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Message-ID: <068d19ac-2a07-73b8-392b-63b1bd0f0e1c@linaro.org>
Date: Tue, 5 Jul 2022 22:28:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Vinod Polimera <quic_vpolimer@...cinc.com>,
dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, robdclark@...il.com,
dianders@...omium.org, swboyd@...omium.org,
quic_kalyant@...cinc.com, quic_khsieh@...cinc.com,
quic_vproddut@...cinc.com, bjorn.andersson@...aro.org,
quic_aravindh@...cinc.com, quic_abhinavk@...cinc.com,
quic_sbillaka@...cinc.com
Subject: Re: [PATCH v4 3/7] drm/msm/dp: Add basic PSR support for eDP
On 05/07/2022 20:00, Vinod Polimera wrote:
> Add support for basic panel self refresh (PSR) feature for eDP.
> Add a new interface to set PSR state in the sink from DPU.
> Program the eDP controller to issue PSR enter and exit SDP to
> the sink.
>
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> ---
> drivers/gpu/drm/msm/dp/dp_catalog.c | 81 ++++++++++++++++
> drivers/gpu/drm/msm/dp/dp_catalog.h | 4 +
> drivers/gpu/drm/msm/dp/dp_ctrl.c | 76 ++++++++++++++-
> drivers/gpu/drm/msm/dp/dp_ctrl.h | 3 +
> drivers/gpu/drm/msm/dp/dp_display.c | 31 +++---
> drivers/gpu/drm/msm/dp/dp_display.h | 2 +
> drivers/gpu/drm/msm/dp/dp_drm.c | 186 ++++++++++++++++++++++++++++++++++--
> drivers/gpu/drm/msm/dp/dp_drm.h | 9 +-
> drivers/gpu/drm/msm/dp/dp_link.c | 36 +++++++
> drivers/gpu/drm/msm/dp/dp_panel.c | 22 +++++
> drivers/gpu/drm/msm/dp/dp_panel.h | 6 ++
> drivers/gpu/drm/msm/dp/dp_reg.h | 27 ++++++
> 12 files changed, 458 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
> index 7257515..b9021ed 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> @@ -47,6 +47,14 @@
> #define DP_INTERRUPT_STATUS2_MASK \
> (DP_INTERRUPT_STATUS2 << DP_INTERRUPT_STATUS_MASK_SHIFT)
>
> +#define DP_INTERRUPT_STATUS4 \
> + (PSR_UPDATE_INT | PSR_CAPTURE_INT | PSR_EXIT_INT | \
> + PSR_UPDATE_ERROR_INT | PSR_WAKE_ERROR_INT)
> +
> +#define DP_INTERRUPT_MASK4 \
> + (PSR_UPDATE_MASK | PSR_CAPTURE_MASK | PSR_EXIT_MASK | \
> + PSR_UPDATE_ERROR_MASK | PSR_WAKE_ERROR_MASK)
> +
> struct dp_catalog_private {
> struct device *dev;
> struct drm_device *drm_dev;
> @@ -359,6 +367,24 @@ void dp_catalog_ctrl_lane_mapping(struct dp_catalog *dp_catalog)
> ln_mapping);
> }
>
> +void dp_catalog_ctrl_psr_mainlink_enable(struct dp_catalog *dp_catalog,
> + bool enable)
> +{
> + u32 val;
> + struct dp_catalog_private *catalog = container_of(dp_catalog,
> + struct dp_catalog_private, dp_catalog);
> +
> + val = dp_read_link(catalog, REG_DP_MAINLINK_CTRL);
> + val &= ~DP_MAINLINK_CTRL_ENABLE;
> +
> + if (enable)
> + val |= DP_MAINLINK_CTRL_ENABLE;
> + else
> + val &= ~DP_MAINLINK_CTRL_ENABLE;
> +
> + dp_write_link(catalog, REG_DP_MAINLINK_CTRL, val);
> +}
> +
> void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog,
> bool enable)
> {
> @@ -610,6 +636,47 @@ void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog)
> dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
> }
>
> +static void dp_catalog_enable_sdp(struct dp_catalog_private *catalog)
> +{
> + /* trigger sdp */
> + dp_write_link(catalog, MMSS_DP_SDP_CFG3, UPDATE_SDP);
> + dp_write_link(catalog, MMSS_DP_SDP_CFG3, !UPDATE_SDP);
> +}
> +
> +void dp_catalog_ctrl_config_psr(struct dp_catalog *dp_catalog)
> +{
> + struct dp_catalog_private *catalog = container_of(dp_catalog,
> + struct dp_catalog_private, dp_catalog);
> + u32 config;
> +
> + /* enable PSR1 function */
> + config = dp_read_link(catalog, REG_PSR_CONFIG);
> + config |= PSR1_SUPPORTED;
> + dp_write_link(catalog, REG_PSR_CONFIG, config);
> +
> + dp_write_ahb(catalog, REG_DP_INTR_MASK4, DP_INTERRUPT_MASK4);
> + dp_catalog_enable_sdp(catalog);
> +}
> +
> +void dp_catalog_ctrl_set_psr(struct dp_catalog *dp_catalog, bool enter)
> +{
> + struct dp_catalog_private *catalog = container_of(dp_catalog,
> + struct dp_catalog_private, dp_catalog);
> + u32 cmd;
> +
> + cmd = dp_read_link(catalog, REG_PSR_CMD);
> +
> + cmd &= ~(PSR_ENTER | PSR_EXIT);
> +
> + if (enter)
> + cmd |= PSR_ENTER;
> + else
> + cmd |= PSR_EXIT;
> +
> + dp_catalog_enable_sdp(catalog);
> + dp_write_link(catalog, REG_PSR_CMD, cmd);
> +}
> +
> u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog)
> {
> struct dp_catalog_private *catalog = container_of(dp_catalog,
> @@ -645,6 +712,20 @@ u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog)
> return isr & (mask | ~DP_DP_HPD_INT_MASK);
> }
>
> +int dp_catalog_ctrl_read_psr_interrupt_status(struct dp_catalog *dp_catalog)
> +{
> + struct dp_catalog_private *catalog = container_of(dp_catalog,
> + struct dp_catalog_private, dp_catalog);
> + u32 intr, intr_ack;
> +
> + intr = dp_read_ahb(catalog, REG_DP_INTR_STATUS4);
> + intr_ack = (intr & DP_INTERRUPT_STATUS4)
> + << DP_INTERRUPT_STATUS_ACK_SHIFT;
> + dp_write_ahb(catalog, REG_DP_INTR_STATUS4, intr_ack);
> +
> + return intr;
> +}
> +
> int dp_catalog_ctrl_get_interrupt(struct dp_catalog *dp_catalog)
> {
> struct dp_catalog_private *catalog = container_of(dp_catalog,
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
> index 1f717f4..6454845 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
> @@ -93,6 +93,7 @@ void dp_catalog_ctrl_state_ctrl(struct dp_catalog *dp_catalog, u32 state);
> void dp_catalog_ctrl_config_ctrl(struct dp_catalog *dp_catalog, u32 config);
> void dp_catalog_ctrl_lane_mapping(struct dp_catalog *dp_catalog);
> void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog, bool enable);
> +void dp_catalog_ctrl_psr_mainlink_enable(struct dp_catalog *dp_catalog, bool enable);
> void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb);
> void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate,
> u32 stream_rate_khz, bool fixed_nvid);
> @@ -104,12 +105,15 @@ void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
> void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
> u32 intr_mask, bool en);
> void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog);
> +void dp_catalog_ctrl_config_psr(struct dp_catalog *dp_catalog);
> +void dp_catalog_ctrl_set_psr(struct dp_catalog *dp_catalog, bool enter);
> u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog);
> u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog);
> void dp_catalog_ctrl_phy_reset(struct dp_catalog *dp_catalog);
> int dp_catalog_ctrl_update_vx_px(struct dp_catalog *dp_catalog, u8 v_level,
> u8 p_level);
> int dp_catalog_ctrl_get_interrupt(struct dp_catalog *dp_catalog);
> +int dp_catalog_ctrl_read_psr_interrupt_status(struct dp_catalog *dp_catalog);
> void dp_catalog_ctrl_update_transfer_unit(struct dp_catalog *dp_catalog,
> u32 dp_tu, u32 valid_boundary,
> u32 valid_boundary2);
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index d21971b..485e8f5 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -22,6 +22,7 @@
>
> #define DP_KHZ_TO_HZ 1000
> #define IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES (30 * HZ / 1000) /* 30 ms */
> +#define PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES (300 * HZ / 1000) /* 300 ms */
> #define WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2)
>
> #define DP_CTRL_INTR_READY_FOR_VIDEO BIT(0)
> @@ -80,6 +81,7 @@ struct dp_ctrl_private {
> struct dp_catalog *catalog;
>
> struct completion idle_comp;
> + struct completion psr_op_comp;
> struct completion video_comp;
> };
>
> @@ -153,6 +155,9 @@ static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
> config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN;
> config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK;
>
> + if (ctrl->panel->psr_cap.version)
> + config |= DP_CONFIGURATION_CTRL_SEND_VSC;
> +
> dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
> }
>
> @@ -1382,11 +1387,64 @@ static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl)
> return ret;
> }
>
> -void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
> +void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl)
> {
> - struct dp_ctrl_private *ctrl;
> + u8 cfg;
> + struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
> + struct dp_ctrl_private, dp_ctrl);
>
> - ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
> + if (!ctrl->panel->psr_cap.version)
> + return;
> +
> + dp_catalog_ctrl_config_psr(ctrl->catalog);
> +
> + cfg = DP_PSR_ENABLE;
> + drm_dp_dpcd_write(ctrl->aux, DP_PSR_EN_CFG, &cfg, 1);
> +}
> +
> +void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enter)
> +{
> + struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
> + struct dp_ctrl_private, dp_ctrl);
> +
> + if (!ctrl->panel->psr_cap.version)
> + return;
> +
> + /*
> + * When entering PSR,
> + * 1. Send PSR enter SDP and wait for the PSR_UPDATE_INT
> + * 2. Turn off video
> + * 3. Disable the mainlink
> + *
> + * When exiting PSR,
> + * 1. Enable the mainlink
> + * 2. Send the PSR exit SDP
> + */
> + if (enter) {
> + reinit_completion(&ctrl->psr_op_comp);
> + dp_catalog_ctrl_set_psr(ctrl->catalog, true);
> +
> + if (!wait_for_completion_timeout(&ctrl->psr_op_comp,
> + PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES)) {
> + DRM_ERROR("PSR_ENTRY timedout\n");
> + dp_catalog_ctrl_set_psr(ctrl->catalog, false);
> + return;
> + }
> +
> + dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
> +
> + dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, false);
> + } else {
> + dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, true);
> +
> + dp_catalog_ctrl_set_psr(ctrl->catalog, false);
> + }
> +}
> +
> +void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
Please revert this part (dp_ctrl_reset_irq_ctrl()), so that there are no
'extra' changes. The patch is big enough w/o them.
> +{
> + struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
> + struct dp_ctrl_private, dp_ctrl);
>
> dp_catalog_ctrl_reset(ctrl->catalog);
>
> @@ -1997,6 +2055,17 @@ void dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
>
> ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
>
> + if (ctrl->panel->psr_cap.version) {
> + isr = dp_catalog_ctrl_read_psr_interrupt_status(ctrl->catalog);
> +
> + if (isr == PSR_UPDATE_INT)
> + drm_dbg_dp(ctrl->drm_dev, "PSR frame update done\n");
> + else if (isr == PSR_EXIT_INT)
> + drm_dbg_dp(ctrl->drm_dev, "PSR exit done\n");
> +
> + complete(&ctrl->psr_op_comp);
Do we always need to complete on psr_op_comp? Maybe only if isr is
sensible? Otherwise the driver would complete psr_op_comp on each and
every DP interrupt.
> + }
> +
> isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);
>
> if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
> @@ -2043,6 +2112,7 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
> dev_err(dev, "failed to add DP OPP table\n");
>
> init_completion(&ctrl->idle_comp);
> + init_completion(&ctrl->psr_op_comp);
> init_completion(&ctrl->video_comp);
>
> /* in parameters */
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> index 0745fde..be074ae 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> @@ -38,4 +38,7 @@ void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl);
> void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl);
> void dp_ctrl_irq_phy_exit(struct dp_ctrl *dp_ctrl);
>
> +void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enable);
> +void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl);
> +
> #endif /* _DP_CTRL_H_ */
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index bce7793..2b3ec6b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -388,6 +388,8 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
>
> edid = dp->panel->edid;
>
> + dp->dp_display.psr_supported = !!dp->panel->psr_cap.version;
> +
> dp->audio_supported = drm_detect_monitor_audio(edid);
> dp_panel_handle_sink_request(dp->panel);
>
> @@ -895,6 +897,10 @@ static int dp_display_post_enable(struct msm_dp *dp_display)
>
> /* signal the connect event late to synchronize video and display */
> dp_display_handle_plugged_change(dp_display, true);
> +
> + if (dp_display->psr_supported)
> + dp_ctrl_config_psr(dp->ctrl);
> +
> return 0;
> }
>
> @@ -980,14 +986,6 @@ enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
> return -EINVAL;
> }
>
> - /*
> - * The eDP controller currently does not have a reliable way of
> - * enabling panel power to read sink capabilities. So, we rely
> - * on the panel driver to populate only supported modes for now.
> - */
> - if (dp->is_edp)
> - return MODE_OK;
I'd split this to a separate commit.
> -
> if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
> return MODE_BAD;
>
> @@ -1094,6 +1092,14 @@ static void dp_display_config_hpd(struct dp_display_private *dp)
> enable_irq(dp->irq);
> }
>
> +void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
> +{
> + struct dp_display_private *dp;
> +
> + dp = container_of(dp_display, struct dp_display_private, dp_display);
> + dp_ctrl_set_psr(dp->ctrl, enter);
> +}
> +
> static int hpd_event_thread(void *data)
> {
> struct dp_display_private *dp_priv;
> @@ -1652,7 +1658,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
> return 0;
> }
>
> -void dp_bridge_enable(struct drm_bridge *drm_bridge)
> +void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
This also should go to a separate commit.
> {
> struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
> struct msm_dp *dp = dp_bridge->dp_display;
> @@ -1716,7 +1723,8 @@ void dp_bridge_enable(struct drm_bridge *drm_bridge)
> mutex_unlock(&dp_display->event_mutex);
> }
>
> -void dp_bridge_disable(struct drm_bridge *drm_bridge)
> +void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> {
> struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
> struct msm_dp *dp = dp_bridge->dp_display;
> @@ -1727,7 +1735,8 @@ void dp_bridge_disable(struct drm_bridge *drm_bridge)
> dp_ctrl_push_idle(dp_display->ctrl);
> }
>
> -void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
> +void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> {
> struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
> struct msm_dp *dp = dp_bridge->dp_display;
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> index 4f9fe4d..1feaada 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> @@ -29,6 +29,7 @@ struct msm_dp {
>
> u32 max_dp_lanes;
> struct dp_audio *dp_audio;
> + bool psr_supported;
> };
>
> int dp_display_set_plugged_cb(struct msm_dp *dp_display,
> @@ -39,5 +40,6 @@ bool dp_display_check_video_test(struct msm_dp *dp_display);
> int dp_display_get_test_bpp(struct msm_dp *dp_display);
> void dp_display_signal_audio_start(struct msm_dp *dp_display);
> void dp_display_signal_audio_complete(struct msm_dp *dp_display);
> +void dp_display_set_psr(struct msm_dp *dp, bool enter);
>
> #endif /* _DP_DISPLAY_H_ */
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index 62d58b9..b9cf6c27 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -60,14 +60,184 @@ static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *
> return rc;
> }
>
> +static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct msm_dp *dp;
> +
> + dp = to_dp_bridge(drm_bridge)->dp_display;
> + if (WARN_ON(!conn_state))
> + return -ENODEV;
> +
> + if (dp->psr_supported)
> + conn_state->self_refresh_aware = true;
> +
> + if (!conn_state->crtc || !crtc_state)
> + return 0;
> +
> + if (crtc_state->self_refresh_active && !dp->psr_supported)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static void edp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *old_crtc_state;
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
> + struct msm_dp *dp = dp_bridge->dp_display;
> +
> + /*
> + * Check the old state of the crtc to determine if the panel
> + * was put into psr state previously by the edp_bridge_atomic_disable.
> + * If the panel is in psr, just exit psr state and skip the full
> + * bridge enable sequence.
> + */
> + crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, dp->encoder);
> + if (!crtc)
> + return;
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
> +
> + if (old_crtc_state && old_crtc_state->self_refresh_active) {
> + dp_display_set_psr(dp, false);
> + return;
> + }
> +
> + dp_bridge_atomic_enable(drm_bridge, old_bridge_state);
> +}
> +
> +static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *new_crtc_state = NULL, *old_crtc_state = NULL;
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
> + struct msm_dp *dp = dp_bridge->dp_display;
> +
> + crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, dp->encoder);
> + if (!crtc)
> + goto out;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
> + if (!new_crtc_state)
> + goto out;
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
> + if (!old_crtc_state)
> + goto out;
> +
> + /*
> + * Set self refresh mode if current crtc state is active.
> + *
> + * If old crtc state is active, then this is a display disable
> + * call while the sink is in psr state. So, exit psr here.
> + * The eDP controller will be disabled in the
> + * edp_bridge_atomic_post_disable function.
> + *
> + * We observed sink is stuck in self refresh if psr exit is skipped
> + * when display disable occurs while the sink is in psr state.
> + */
> + if (new_crtc_state->self_refresh_active) {
> + dp_display_set_psr(dp, true);
> + return;
> + } else if (old_crtc_state->self_refresh_active) {
> + dp_display_set_psr(dp, false);
> + return;
> + }
> +
> +out:
> + dp_bridge_atomic_disable(drm_bridge, old_bridge_state);
> +}
> +
> +static void edp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *new_crtc_state = NULL;
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
> + struct msm_dp *dp = dp_bridge->dp_display;
> +
> + crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, dp->encoder);
> + if (!crtc)
> + return;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
> + if (!new_crtc_state)
> + return;
> +
> + /*
> + * Self refresh mode is already set in edp_bridge_atomic_disable.
> + */
> + if (new_crtc_state->self_refresh_active)
> + return;
> +
> + dp_bridge_atomic_post_disable(drm_bridge, old_bridge_state);
> +}
> +
> +/**
> + * edp_bridge_mode_valid - callback to determine if specified mode is valid
> + * @bridge: Pointer to drm bridge structure
> + * @info: display info
> + * @mode: Pointer to drm mode structure
> + * Returns: Validity status for specified mode
> + */
> +static enum drm_mode_status edp_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + struct msm_dp *dp;
> + int mode_pclk_khz = mode->clock;
> +
> + dp = to_dp_bridge(bridge)->dp_display;
> +
> + if (!dp || !mode_pclk_khz || !dp->connector) {
> + DRM_ERROR("invalid params\n");
> + return -EINVAL;
> + }
> +
> + if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
> + return MODE_CLOCK_HIGH;
> +
> + /*
> + * The eDP controller currently does not have a reliable way of
> + * enabling panel power to read sink capabilities. So, we rely
> + * on the panel driver to populate only supported modes for now.
> + */
> + return MODE_OK;
> +}
> +
> +static const struct drm_bridge_funcs edp_bridge_ops = {
> + .atomic_enable = edp_bridge_atomic_enable,
> + .atomic_disable = edp_bridge_atomic_disable,
> + .atomic_post_disable = edp_bridge_atomic_post_disable,
> + .mode_set = dp_bridge_mode_set,
> + .mode_valid = edp_bridge_mode_valid,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_check = edp_bridge_atomic_check,
> +};
> +
> static const struct drm_bridge_funcs dp_bridge_ops = {
> - .enable = dp_bridge_enable,
> - .disable = dp_bridge_disable,
> - .post_disable = dp_bridge_post_disable,
> - .mode_set = dp_bridge_mode_set,
> - .mode_valid = dp_bridge_mode_valid,
> - .get_modes = dp_bridge_get_modes,
> - .detect = dp_bridge_detect,
> + .atomic_enable = dp_bridge_atomic_enable,
> + .atomic_disable = dp_bridge_atomic_disable,
> + .atomic_post_disable = dp_bridge_atomic_post_disable,
> + .mode_set = dp_bridge_mode_set,
> + .mode_valid = dp_bridge_mode_valid,
> + .get_modes = dp_bridge_get_modes,
> + .detect = dp_bridge_detect,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_check = edp_bridge_atomic_check,
No fancy indentation/tabs please.
> };
>
> struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> @@ -84,7 +254,7 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *
> dp_bridge->dp_display = dp_display;
>
> bridge = &dp_bridge->bridge;
> - bridge->funcs = &dp_bridge_ops;
> + bridge->funcs = dp_display->is_edp ? &edp_bridge_ops : &dp_bridge_ops;
> bridge->type = dp_display->connector_type;
>
> /*
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h
> index f4b1ed1..6b8ef29 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.h
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.h
> @@ -23,9 +23,12 @@ struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display);
> struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> struct drm_encoder *encoder);
>
> -void dp_bridge_enable(struct drm_bridge *drm_bridge);
> -void dp_bridge_disable(struct drm_bridge *drm_bridge);
> -void dp_bridge_post_disable(struct drm_bridge *drm_bridge);
> +void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state);
> +void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state);
> +void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state);
> enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
> const struct drm_display_info *info,
> const struct drm_display_mode *mode);
> diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
> index 36f0af0..84af70a 100644
> --- a/drivers/gpu/drm/msm/dp/dp_link.c
> +++ b/drivers/gpu/drm/msm/dp/dp_link.c
> @@ -934,6 +934,38 @@ static int dp_link_process_phy_test_pattern_request(
> return 0;
> }
>
> +static bool dp_link_read_psr_error_status(struct dp_link_private *link)
> +{
> + u8 status;
> +
> + drm_dp_dpcd_read(link->aux, DP_PSR_ERROR_STATUS, &status, 1);
> +
> + if (status & DP_PSR_LINK_CRC_ERROR)
> + DRM_ERROR("PSR LINK CRC ERROR\n");
> + else if (status & DP_PSR_RFB_STORAGE_ERROR)
> + DRM_ERROR("PSR RFB STORAGE ERROR\n");
> + else if (status & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
> + DRM_ERROR("PSR VSC SDP UNCORRECTABLE ERROR\n");
> + else
> + return false;
> +
> + return true;
> +}
> +
> +static bool dp_link_psr_capability_changed(struct dp_link_private *link)
> +{
> + u8 status;
> +
> + drm_dp_dpcd_read(link->aux, DP_PSR_ESI, &status, 1);
> +
> + if (status & DP_PSR_CAPS_CHANGE) {
> + drm_dbg_dp(link->drm_dev, "PSR Capability Change\n");
> + return true;
> + }
> +
> + return false;
> +}
> +
> static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
> {
> return link_status[r - DP_LANE0_1_STATUS];
> @@ -1053,6 +1085,10 @@ int dp_link_process_request(struct dp_link *dp_link)
> dp_link->sink_request |= DP_TEST_LINK_TRAINING;
> } else if (!dp_link_process_phy_test_pattern_request(link)) {
> dp_link->sink_request |= DP_TEST_LINK_PHY_TEST_PATTERN;
> + } else if (dp_link_read_psr_error_status(link)) {
> + DRM_ERROR("PSR IRQ_HPD received\n");
> + } else if (dp_link_psr_capability_changed(link)) {
> + drm_dbg_dp(link->drm_dev, "PSR Capabiity changed");
> } else {
> ret = dp_link_process_link_status_update(link);
> if (!ret) {
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
> index 5149ceb..8bf8ab4 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -20,6 +20,27 @@ struct dp_panel_private {
> bool aux_cfg_update_done;
> };
>
> +static void dp_panel_read_psr_cap(struct dp_panel_private *panel)
> +{
> + ssize_t rlen;
> + struct dp_panel *dp_panel;
> +
> + dp_panel = &panel->dp_panel;
> +
> + /* edp sink */
> + if (dp_panel->dpcd[DP_EDP_CONFIGURATION_CAP]) {
> + rlen = drm_dp_dpcd_read(panel->aux, DP_PSR_SUPPORT,
> + &dp_panel->psr_cap, sizeof(dp_panel->psr_cap));
> + if (rlen == sizeof(dp_panel->psr_cap)) {
> + drm_dbg_dp(panel->drm_dev,
> + "psr version: 0x%x, psr_cap: 0x%x\n",
> + dp_panel->psr_cap.version,
> + dp_panel->psr_cap.capabilities);
> + } else
> + DRM_ERROR("failed to read psr info, rlen=%zd\n", rlen);
> + }
> +}
> +
> static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
> {
> int rc = 0;
> @@ -106,6 +127,7 @@ static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
> }
> }
>
> + dp_panel_read_psr_cap(panel);
> end:
> return rc;
> }
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
> index d861197a..2d0826a 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.h
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.h
> @@ -34,6 +34,11 @@ struct dp_panel_in {
> struct dp_catalog *catalog;
> };
>
> +struct dp_panel_psr {
> + u8 version;
> + u8 capabilities;
> +};
> +
> struct dp_panel {
> /* dpcd raw data */
> u8 dpcd[DP_RECEIVER_CAP_SIZE + 1];
> @@ -46,6 +51,7 @@ struct dp_panel {
> struct edid *edid;
> struct drm_connector *connector;
> struct dp_display_mode dp_mode;
> + struct dp_panel_psr psr_cap;
> bool video_test;
>
> u32 vic;
> diff --git a/drivers/gpu/drm/msm/dp/dp_reg.h b/drivers/gpu/drm/msm/dp/dp_reg.h
> index 2686028..ea85a69 100644
> --- a/drivers/gpu/drm/msm/dp/dp_reg.h
> +++ b/drivers/gpu/drm/msm/dp/dp_reg.h
> @@ -22,6 +22,20 @@
> #define REG_DP_INTR_STATUS2 (0x00000024)
> #define REG_DP_INTR_STATUS3 (0x00000028)
>
> +#define REG_DP_INTR_STATUS4 (0x0000002C)
> +#define PSR_UPDATE_INT (0x00000001)
> +#define PSR_CAPTURE_INT (0x00000004)
> +#define PSR_EXIT_INT (0x00000010)
> +#define PSR_UPDATE_ERROR_INT (0x00000040)
> +#define PSR_WAKE_ERROR_INT (0x00000100)
> +
> +#define REG_DP_INTR_MASK4 (0x00000030)
> +#define PSR_UPDATE_MASK (0x00000001)
> +#define PSR_CAPTURE_MASK (0x00000002)
> +#define PSR_EXIT_MASK (0x00000004)
> +#define PSR_UPDATE_ERROR_MASK (0x00000008)
> +#define PSR_WAKE_ERROR_MASK (0x00000010)
> +
> #define REG_DP_DP_HPD_CTRL (0x00000000)
> #define DP_DP_HPD_CTRL_HPD_EN (0x00000001)
>
> @@ -164,6 +178,16 @@
> #define MMSS_DP_AUDIO_TIMING_RBR_48 (0x00000094)
> #define MMSS_DP_AUDIO_TIMING_HBR_48 (0x00000098)
>
> +#define REG_PSR_CONFIG (0x00000100)
> +#define DISABLE_PSR (0x00000000)
> +#define PSR1_SUPPORTED (0x00000001)
> +#define PSR2_WITHOUT_FRAMESYNC (0x00000002)
> +#define PSR2_WITH_FRAMESYNC (0x00000003)
> +
> +#define REG_PSR_CMD (0x00000110)
> +#define PSR_ENTER (0x00000001)
> +#define PSR_EXIT (0x00000002)
> +
> #define MMSS_DP_PSR_CRC_RG (0x00000154)
> #define MMSS_DP_PSR_CRC_B (0x00000158)
>
> @@ -184,6 +208,9 @@
> #define MMSS_DP_AUDIO_STREAM_0 (0x00000240)
> #define MMSS_DP_AUDIO_STREAM_1 (0x00000244)
>
> +#define MMSS_DP_SDP_CFG3 (0x0000024c)
> +#define UPDATE_SDP (0x00000001)
> +
> #define MMSS_DP_EXTENSION_0 (0x00000250)
> #define MMSS_DP_EXTENSION_1 (0x00000254)
> #define MMSS_DP_EXTENSION_2 (0x00000258)
--
With best wishes
Dmitry
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