/** * DOC: Panel Self Refresh (PSR/SRD) * * Since Haswell Display controller supports Panel Self-Refresh on display * panels witch have a remote frame buffer (RFB) implemented according to PSR * spec in eDP1.3. PSR feature allows the display to go to lower standby states * when system is idle but display is on as it eliminates display refresh * request to DDR memory completely as long as the frame buffer for that * display is unchanged. * * Panel Self Refresh must be supported by both Hardware (source) and * Panel (sink). * * PSR saves power by caching the framebuffer in the panel RFB, which allows us * to power down the link and memory controller. For DSI panels the same idea * is called "manual mode". * * The implementation uses the hardware-based PSR support which automatically * enters/exits self-refresh mode. The hardware takes care of sending the * required DP aux message and could even retrain the link (that part isn't * enabled yet though). The hardware also keeps track of any frontbuffer * changes to know when to exit self-refresh mode again. Unfortunately that * part doesn't work too well, hence why the i915 PSR support uses the * software frontbuffer tracking to make sure it doesn't miss a screen * update. For this integration intel_psr_invalidate() and intel_psr_flush() * get called by the frontbuffer tracking code. Note that because of locking * issues the self-refresh re-enable code is done from a work queue, which * must be correctly synchronized/cancelled when shutting down the pipe." * * DC3CO (DC3 clock off) * * On top of PSR2, GEN12 adds a intermediate power savings state that turns * clock off automatically during PSR2 idle state. * The smaller overhead of DC3co entry/exit vs. the overhead of PSR2 deep sleep * entry/exit allows the HW to enter a low-power state even when page flipping * periodically (for instance a 30fps video playback scenario). * * Every time a flips occurs PSR2 will get out of deep sleep state(if it was), * so DC3CO is enabled and tgl_dc3co_disable_work is schedule to run after 6 * frames, if no other flip occurs and the function above is executed, DC3CO is * disabled and PSR2 is configured to enter deep sleep, resetting again in case * of another flip. * Front buffer modifications do not trigger DC3CO activation on purpose as it * would bring a lot of complexity and most of the moderns systems will only * use page flips.
*/
/* * Description of PSR mask bits: * * EDP_PSR_DEBUG[16]/EDP_PSR_DEBUG_MASK_DISP_REG_WRITE (hsw-skl): * * When unmasked (nearly) all display register writes (eg. even * SWF) trigger a PSR exit. Some registers are excluded from this * and they have a more specific mask (described below). On icl+ * this bit no longer exists and is effectively always set. * * PIPE_MISC[21]/PIPE_MISC_PSR_MASK_PIPE_REG_WRITE (skl+): * * When unmasked (nearly) all pipe/plane register writes * trigger a PSR exit. Some plane registers are excluded from this * and they have a more specific mask (described below). * * CHICKEN_PIPESL_1[11]/SKL_PSR_MASK_PLANE_FLIP (skl+): * PIPE_MISC[23]/PIPE_MISC_PSR_MASK_PRIMARY_FLIP (bdw): * EDP_PSR_DEBUG[23]/EDP_PSR_DEBUG_MASK_PRIMARY_FLIP (hsw): * * When unmasked PRI_SURF/PLANE_SURF writes trigger a PSR exit. * SPR_SURF/CURBASE are not included in this and instead are * controlled by PIPE_MISC_PSR_MASK_PIPE_REG_WRITE (skl+) or * EDP_PSR_DEBUG_MASK_DISP_REG_WRITE (hsw/bdw). * * PIPE_MISC[22]/PIPE_MISC_PSR_MASK_SPRITE_ENABLE (bdw): * EDP_PSR_DEBUG[21]/EDP_PSR_DEBUG_MASK_SPRITE_ENABLE (hsw): * * When unmasked PSR is blocked as long as the sprite * plane is enabled. skl+ with their universal planes no * longer have a mask bit like this, and no plane being * enabledb blocks PSR. * * PIPE_MISC[21]/PIPE_MISC_PSR_MASK_CURSOR_MOVE (bdw): * EDP_PSR_DEBUG[20]/EDP_PSR_DEBUG_MASK_CURSOR_MOVE (hsw): * * When umasked CURPOS writes trigger a PSR exit. On skl+ * this doesn't exit but CURPOS is included in the * PIPE_MISC_PSR_MASK_PIPE_REG_WRITE mask. * * PIPE_MISC[20]/PIPE_MISC_PSR_MASK_VBLANK_VSYNC_INT (bdw+): * EDP_PSR_DEBUG[19]/EDP_PSR_DEBUG_MASK_VBLANK_VSYNC_INT (hsw): * * When unmasked PSR is blocked as long as vblank and/or vsync * interrupt is unmasked in IMR *and* enabled in IER. * * CHICKEN_TRANS[30]/SKL_UNMASK_VBL_TO_PIPE_IN_SRD (skl+): * CHICKEN_PAR1_1[15]/HSW_MASK_VBL_TO_PIPE_IN_SRD (hsw/bdw): * * Selectcs whether PSR exit generates an extra vblank before * the first frame is transmitted. Also note the opposite polarity * if the bit on hsw/bdw vs. skl+ (masked==generate the extra vblank, * unmasked==do not generate the extra vblank). * * With DC states enabled the extra vblank happens after link training, * with DC states disabled it happens immediately upuon PSR exit trigger. * No idea as of now why there is a difference. HSW/BDW (which don't * even have DMC) always generate it after link training. Go figure. * * Unfortunately CHICKEN_TRANS itself seems to be double buffered * and thus won't latch until the first vblank. So with DC states * enabled the register effectively uses the reset value during DC5 * exit+PSR exit sequence, and thus the bit does nothing until * latched by the vblank that it was trying to prevent from being * generated in the first place. So we should probably call this * one a chicken/egg bit instead on skl+. * * In standby mode (as opposed to link-off) this makes no difference * as the timing generator keeps running the whole time generating * normal periodic vblanks. * * WaPsrDPAMaskVBlankInSRD asks us to set the bit on hsw/bdw, * and doing so makes the behaviour match the skl+ reset value. * * CHICKEN_PIPESL_1[0]/BDW_UNMASK_VBL_TO_REGS_IN_SRD (bdw): * CHICKEN_PIPESL_1[15]/HSW_UNMASK_VBL_TO_REGS_IN_SRD (hsw): * * On BDW without this bit is no vblanks whatsoever are * generated after PSR exit. On HSW this has no apparent effect. * WaPsrDPRSUnmaskVBlankInSRD says to set this. * * The rest of the bits are more self-explanatory and/or * irrelevant for normal operation. * * Description of intel_crtc_state variables. has_psr, has_panel_replay and * has_sel_update: * * has_psr (alone): PSR1 * has_psr + has_sel_update: PSR2 * has_psr + has_panel_replay: Panel Replay * has_psr + has_panel_replay + has_sel_update: Panel Replay Selective Update * * Description of some intel_psr variables. enabled, panel_replay_enabled, * sel_update_enabled * * enabled (alone): PSR1 * enabled + sel_update_enabled: PSR2 * enabled + panel_replay_enabled: Panel Replay * enabled + panel_replay_enabled + sel_update_enabled: Panel Replay SU
*/
bool intel_psr_needs_aux_io_power(struct intel_encoder *encoder, conststruct intel_crtc_state *crtc_state)
{ /* * For PSR/PR modes only eDP requires the AUX IO power to be enabled whenever * the output is enabled. For non-eDP outputs the main link is always * on, hence it doesn't require the HW initiated AUX wake-up signaling used * for eDP. * * TODO: * - Consider leaving AUX IO disabled for eDP / PR as well, in case * the ALPM with main-link off mode is not enabled. * - Leave AUX IO enabled for DP / PR, once support for ALPM with * main-link off mode is added for it and this mode gets enabled.
*/ return intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP) &&
intel_encoder_can_psr(encoder);
}
if (psr_iir & psr_irq_psr_error_bit_get(intel_dp)) {
drm_warn(display->drm, "[transcoder %s] PSR aux error\n",
transcoder_name(cpu_transcoder));
intel_dp->psr.irq_aux_error = true;
/* * If this interruption is not masked it will keep * interrupting so fast that it prevents the scheduled * work to run. * Also after a PSR error, we don't want to arm PSR * again so we don't care about unmask the interruption * or unset irq_aux_error.
*/
intel_de_rmw(display, psr_imr_reg(display, cpu_transcoder),
0, psr_irq_psr_error_bit_get(intel_dp));
static u8 intel_dp_get_sink_sync_latency(struct intel_dp *intel_dp)
{ struct intel_display *display = to_intel_display(intel_dp);
u8 val = 8; /* assume the worst if we can't read the value */
if (drm_dp_dpcd_readb(&intel_dp->aux,
DP_SYNCHRONIZATION_LATENCY_IN_SINK, &val) == 1)
val &= DP_MAX_RESYNC_FRAME_COUNT_MASK; else
drm_dbg_kms(display->drm, "Unable to get sink synchronization latency, assuming 8 frames\n"); return val;
}
/* * Note: Bits related to granularity are same in panel replay and psr * registers. Rely on PSR definitions on these "common" bits.
*/ staticvoid intel_dp_get_su_granularity(struct intel_dp *intel_dp)
{ struct intel_display *display = to_intel_display(intel_dp);
ssize_t r;
u16 w;
u8 y;
/* * TODO: Do we need to take into account panel supporting both PSR and * Panel replay?
*/
/* * If sink don't have specific granularity requirements set legacy * ones.
*/ if (!(intel_dp_get_su_capability(intel_dp) &
DP_PSR2_SU_GRANULARITY_REQUIRED)) { /* As PSR2 HW sends full lines, we do not care about x granularity */
w = 4;
y = 4; gotoexit;
}
r = drm_dp_dpcd_read(&intel_dp->aux,
intel_dp_get_su_x_granularity_offset(intel_dp),
&w, 2); if (r != 2)
drm_dbg_kms(display->drm, "Unable to read selective update x granularity\n"); /* * Spec says that if the value read is 0 the default granularity should * be used instead.
*/ if (r != 2 || w == 0)
w = 4;
r = drm_dp_dpcd_read(&intel_dp->aux,
intel_dp_get_su_y_granularity_offset(intel_dp),
&y, 1); if (r != 1) {
drm_dbg_kms(display->drm, "Unable to read selective update y granularity\n");
y = 4;
} if (y == 0)
y = 1;
if (intel_dp_is_edp(intel_dp)) { if (!intel_alpm_aux_less_wake_supported(intel_dp)) {
drm_dbg_kms(display->drm, "Panel doesn't support AUX-less ALPM, eDP Panel Replay not possible\n"); return;
}
if (!(intel_dp->pr_dpcd[INTEL_PR_DPCD_INDEX(DP_PANEL_REPLAY_CAP_SUPPORT)] &
DP_PANEL_REPLAY_EARLY_TRANSPORT_SUPPORT)) {
drm_dbg_kms(display->drm, "Panel doesn't support early transport, eDP Panel Replay not possible\n"); return;
}
}
intel_dp->psr.sink_panel_replay_support = true;
if (intel_dp->pr_dpcd[INTEL_PR_DPCD_INDEX(DP_PANEL_REPLAY_CAP_SUPPORT)] &
DP_PANEL_REPLAY_SU_SUPPORT)
intel_dp->psr.sink_panel_replay_su_support = true;
drm_dbg_kms(display->drm, "eDP panel supports PSR version %x\n",
intel_dp->psr_dpcd[0]);
if (drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_NO_PSR)) {
drm_dbg_kms(display->drm, "PSR support not currently available for this panel\n"); return;
}
if (!(intel_dp->edp_dpcd[1] & DP_EDP_SET_POWER_CAP)) {
drm_dbg_kms(display->drm, "Panel lacks power state control, PSR cannot be enabled\n"); return;
}
/* * All panels that supports PSR version 03h (PSR2 + * Y-coordinate) can handle Y-coordinates in VSC but we are * only sure that it is going to be used when required by the * panel. This way panel is capable to do selective update * without a aux frame sync. * * To support PSR version 02h and PSR version 03h without * Y-coordinate requirement panels we would need to enable * GTC first.
*/
intel_dp->psr.sink_psr2_support = y_req &&
intel_alpm_aux_wake_supported(intel_dp);
drm_dbg_kms(display->drm, "PSR2 %ssupported\n",
intel_dp->psr.sink_psr2_support ? "" : "not ");
}
}
BUILD_BUG_ON(sizeof(aux_msg) > 20); for (i = 0; i < sizeof(aux_msg); i += 4)
intel_de_write(display,
psr_aux_data_reg(display, cpu_transcoder, i >> 2),
intel_dp_aux_pack(&aux_msg[i], sizeof(aux_msg) - i));
if (crtc_state->has_sel_update) {
val |= DP_PSR_ENABLE_PSR2 | DP_PSR_IRQ_HPD_WITH_CRC_ERRORS;
} else { if (intel_dp->psr.link_standby)
val |= DP_PSR_MAIN_LINK_ACTIVE;
if (DISPLAY_VER(display) >= 8)
val |= DP_PSR_CRC_VERIFICATION;
}
if (crtc_state->req_psr2_sdp_prior_scanline)
val |= DP_PSR_SU_REGION_SCANLINE_CAPTURE;
if (crtc_state->enable_psr2_su_region_et)
val |= DP_PANEL_REPLAY_ENABLE_SU_REGION_ET;
if (intel_dp->psr.entry_setup_frames > 0)
val |= DP_PSR_FRAME_CAPTURE;
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, val);
val |= DP_PSR_ENABLE;
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, val);
}
if (DISPLAY_VER(display) >= 11)
val |= EDP_PSR_TP4_TIME_0us;
if (display->params.psr_safest_params) {
val |= EDP_PSR_TP1_TIME_2500us;
val |= EDP_PSR_TP2_TP3_TIME_2500us; goto check_tp3_sel;
}
if (connector->panel.vbt.psr.tp1_wakeup_time_us == 0)
val |= EDP_PSR_TP1_TIME_0us; elseif (connector->panel.vbt.psr.tp1_wakeup_time_us <= 100)
val |= EDP_PSR_TP1_TIME_100us; elseif (connector->panel.vbt.psr.tp1_wakeup_time_us <= 500)
val |= EDP_PSR_TP1_TIME_500us; else
val |= EDP_PSR_TP1_TIME_2500us;
if (connector->panel.vbt.psr.tp2_tp3_wakeup_time_us == 0)
val |= EDP_PSR_TP2_TP3_TIME_0us; elseif (connector->panel.vbt.psr.tp2_tp3_wakeup_time_us <= 100)
val |= EDP_PSR_TP2_TP3_TIME_100us; elseif (connector->panel.vbt.psr.tp2_tp3_wakeup_time_us <= 500)
val |= EDP_PSR_TP2_TP3_TIME_500us; else
val |= EDP_PSR_TP2_TP3_TIME_2500us;
/* * WA 0479: hsw,bdw * "Do not skip both TP1 and TP2/TP3"
*/ if (DISPLAY_VER(display) < 9 &&
connector->panel.vbt.psr.tp1_wakeup_time_us == 0 &&
connector->panel.vbt.psr.tp2_tp3_wakeup_time_us == 0)
val |= EDP_PSR_TP2_TP3_TIME_100us;
check_tp3_sel: if (intel_dp_source_supports_tps3(display) &&
drm_dp_tps3_supported(intel_dp->dpcd))
val |= EDP_PSR_TP_TP1_TP3; else
val |= EDP_PSR_TP_TP1_TP2;
/* Let's use 6 as the minimum to cover all known cases including the * off-by-one issue that HW has in some cases.
*/
idle_frames = max(6, connector->panel.vbt.psr.idle_frames);
idle_frames = max(idle_frames, intel_dp->psr.sink_sync_latency + 1);
if (drm_WARN_ON(display->drm, idle_frames > 0xf))
idle_frames = 0xf;
/* Entry setup frames must be at least 1 less than frames before SU entry */ if (intel_dp->psr.entry_setup_frames >= frames_before_su_entry)
frames_before_su_entry = intel_dp->psr.entry_setup_frames + 1;
if (intel_dp->psr.su_region_et_enabled)
val |= LNL_EDP_PSR2_SU_REGION_ET_ENABLE;
/* * PSR2 HW is incorrectly using EDP_PSR_TP1_TP3_SEL and BSpec is * recommending keep this bit unset while PSR2 is enabled.
*/
intel_de_write(display, psr_ctl_reg(display, cpu_transcoder), psr_val);
/* * FIXME: Due to the changed sequence of activating/deactivating DC3CO, * disable DC3CO until the changed dc3co activating/deactivating sequence * is applied. B.Specs:49196
*/ return;
/* * DMC's DC3CO exit mechanism has an issue with Selective Fecth * TODO: when the issue is addressed, this restriction should be removed.
*/ if (crtc_state->enable_psr2_sel_fetch) return;
if (!(power_domains->allowed_dc_mask & DC_STATE_EN_DC3CO)) return;
if (!dc3co_is_pipe_port_compatible(intel_dp, crtc_state)) return;
/* Wa_16011303918:adl-p */ if (display->platform.alderlake_p && IS_DISPLAY_STEP(display, STEP_A0, STEP_B0)) return;
/* * DC3CO Exit time 200us B.Spec 49196 * PSR2 transcoder Early Exit scanlines = ROUNDUP(200 / line time) + 1
*/
exit_scanlines =
intel_usecs_to_scanlines(&crtc_state->uapi.adjusted_mode, 200) + 1;
if (drm_WARN_ON(display->drm, exit_scanlines > crtc_vdisplay)) return;
if (!display->params.enable_psr2_sel_fetch &&
intel_dp->psr.debug != I915_PSR_DEBUG_ENABLE_SEL_FETCH) {
drm_dbg_kms(display->drm, "PSR2 sel fetch not enabled, disabled by parameter\n"); returnfalse;
}
if (crtc_state->uapi.async_flip) {
drm_dbg_kms(display->drm, "PSR2 sel fetch not enabled, async flip enabled\n"); returnfalse;
}
/* PSR2 HW only send full lines so we only need to validate the width */ if (crtc_hdisplay % intel_dp->psr.su_w_granularity) returnfalse;
if (crtc_vdisplay % intel_dp->psr.su_y_granularity) returnfalse;
/* HW tracking is only aligned to 4 lines */ if (!crtc_state->enable_psr2_sel_fetch) return intel_dp->psr.su_y_granularity == 4;
/* * adl_p and mtl platforms have 1 line granularity. * For other platforms with SW tracking we can adjust the y coordinates * to match sink requirement if multiple of 4.
*/ if (display->platform.alderlake_p || DISPLAY_VER(display) >= 14)
y_granularity = intel_dp->psr.su_y_granularity; elseif (intel_dp->psr.su_y_granularity <= 2)
y_granularity = 4; elseif ((intel_dp->psr.su_y_granularity % 4) == 0)
y_granularity = intel_dp->psr.su_y_granularity;
if (y_granularity == 0 || crtc_vdisplay % y_granularity) returnfalse;
if (crtc_state->dsc.compression_enable &&
vdsc_cfg->slice_height % y_granularity) returnfalse;
if (!intel_alpm_compute_params(intel_dp, crtc_state)) {
drm_dbg_kms(display->drm, "PSR2/Panel Replay not enabled, Unable to use long enough wake times\n"); returnfalse;
}
if (!wake_lines_fit_into_vblank(intel_dp, crtc_state, aux_less)) {
drm_dbg_kms(display->drm, "PSR2/Panel Replay not enabled, too short vblank time\n"); returnfalse;
}
if (!intel_dp->psr.sink_psr2_support) returnfalse;
/* JSL and EHL only supports eDP 1.3 */ if (display->platform.jasperlake || display->platform.elkhartlake) {
drm_dbg_kms(display->drm, "PSR2 not supported by phy\n"); returnfalse;
}
/* Wa_16011181250 */ if (display->platform.rocketlake || display->platform.alderlake_s ||
display->platform.dg2) {
drm_dbg_kms(display->drm, "PSR2 is defeatured for this platform\n"); returnfalse;
}
if (display->platform.alderlake_p && IS_DISPLAY_STEP(display, STEP_A0, STEP_B0)) {
drm_dbg_kms(display->drm, "PSR2 not completely functional in this stepping\n"); returnfalse;
}
if (!transcoder_has_psr2(display, crtc_state->cpu_transcoder)) {
drm_dbg_kms(display->drm, "PSR2 not supported in transcoder %s\n",
transcoder_name(crtc_state->cpu_transcoder)); returnfalse;
}
/* * DSC and PSR2 cannot be enabled simultaneously. If a requested * resolution requires DSC to be enabled, priority is given to DSC * over PSR2.
*/ if (crtc_state->dsc.compression_enable &&
(DISPLAY_VER(display) < 14 && !display->platform.alderlake_p)) {
drm_dbg_kms(display->drm, "PSR2 cannot be enabled since DSC is enabled\n"); returnfalse;
}
if (HAS_PSR2_SEL_FETCH(display) &&
!intel_psr2_sel_fetch_config_valid(intel_dp, crtc_state) &&
!HAS_PSR_HW_TRACKING(display)) {
drm_dbg_kms(display->drm, "Selective update not enabled, selective fetch not valid and no HW tracking available\n"); goto unsupported;
}
if (!psr2_global_enabled(intel_dp)) {
drm_dbg_kms(display->drm, "Selective update disabled by flag\n"); goto unsupported;
}
if (!crtc_state->has_panel_replay && !intel_psr2_config_valid(intel_dp, crtc_state)) goto unsupported;
if (!_compute_psr2_sdp_prior_scanline_indication(intel_dp, crtc_state)) {
drm_dbg_kms(display->drm, "Selective update not enabled, SDP indication do not fit in hblank\n"); goto unsupported;
}
if (crtc_state->has_panel_replay && (DISPLAY_VER(display) < 14 ||
!intel_dp->psr.sink_panel_replay_su_support)) goto unsupported;
if (crtc_state->crc_enabled) {
drm_dbg_kms(display->drm, "Selective update not enabled because it would inhibit pipe CRC calculation\n"); goto unsupported;
}
if (!psr2_granularity_check(intel_dp, crtc_state)) {
drm_dbg_kms(display->drm, "Selective update not enabled, SU granularity not compatible\n"); goto unsupported;
}
if (!panel_replay_global_enabled(intel_dp)) {
drm_dbg_kms(display->drm, "Panel Replay disabled by flag\n"); returnfalse;
}
if (crtc_state->crc_enabled) {
drm_dbg_kms(display->drm, "Panel Replay not enabled because it would inhibit pipe CRC calculation\n"); returnfalse;
}
if (!intel_dp_is_edp(intel_dp)) returntrue;
/* Remaining checks are for eDP only */
if (to_intel_crtc(crtc_state->uapi.crtc)->pipe != PIPE_A &&
to_intel_crtc(crtc_state->uapi.crtc)->pipe != PIPE_B) returnfalse;
/* 128b/132b Panel Replay is not supported on eDP */ if (intel_dp_is_uhbr(crtc_state)) {
drm_dbg_kms(display->drm, "Panel Replay is not supported with 128b/132b\n"); returnfalse;
}
/* HW will not allow Panel Replay on eDP when HDCP enabled */ if (conn_state->content_protection ==
DRM_MODE_CONTENT_PROTECTION_DESIRED ||
(conn_state->content_protection ==
DRM_MODE_CONTENT_PROTECTION_ENABLED && hdcp->value ==
DRM_MODE_CONTENT_PROTECTION_UNDESIRED)) {
drm_dbg_kms(display->drm, "Panel Replay is not supported with HDCP\n"); returnfalse;
}
if (!alpm_config_valid(intel_dp, crtc_state, true)) returnfalse;
/* * FIXME figure out what is wrong with PSR+joiner and * fix it. Presumably something related to the fact that * PSR is a transcoder level feature.
*/ if (crtc_state->joiner_pipes) {
drm_dbg_kms(display->drm, "PSR disabled due to joiner\n"); return;
}
/* Wa_18037818876 */ if (intel_psr_needs_wa_18037818876(intel_dp, crtc_state)) {
crtc_state->has_psr = false;
drm_dbg_kms(display->drm, "PSR disabled to workaround PSR FSM hang issue\n");
}
/* Rest is for Wa_16025596647 */ if (DISPLAY_VER(display) != 20 &&
!IS_DISPLAY_VERx100_STEP(display, 3000, STEP_A0, STEP_B0)) return;
/* Not needed by Panel Replay */ if (crtc_state->has_panel_replay) return;
/* We ignore possible secondary PSR/Panel Replay capable eDP */
for_each_intel_crtc(display->drm, crtc)
active_pipes |= crtc->active ? BIT(crtc->pipe) : 0;
intel_dp = &dig_port->dp; if (!(CAN_PSR(intel_dp) || CAN_PANEL_REPLAY(intel_dp))) return;
mutex_lock(&intel_dp->psr.lock); if (!intel_dp->psr.enabled) goto unlock;
if (intel_dp->psr.panel_replay_enabled) {
pipe_config->has_psr = pipe_config->has_panel_replay = true;
} else { /* * Not possible to read EDP_PSR/PSR2_CTL registers as it is * enabled/disabled because of frontbuffer tracking and others.
*/
pipe_config->has_psr = true;
}
/* * Only HSW and BDW have PSR AUX registers that need to be setup. * SKL+ use hardcoded values PSR AUX transactions
*/ if (DISPLAY_VER(display) < 9)
hsw_psr_setup_aux(intel_dp);
/* * Per Spec: Avoid continuous PSR exit by masking MEMUP and HPD also * mask LPSP to avoid dependency on other drivers that might block * runtime_pm besides preventing other hw tracking issues now we * can rely on frontbuffer tracking. * * From bspec prior LunarLake: * Only PSR_MASK[Mask FBC modify] and PSR_MASK[Mask Hotplug] are used in * panel replay mode. * * From bspec beyod LunarLake: * Panel Replay on DP: No bits are applicable * Panel Replay on eDP: All bits are applicable
*/ if (DISPLAY_VER(display) < 20 || intel_dp_is_edp(intel_dp))
mask = EDP_PSR_DEBUG_MASK_HPD;
if (intel_dp_is_edp(intel_dp)) {
mask |= EDP_PSR_DEBUG_MASK_MEMUP;
/* * For some unknown reason on HSW non-ULT (or at least on * Dell Latitude E6540) external displays start to flicker * when PSR is enabled on the eDP. SR/PC6 residency is much * higher than should be possible with an external display. * As a workaround leave LPSP unmasked to prevent PSR entry * when external displays are active.
*/ if (DISPLAY_VER(display) >= 8 || display->platform.haswell_ult)
mask |= EDP_PSR_DEBUG_MASK_LPSP;
if (DISPLAY_VER(display) < 20)
mask |= EDP_PSR_DEBUG_MASK_MAX_SLEEP;
/* * No separate pipe reg write mask on hsw/bdw, so have to unmask all * registers in order to keep the CURSURFLIVE tricks working :(
*/ if (IS_DISPLAY_VER(display, 9, 10))
mask |= EDP_PSR_DEBUG_MASK_DISP_REG_WRITE;
/* allow PSR with sprite enabled */ if (display->platform.haswell)
mask |= EDP_PSR_DEBUG_MASK_SPRITE_ENABLE;
}
/* * TODO: if future platforms supports DC3CO in more than one * transcoder, EXITLINE will need to be unset when disabling PSR
*/ if (intel_dp->psr.dc3co_exitline)
intel_de_rmw(display,
TRANS_EXITLINE(display, cpu_transcoder),
EXITLINE_MASK,
intel_dp->psr.dc3co_exitline << EXITLINE_SHIFT | EXITLINE_ENABLE);
if (intel_dp->psr.sel_update_enabled) { if (DISPLAY_VER(display) == 9)
intel_de_rmw(display, CHICKEN_TRANS(display, cpu_transcoder), 0,
PSR2_VSC_ENABLE_PROG_HEADER |
PSR2_ADD_VERTICAL_LINE_COUNT);
/* * Wa_16014451276:adlp,mtl[a0,b0] * All supported adlp panels have 1-based X granularity, this may * cause issues if non-supported panels are used.
*/ if (!intel_dp->psr.panel_replay_enabled &&
(IS_DISPLAY_VERx100_STEP(display, 1400, STEP_A0, STEP_B0) ||
display->platform.alderlake_p))
intel_de_rmw(display, CHICKEN_TRANS(display, cpu_transcoder),
0, ADLP_1_BASED_X_GRANULARITY);
if (intel_dp->psr.panel_replay_enabled) goto no_err;
/* * If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR * will still keep the error set even after the reset done in the * irq_preinstall and irq_uninstall hooks. * And enabling in this situation cause the screen to freeze in the * first time that PSR HW tries to activate so lets keep PSR disabled * to avoid any rendering problems.
*/
val = intel_de_read(display, psr_iir_reg(display, cpu_transcoder));
val &= psr_irq_psr_error_bit_get(intel_dp); if (val) {
intel_dp->psr.sink_not_reliable = true;
drm_dbg_kms(display->drm, "PSR interruption error set, not enabling PSR\n"); returnfalse;
}
/* * Enabling sink PSR/Panel Replay here only for PSR. Panel Replay enable * bit is already written at this point. Sink ALPM is enabled here for * PSR and Panel Replay. See * intel_psr_panel_replay_enable_sink. Modifiers/options: * - Selective Update * - Region Early Transport * - Selective Update Region Scanline Capture * - VSC_SDP_CRC * - HPD on different Errors * - CRC verification * are written for PSR and Panel Replay here.
*/
intel_psr_enable_sink(intel_dp, crtc_state);
if (intel_dp_is_edp(intel_dp))
intel_snps_phy_update_psr_power_state(&dig_port->base, true);
/* * Link_ok is sticky and set here on PSR enable. We can assume link * training is complete as we never continue to PSR enable with * untrained link. Link_ok is kept as set until first short pulse
--> --------------------
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