Add intel_hdmi_frl_dfm_compute_config() to find the lowest FRL rate that meets the DFM requirements for a mode, and fill the crtc_state with the computed DFM parameters and Link M/N.
Signed-off-by: Ankit Nautiyal <[email protected]> Signed-off-by: Vandita Kulkarni <[email protected]> --- .../gpu/drm/i915/display/intel_hdmi_frl_dfm.c | 82 +++++++++++++++++++ .../gpu/drm/i915/display/intel_hdmi_frl_dfm.h | 3 + 2 files changed, 85 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.c b/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.c index 51a09c05bef3..36ac13b2539b 100644 --- a/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.c +++ b/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.c @@ -6,6 +6,7 @@ #include <linux/kernel.h> #include <drm/drm_connector.h> +#include <drm/drm_print.h> #include "intel_de.h" #include "intel_display_driver.h" @@ -744,3 +745,84 @@ void intel_hdmi_frl_dfm_read(struct intel_crtc_state *crtc_state) crtc_state->frl.tb_threshold_min = REG_FIELD_GET(TB_MIN_THESHOLD_MASK, val); } + +static u32 +get_drm_color_format(enum intel_output_format output_format) +{ + switch (output_format) { + case INTEL_OUTPUT_FORMAT_RGB: + return DRM_OUTPUT_COLOR_FORMAT_RGB444; + case INTEL_OUTPUT_FORMAT_YCBCR420: + return DRM_OUTPUT_COLOR_FORMAT_YCBCR420; + case INTEL_OUTPUT_FORMAT_YCBCR444: + return DRM_OUTPUT_COLOR_FORMAT_YCBCR444; + default: + return DRM_OUTPUT_COLOR_FORMAT_RGB444; + } +} + +int intel_hdmi_frl_dfm_compute_config(struct intel_encoder *encoder, + struct intel_crtc_state *crtc_state) +{ + static const int rate[] = {9, 18, 24, 32, 40, 48}; + static const int audio_freq_hz[] = {192000, 176400, 96000, 88200, 48000}; + struct intel_hdmi_frl_dfm frl_dfm = {0}; + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder); + struct intel_display *display = to_intel_display(crtc_state); + struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; + int max_rate = intel_hdmi->max_frl_rate; + bool can_support_frl_mode = false; + int i, j; + + /* Fill mode related input params */ + frl_dfm.config.pixel_clock_nominal_khz = adjusted_mode->clock; + frl_dfm.config.hactive = adjusted_mode->hdisplay; + frl_dfm.config.hblank = adjusted_mode->htotal - adjusted_mode->hdisplay; + + /* Fill color related input params */ + frl_dfm.config.bpc = crtc_state->pipe_bpp / 3; + frl_dfm.config.color_format = get_drm_color_format(crtc_state->output_format); + + /* + * Check if the resolution can be supported in FRL mode. + * We try with the lowest FRL rate first — the minimum rate that + * satisfies DFM requirements — for better SI margin and lower power. + */ + for (i = 0; i < ARRAY_SIZE(rate); i++) { + if (rate[i] > max_rate) + continue; + /* Fill the bw related input parameters */ + frl_dfm.config.lanes = rate[i] < 24 ? 3 : 4; + frl_dfm.config.bit_rate_kbps = (rate[i] * 1000000) / frl_dfm.config.lanes; + for (j = 0; j < ARRAY_SIZE(audio_freq_hz); j++) { + frl_dfm.config.audio_hz = audio_freq_hz[j]; + frl_dfm.config.audio_channels = 8; + + if (intel_hdmi_frl_dfm_nondsc_requirement_met(&frl_dfm)) { + can_support_frl_mode = true; + break; + } + } + + if (can_support_frl_mode) + break; + } + + if (!can_support_frl_mode) + return -EINVAL; + + /* Fill crtc_state frl DFM output params */ + crtc_state->frl.required_lanes = frl_dfm.config.lanes; + crtc_state->frl.required_rate = frl_dfm.config.bit_rate_kbps / 1000000; + crtc_state->frl.tb_borrowed = frl_dfm.params.tb_borrowed; + crtc_state->frl.tb_actual = frl_dfm.params.tb_borrowed / 2; + drm_dbg_kms(display->drm, "FRL DFM config: tb_borrowed = %d, tb_actual = %d\n", + crtc_state->frl.tb_borrowed, crtc_state->frl.tb_actual); + + if (frl_dfm.params.tb_borrowed && (frl_dfm.params.tb_borrowed / 2) <= 492) + crtc_state->frl.tb_threshold_min = 492 - (frl_dfm.params.tb_borrowed / 2); + else + crtc_state->frl.tb_threshold_min = 492; + + return 0; +} diff --git a/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.h b/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.h index 1bfc70067518..eedf43e2836c 100644 --- a/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.h +++ b/drivers/gpu/drm/i915/display/intel_hdmi_frl_dfm.h @@ -8,6 +8,7 @@ #include <linux/types.h> struct intel_crtc_state; +struct intel_encoder; /* All the input config needed to compute DFM requirements */ struct intel_hdmi_frl_dfm_input_config { @@ -119,5 +120,7 @@ intel_hdmi_frl_dfm_dsc_requirement_met(struct intel_hdmi_frl_dfm *frl_dfm); void intel_hdmi_frl_dfm_write(const struct intel_crtc_state *crtc_state); void intel_hdmi_frl_dfm_read(struct intel_crtc_state *crtc_state); +int intel_hdmi_frl_dfm_compute_config(struct intel_encoder *encoder, + struct intel_crtc_state *crtc_state); #endif -- 2.50.1
