if bit#0,1,3,..23 is set in the mask. */
@ -1070,7 +1075,21 @@ u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
min_slice_count,
(int)BITS_PER_TYPE(sink_slice_count_mask), &sink_slice_count_mask);
return 0;
return false;
}
u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
int mode_clock, int mode_hdisplay,
int num_joined_pipes)
{
struct intel_dsc_slice_config config;
if (!intel_dp_dsc_get_slice_config(connector,
mode_clock, mode_hdisplay,
num_joined_pipes, &config))
return 0;
return intel_dsc_line_slice_count(&config);
}
static bool source_can_output(struct intel_dp *intel_dp,