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| author | Imre Deak <imre.deak@intel.com> | 2025-05-09 21:03:34 +0300 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2025-05-12 15:22:49 +0300 |
| commit | 7acc7a6fc77413ab061819cee2ab7771c4132cf0 (patch) | |
| tree | d36fc4d2a11a631d7d51e69ad29a4b093844475e /drivers/gpu | |
| parent | drm/i915/dp_mst: Simplify computing the min/max compressed bpp limits (diff) | |
| download | linux-7acc7a6fc77413ab061819cee2ab7771c4132cf0.tar.gz linux-7acc7a6fc77413ab061819cee2ab7771c4132cf0.zip | |
drm/i915/dp: Limit max link bpp properly to a fractional value on SST
The maximum link bpp - determined by the link BW for instance - can be
fractional, handle this properly during computing the link bpp on SST.
This keeps the pipe joiner specific maximum link bpp as a rounded-down
integer value still, changing that to a fractional value is left for
later.
v2: Align the min/max bpp value to the bpp step.
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250509180340.554867-8-imre.deak@intel.com
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index f8de29d8a4da..b91c1e43051a 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -27,6 +27,8 @@ #include <linux/export.h> #include <linux/i2c.h> +#include <linux/log2.h> +#include <linux/math.h> #include <linux/notifier.h> #include <linux/seq_buf.h> #include <linux/slab.h> @@ -939,6 +941,7 @@ static u32 ultrajoiner_ram_max_bpp(u32 mode_hdisplay) return ultrajoiner_ram_bits() / mode_hdisplay; } +/* TODO: return a bpp_x16 value */ static u32 get_max_compressed_bpp_with_joiner(struct intel_display *display, u32 mode_clock, u32 mode_hdisplay, @@ -2153,24 +2156,16 @@ static int dsc_compute_compressed_bpp(struct intel_dp *intel_dp, const struct intel_connector *connector = to_intel_connector(conn_state->connector); const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode; int output_bpp; - int dsc_min_bpp; - int dsc_max_bpp; int min_bpp_x16, max_bpp_x16, bpp_step_x16; int dsc_joiner_max_bpp; int num_joined_pipes = intel_crtc_num_joined_pipes(pipe_config); int bpp_x16; int ret; - dsc_min_bpp = fxp_q4_to_int_roundup(limits->link.min_bpp_x16); - dsc_joiner_max_bpp = get_max_compressed_bpp_with_joiner(display, adjusted_mode->clock, adjusted_mode->hdisplay, num_joined_pipes); - dsc_max_bpp = min(dsc_joiner_max_bpp, fxp_q4_to_int(limits->link.max_bpp_x16)); - - /* FIXME: remove the round trip via integers */ - min_bpp_x16 = fxp_q4_from_int(dsc_min_bpp); - max_bpp_x16 = fxp_q4_from_int(dsc_max_bpp); + max_bpp_x16 = min(fxp_q4_from_int(dsc_joiner_max_bpp), limits->link.max_bpp_x16); bpp_step_x16 = intel_dp_dsc_bpp_step_x16(connector); @@ -2178,6 +2173,10 @@ static int dsc_compute_compressed_bpp(struct intel_dp *intel_dp, output_bpp = intel_dp_output_bpp(pipe_config->output_format, pipe_bpp); max_bpp_x16 = min(max_bpp_x16, fxp_q4_from_int(output_bpp) - bpp_step_x16); + drm_WARN_ON(display->drm, !is_power_of_2(bpp_step_x16)); + min_bpp_x16 = round_up(limits->link.min_bpp_x16, bpp_step_x16); + max_bpp_x16 = round_down(max_bpp_x16, bpp_step_x16); + for (bpp_x16 = max_bpp_x16; bpp_x16 >= min_bpp_x16; bpp_x16 -= bpp_step_x16) { if (!intel_dp_dsc_valid_compressed_bpp(intel_dp, bpp_x16)) continue; |