@@ -1993,6 +1993,9 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
const struct link_config_limits *limits)
{
struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
+ struct intel_connector *connector = intel_dp->attached_connector;
+ const struct drm_display_info *info = &connector->base.display_info;
+ struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp);
int bpp, clock, lane_count;
int mode_rate, link_clock, link_avail;
@@ -2002,6 +2005,21 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
output_bpp);
+ /*
+ * Bypass this mode if require bandwidth over downstream
+ * limitation or HDMI spec when LSPCON active.
+ */
+ if (lspcon->active) {
+ int max_clock_rate = lspcon_max_rate(lspcon);
+
+ if (info->max_tmds_clock)
+ max_clock_rate = min(max_clock_rate,
+ DIV_ROUND_UP(info->max_tmds_clock * 24, 8));
+
+ if (mode_rate > max_clock_rate)
+ continue;
+ }
+
for (clock = limits->min_clock; clock <= limits->max_clock; clock++) {
for (lane_count = limits->min_lane_count;
lane_count <= limits->max_lane_count;
@@ -518,6 +518,16 @@ void lspcon_set_infoframes(struct intel_encoder *encoder,
buf, ret);
}
+int lspcon_max_rate(struct intel_lspcon *lspcon)
+{
+ enum drm_lspcon_mode current_mode = lspcon_get_current_mode(lspcon);
+
+ if (current_mode == DRM_LSPCON_MODE_LS)
+ return DIV_ROUND_UP(340000 * 24, 8);
+
+ return DIV_ROUND_UP(600000 * 24, 8);
+}
+
u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config)
{
@@ -18,6 +18,7 @@ struct intel_lspcon;
bool lspcon_init(struct intel_digital_port *intel_dig_port);
void lspcon_resume(struct intel_lspcon *lspcon);
void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon);
+int lspcon_max_rate(struct intel_lspcon *lspcon);
void lspcon_write_infoframe(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
unsigned int type,
While mode setting, driver would calculate mode rate based on resolution and bpp. And choose the best bpp that did not exceed DP bandwidtd. But LSPCON had more restriction due to it convert DP to HDMI. Driver should respect HDMI's bandwidth limitation if LSPCON was active. This change would ignore the bpp when its required output bandwidth already over HDMI 2.0 or 1.4 spec. v2: convert info->max_tmds_clock to byte clock for comparison. Cc: Imre Deak <imre.deak@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Cooper Chiou <cooper.chiou@intel.com> Cc: Sam McNally <sammc@google.com> Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com> --- drivers/gpu/drm/i915/display/intel_dp.c | 18 ++++++++++++++++++ drivers/gpu/drm/i915/display/intel_lspcon.c | 10 ++++++++++ drivers/gpu/drm/i915/display/intel_lspcon.h | 1 + 3 files changed, 29 insertions(+)