diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h index e8c495f28484977d90f8e37006f1453c6b250da4..8a317b7717f780b34a075e5177d1ec6447fbd6f7 100644 --- a/drivers/gpu/drm/amd/display/dc/dc.h +++ b/drivers/gpu/drm/amd/display/dc/dc.h @@ -1410,6 +1410,8 @@ struct dc_plane_state *dc_get_surface_for_mpcc(struct dc *dc, uint32_t dc_get_opp_for_plane(struct dc *dc, struct dc_plane_state *plane); +void dc_set_disable_128b_132b_stream_overhead(bool disable); + /* The function returns minimum bandwidth required to drive a given timing * return - minimum required timing bandwidth in kbps. */ diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c index 58dd62cce4bb9b473cb3197b8b9f7302dacde8a0..aed0d3dafa2472684a97a573e4701fd0f53a1921 100644 --- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c +++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c @@ -40,6 +40,8 @@ static bool dsc_policy_enable_dsc_when_not_needed; static bool dsc_policy_disable_dsc_stream_overhead; +static bool disable_128b_132b_stream_overhead; + #ifndef MAX #define MAX(X, Y) ((X) > (Y) ? (X) : (Y)) #endif @@ -47,6 +49,41 @@ static bool dsc_policy_disable_dsc_stream_overhead; #define MIN(X, Y) ((X) < (Y) ? (X) : (Y)) #endif +/* Need to account for padding due to pixel-to-symbol packing + * for uncompressed 128b/132b streams. + */ +static uint32_t apply_128b_132b_stream_overhead( + const struct dc_crtc_timing *timing, const uint32_t kbps) +{ + uint32_t total_kbps = kbps; + + if (disable_128b_132b_stream_overhead) + return kbps; + + if (!timing->flags.DSC) { + struct fixed31_32 bpp; + struct fixed31_32 overhead_factor; + + bpp = dc_fixpt_from_int(kbps); + bpp = dc_fixpt_div_int(bpp, timing->pix_clk_100hz / 10); + + /* Symbols_per_HActive = HActive * bpp / (4 lanes * 32-bit symbol size) + * Overhead_factor = ceil(Symbols_per_HActive) / Symbols_per_HActive + */ + overhead_factor = dc_fixpt_from_int(timing->h_addressable); + overhead_factor = dc_fixpt_mul(overhead_factor, bpp); + overhead_factor = dc_fixpt_div_int(overhead_factor, 128); + overhead_factor = dc_fixpt_div( + dc_fixpt_from_int(dc_fixpt_ceil(overhead_factor)), + overhead_factor); + + total_kbps = dc_fixpt_ceil( + dc_fixpt_mul_int(overhead_factor, total_kbps)); + } + + return total_kbps; +} + uint32_t dc_bandwidth_in_kbps_from_timing( const struct dc_crtc_timing *timing) { @@ -1165,6 +1202,11 @@ void dc_dsc_policy_set_disable_dsc_stream_overhead(bool disable) dsc_policy_disable_dsc_stream_overhead = disable; } +void dc_set_disable_128b_132b_stream_overhead(bool disable) +{ + disable_128b_132b_stream_overhead = disable; +} + void dc_dsc_get_default_config_option(const struct dc *dc, struct dc_dsc_config_options *options) { options->dsc_min_slice_height_override = dc->debug.dsc_min_slice_height_override;