Add helpers to compute DFM variables and to verify if the DFM requirements are met or not in non dsc cases.
Signed-off-by: Vandita Kulkarni vandita.kulkarni@intel.com --- drivers/gpu/drm/drm_frl_dfm_helper.c | 161 +++++++++++++++++++++++++++ include/drm/drm_frl_dfm_helper.h | 2 + 2 files changed, 163 insertions(+)
diff --git a/drivers/gpu/drm/drm_frl_dfm_helper.c b/drivers/gpu/drm/drm_frl_dfm_helper.c index 8498083adf72..087905ed630a 100644 --- a/drivers/gpu/drm/drm_frl_dfm_helper.c +++ b/drivers/gpu/drm/drm_frl_dfm_helper.c @@ -394,3 +394,164 @@ drm_compute_payload_utilization(u32 frl_char_payload_actual, u32 frl_char_per_li utilization = (frl_char_payload_actual * EFFICIENCY_MULTIPLIER) / frl_char_per_line_period; return utilization; } + +/* Collect link characteristics */ +static void +drm_frl_dfm_compute_link_characteristics(struct drm_hdmi_frl_dfm *frl_dfm) +{ + u32 frl_bit_rate_min_kbps; + + frl_dfm->params.pixel_clock_max_khz = + drm_get_max_legal_pixel_rate(frl_dfm->config.pixel_clock_nominal_khz); + frl_dfm->params.line_time_ns = + drm_get_min_video_line_period(frl_dfm->config.hblank, + frl_dfm->config.hactive, + frl_dfm->params.pixel_clock_max_khz); + frl_bit_rate_min_kbps = drm_get_min_frl_bit_rate(frl_dfm->config.bit_rate_kbps); + frl_dfm->params.char_rate_min_kbps = drm_get_min_frl_char_rate(frl_bit_rate_min_kbps); + frl_dfm->params.cfrl_line = + drm_get_total_frl_char_per_line_period(frl_dfm->params.line_time_ns, + frl_dfm->params.char_rate_min_kbps, + frl_dfm->config.lanes); +} + +/* Determine FRL link overhead */ +static void drm_frl_dfm_compute_max_frl_link_overhead(struct drm_hdmi_frl_dfm *frl_dfm) +{ + u32 overhead_min; + + overhead_min = drm_get_total_minimum_overhead(frl_dfm->config.lanes); + frl_dfm->params.overhead_max = drm_get_max_overhead(overhead_min); +} + +/* Audio support Verification computations */ +static void +drm_frl_dfm_compute_audio_hblank_min(struct drm_hdmi_frl_dfm *frl_dfm) +{ + u32 num_audio_pkt, audio_pkt_rate; + + /* + * TBD: get the actual audio pkt type as described in + * table 6.44 of HDMI2.1 spec to find the num_audio_pkt, + * for now assume audio sample packet and audio packet + * layout as 1, resulting in number of audio packets + * required to carry each audio sample or audio frame + * as 1 + */ + num_audio_pkt = 1; + audio_pkt_rate = drm_get_audio_pkt_rate(frl_dfm->config.audio_hz, num_audio_pkt); + frl_dfm->params.num_audio_pkts_line = + drm_get_audio_pkts_hblank(audio_pkt_rate, frl_dfm->params.line_time_ns); + frl_dfm->params.hblank_audio_min = + drm_get_audio_hblank_min(frl_dfm->params.num_audio_pkts_line); +} + +/* + * Determine the number of tribytes required for active video , blanking period + * with the pixel configuration + */ +static void +drm_frl_dfm_compute_tbactive_tbblank(struct drm_hdmi_frl_dfm *frl_dfm) +{ + u32 bpp, bytes_per_line; + + bpp = drm_get_frl_bits_per_pixel(frl_dfm->config.color_format, frl_dfm->config.bpc); + bytes_per_line = drm_get_video_bytes_per_line(bpp, frl_dfm->config.hactive); + + frl_dfm->params.tb_active = drm_get_active_video_tribytes_reqd(bytes_per_line); + frl_dfm->params.tb_blank = + drm_get_blanking_tribytes_avail(frl_dfm->config.color_format, + frl_dfm->config.hblank, + frl_dfm->config.bpc); +} + +/* Verify the configuration meets the capacity requirements for the FRL configuration*/ +static bool +drm_frl_dfm_verify_frl_capacity_requirement(struct drm_hdmi_frl_dfm *frl_dfm) +{ + u32 tactive_ref_ns, tblank_ref_ns, tactive_min_ns, tblank_min_ns; + u32 tborrowed_ns; + + frl_dfm->params.ftb_avg_k = + drm_get_avg_tribyte_rate(frl_dfm->params.pixel_clock_max_khz, + frl_dfm->params.tb_active, frl_dfm->params.tb_blank, + frl_dfm->config.hactive, frl_dfm->config.hblank); + tactive_ref_ns = drm_get_tactive_ref(frl_dfm->params.line_time_ns, + frl_dfm->config.hblank, + frl_dfm->config.hactive); + tblank_ref_ns = drm_get_tblank_ref(frl_dfm->params.line_time_ns, + frl_dfm->config.hblank, + frl_dfm->config.hactive); + tactive_min_ns = drm_get_tactive_min(frl_dfm->config.lanes, + frl_dfm->params.tb_active, + frl_dfm->params.overhead_max, + frl_dfm->params.char_rate_min_kbps); + tblank_min_ns = drm_get_tblank_min(frl_dfm->config.lanes, + frl_dfm->params.tb_blank, + frl_dfm->params.overhead_max, + frl_dfm->params.char_rate_min_kbps); + + if ((tactive_ref_ns >= tactive_min_ns) && + (tblank_ref_ns >= tblank_min_ns)) { + tborrowed_ns = 0; + frl_dfm->params.tb_borrowed = 0; + return true; + } + + if ((tactive_ref_ns < tactive_min_ns) && + (tblank_ref_ns >= tblank_min_ns)) { + tborrowed_ns = tactive_min_ns - tactive_ref_ns; + frl_dfm->params.tb_borrowed = drm_get_tribytes_borrowed(tborrowed_ns, + frl_dfm->params.ftb_avg_k); + if (frl_dfm->params.tb_borrowed <= TB_BORROWED_MAX) + return true; + } + + return false; +} + +/* Verify utilization does not exceed capacity */ +static bool +drm_frl_dfm_verify_utilization_possible(struct drm_hdmi_frl_dfm *frl_dfm) +{ + u32 cfrl_free, cfrl_savings, frl_char_payload_actual; + u32 utilization, margin; + + cfrl_free = drm_get_num_char_rc_compressible(frl_dfm->config.color_format, + frl_dfm->config.bpc, + frl_dfm->params.num_audio_pkts_line, + frl_dfm->config.hblank); + cfrl_savings = drm_get_num_char_compression_savings(cfrl_free); + frl_char_payload_actual = drm_get_frl_char_payload_actual(frl_dfm->params.tb_active, + frl_dfm->params.tb_blank, + cfrl_savings); + utilization = drm_compute_payload_utilization(frl_char_payload_actual, + frl_dfm->params.cfrl_line); + + margin = 1000 - (utilization + frl_dfm->params.overhead_max); + + if (margin > 0) + return true; + + return false; +} + +/* Check if DFM requirement is met */ +bool +drm_frl_dfm_nondsc_requirement_met(struct drm_hdmi_frl_dfm *frl_dfm) +{ + bool frl_capacity_req_met; + + drm_frl_dfm_compute_max_frl_link_overhead(frl_dfm); + drm_frl_dfm_compute_link_characteristics(frl_dfm); + drm_frl_dfm_compute_audio_hblank_min(frl_dfm); + drm_frl_dfm_compute_tbactive_tbblank(frl_dfm); + + frl_capacity_req_met = drm_frl_dfm_verify_frl_capacity_requirement(frl_dfm); + + if (frl_capacity_req_met) + return drm_frl_dfm_verify_utilization_possible(frl_dfm); + + return false; +} +EXPORT_SYMBOL(drm_frl_dfm_nondsc_requirement_met); diff --git a/include/drm/drm_frl_dfm_helper.h b/include/drm/drm_frl_dfm_helper.h index 16b8fcc7cbcc..f36b6898e9dd 100644 --- a/include/drm/drm_frl_dfm_helper.h +++ b/include/drm/drm_frl_dfm_helper.h @@ -123,4 +123,6 @@ struct drm_hdmi_frl_dfm { struct drm_frl_dfm_params params; };
+bool drm_frl_dfm_nondsc_requirement_met(struct drm_hdmi_frl_dfm *frl_dfm); + #endif