diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_bios.c | 99 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_bios.h | 5 |
2 files changed, 104 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index 726516ae17ba..bd674fd355b7 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -29,6 +29,7 @@ #include <drm/i915_drm.h> #include "display/intel_display.h" +#include "display/intel_display_types.h" #include "display/intel_gmbus.h" #include "i915_drv.h" @@ -2394,6 +2395,104 @@ bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, return false; } +static void fill_dsc(struct intel_crtc_state *crtc_state, + struct dsc_compression_parameters_entry *dsc, + int dsc_max_bpc) +{ + struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config; + int bpc = 8; + + vdsc_cfg->dsc_version_major = dsc->version_major; + vdsc_cfg->dsc_version_minor = dsc->version_minor; + + if (dsc->support_12bpc && dsc_max_bpc >= 12) + bpc = 12; + else if (dsc->support_10bpc && dsc_max_bpc >= 10) + bpc = 10; + else if (dsc->support_8bpc && dsc_max_bpc >= 8) + bpc = 8; + else + DRM_DEBUG_KMS("VBT: Unsupported BPC %d for DCS\n", + dsc_max_bpc); + + crtc_state->pipe_bpp = bpc * 3; + + crtc_state->dsc.compressed_bpp = min(crtc_state->pipe_bpp, + VBT_DSC_MAX_BPP(dsc->max_bpp)); + + /* + * FIXME: This is ugly, and slice count should take DSC engine + * throughput etc. into account. + * + * Also, per spec DSI supports 1, 2, 3 or 4 horizontal slices. + */ + if (dsc->slices_per_line & BIT(2)) { + crtc_state->dsc.slice_count = 4; + } else if (dsc->slices_per_line & BIT(1)) { + crtc_state->dsc.slice_count = 2; + } else { + /* FIXME */ + if (!(dsc->slices_per_line & BIT(0))) + DRM_DEBUG_KMS("VBT: Unsupported DSC slice count for DSI\n"); + + crtc_state->dsc.slice_count = 1; + } + + if (crtc_state->hw.adjusted_mode.crtc_hdisplay % + crtc_state->dsc.slice_count != 0) + DRM_DEBUG_KMS("VBT: DSC hdisplay %d not divisible by slice count %d\n", + crtc_state->hw.adjusted_mode.crtc_hdisplay, + crtc_state->dsc.slice_count); + + /* + * FIXME: Use VBT rc_buffer_block_size and rc_buffer_size for the + * implementation specific physical rate buffer size. Currently we use + * the required rate buffer model size calculated in + * drm_dsc_compute_rc_parameters() according to VESA DSC Annex E. + * + * The VBT rc_buffer_block_size and rc_buffer_size definitions + * correspond to DP 1.4 DPCD offsets 0x62 and 0x63. The DP DSC + * implementation should also use the DPCD (or perhaps VBT for eDP) + * provided value for the buffer size. + */ + + /* FIXME: DSI spec says bpc + 1 for this one */ + vdsc_cfg->line_buf_depth = VBT_DSC_LINE_BUFFER_DEPTH(dsc->line_buffer_depth); + + vdsc_cfg->block_pred_enable = dsc->block_prediction_enable; + + vdsc_cfg->slice_height = dsc->slice_height; +} + +/* FIXME: initially DSI specific */ +bool intel_bios_get_dsc_params(struct intel_encoder *encoder, + struct intel_crtc_state *crtc_state, + int dsc_max_bpc) +{ + struct drm_i915_private *i915 = to_i915(encoder->base.dev); + const struct display_device_data *devdata; + const struct child_device_config *child; + + list_for_each_entry(devdata, &i915->vbt.display_devices, node) { + child = &devdata->child; + + if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT)) + continue; + + if (child->dvo_port - DVO_PORT_MIPIA == encoder->port) { + if (!devdata->dsc) + return false; + + if (crtc_state) + fill_dsc(crtc_state, devdata->dsc, dsc_max_bpc); + + return true; + } + } + + return false; +} + /** * intel_bios_is_port_hpd_inverted - is HPD inverted for %port * @i915: i915 device instance diff --git a/drivers/gpu/drm/i915/display/intel_bios.h b/drivers/gpu/drm/i915/display/intel_bios.h index 98f064828a57..d6a0c29d37ac 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.h +++ b/drivers/gpu/drm/i915/display/intel_bios.h @@ -35,6 +35,8 @@ #include <drm/i915_drm.h> struct drm_i915_private; +struct intel_crtc_state; +struct intel_encoder; enum port; enum intel_backlight_type { @@ -242,5 +244,8 @@ bool intel_bios_is_port_hpd_inverted(const struct drm_i915_private *i915, bool intel_bios_is_lspcon_present(const struct drm_i915_private *i915, enum port port); enum aux_ch intel_bios_port_aux_ch(struct drm_i915_private *dev_priv, enum port port); +bool intel_bios_get_dsc_params(struct intel_encoder *encoder, + struct intel_crtc_state *crtc_state, + int dsc_max_bpc); #endif /* _INTEL_BIOS_H_ */ |