Re: [PATCH v2 1/4] drm/msm/dp: Add basic PSR support for eDP

Dmitry Baryshkov
2022-02-22T03:12:16Z

On Mon, 21 Feb 2022 at 17:52, Vinod Polimera <quic_vpolimer@quicinc.com> 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@quicinc.com>
>
> Changes in v2:
> - Use dp bridge to set psr entry/exit instead of dpu_enocder
> - Don't modify whitespaces
> - set self refresh aware from atomic_check
> - set self refresh aware only if psr is supported
> - provide a stub for msm_dp_display_set_psr
> ---
> 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 | 63 +++++++++++++
> drivers/gpu/drm/msm/dp/dp_ctrl.h | 3 +
> drivers/gpu/drm/msm/dp/dp_display.c | 14 +++
> drivers/gpu/drm/msm/dp/dp_display.h | 1 +
> drivers/gpu/drm/msm/dp/dp_drm.c | 177 ++++++++++++++++++++++++++++++++++--
> drivers/gpu/drm/msm/dp/dp_link.c | 22 +++++
> drivers/gpu/drm/msm/dp/dp_panel.c | 21 +++++
> drivers/gpu/drm/msm/dp/dp_panel.h | 6 ++
> drivers/gpu/drm/msm/dp/dp_reg.h | 19 ++++
> drivers/gpu/drm/msm/msm_drv.h | 6 ++
> 12 files changed, 411 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
> index 8a6d3ea..3cd223d 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> @@ -45,6 +45,14 @@
> #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 dp_io *io;
> @@ -343,6 +351,20 @@ 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 mainlink_ctrl;
> + struct dp_catalog_private *catalog = container_of(dp_catalog,
> + struct dp_catalog_private, dp_catalog);
> +
> + mainlink_ctrl = dp_read_link(catalog, REG_DP_MAINLINK_CTRL);
> + mainlink_ctrl &= ~DP_MAINLINK_CTRL_ENABLE;
> + mainlink_ctrl |= (enable & DP_MAINLINK_CTRL_ENABLE);
> +
> + dp_write_link(catalog, REG_DP_MAINLINK_CTRL, mainlink_ctrl);
> +}
> +
> void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog,
> bool enable)
> {
> @@ -581,6 +603,51 @@ 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, 0x1);
> + dp_write_link(catalog, MMSS_DP_SDP_CFG3, 0x0);
> +}
> +
> +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 psr_config;
> +
> + /* enable PSR1 function */
> + psr_config = dp_read_link(catalog, REG_PSR_CONFIG);
> + psr_config |= BIT(0);
> + dp_write_link(catalog, REG_PSR_CONFIG, psr_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 psr_cmd;
> +
> + psr_cmd = dp_read_link(catalog, REG_PSR_CMD);
> +
> + /*
> + * BIT(0) - send psr entry SDP
> + * BIT(1) - sned psr exit SDP
> + */
> + psr_cmd &= ~(BIT(0) | BIT(1));
> +
> + if (enter)
> + psr_cmd |= BIT(0);
> + else
> + psr_cmd |= BIT(1);
> +
> + dp_catalog_enable_sdp(catalog);
> + dp_write_link(catalog, REG_PSR_CMD, psr_cmd);
> +}
> +
> u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog)
> {
> struct dp_catalog_private *catalog = container_of(dp_catalog,
> @@ -608,6 +675,20 @@ u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog)
> return isr;
> }
>
> +int dp_catalog_ctrl_get_psr_interrupt(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 6965afa..9b1b199 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
> @@ -91,6 +91,7 @@ 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);
> @@ -101,12 +102,15 @@ 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_get_psr_interrupt(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 88ca6c3..ba828ea 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -21,6 +21,7 @@
>
> #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)
> @@ -78,6 +79,7 @@ struct dp_ctrl_private {
> struct dp_catalog *catalog;
>
> struct completion idle_comp;
> + struct completion psr_op_comp;
> struct completion video_comp;
> };
>
> @@ -151,6 +153,9 @@ 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);
> }
>
> @@ -1365,6 +1370,52 @@ static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl)
> return ret;
> }
>
> +void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl)
> +{
> + struct dp_ctrl_private *ctrl;
> + u8 psr_config;
> +
> + 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);
> +
> + psr_config = DP_PSR_ENABLE;
> + drm_dp_dpcd_write(ctrl->aux, DP_PSR_EN_CFG, &psr_config, 1);
> +}
> +
> +void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enter)
> +{
> + struct dp_ctrl_private *ctrl;
> +
> + ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
> +
> + if (!ctrl->panel->psr_cap.version)
> + return;
> +
> + 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);
> + }
> +}
> +
> int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip, bool reset)
> {
> struct dp_ctrl_private *ctrl;
> @@ -1964,6 +2015,17 @@ 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_get_psr_interrupt(ctrl->catalog);
> +
> + if (isr == 0x1)
> + DRM_DEBUG_DP("PSR frame update done\n");
> + else if (isr == 0x10)
> + DRM_DEBUG_DP("PSR exit done\n");
> +
> + complete(&ctrl->psr_op_comp);
> + }
> +
> isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);
>
> if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
> @@ -2010,6 +2072,7 @@ 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 2363a2d..f623035 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> @@ -34,4 +34,7 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
> struct dp_power *power, struct dp_catalog *catalog,
> struct dp_parser *parser);
>
> +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 5d314e6..c8d02fb 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -347,6 +347,8 @@ 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);
>
> @@ -871,6 +873,10 @@ 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;
> }
>
> @@ -1037,6 +1043,14 @@ static void dp_display_config_hpd(struct dp_display_private *dp)
> enable_irq(dp->irq);
> }
>
> +void msm_dp_display_set_psr(struct msm_dp *dp_display, bool enter)

If this function is used only by the dp code, there is no need to
pollute the msm_dp_* namespace.
Please rename to dp_display_set_psr() and remove declaration from msm_drv.h.

> +{
> + 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;
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> index e3adcd5..6f512f3 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> @@ -28,6 +28,7 @@ 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,
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index 2436329..d26ca6a 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -142,6 +142,35 @@ static enum drm_mode_status edp_connector_mode_valid(
> return MODE_OK;
> }
>
> +
> +

Extra empty lines.

> +static int edp_connector_atomic_check(struct drm_connector *connector,
> + struct drm_atomic_state *state)
> +{
> + struct msm_dp *dp;
> + struct drm_connector_state *conn_state;
> + struct drm_crtc_state *crtc_state;
> +
> + dp = to_dp_connector(connector)->dp_display;
> + conn_state = drm_atomic_get_new_connector_state(state, connector);
> + if (WARN_ON(!conn_state))
> + return -ENODEV;
> +
> + conn_state->self_refresh_aware = true;

I see that analogix bridge does the same. However I think it would be
better to set self_refresh_aware to true only if the actual attached
panel supports PSR.

> +
> + if (!conn_state->crtc)
> + return 0;
> +
> + crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> + if (!crtc_state)
> + return 0;
> +
> + if (crtc_state->self_refresh_active && !dp->psr_supported)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> static const struct drm_connector_funcs dp_connector_funcs = {
> .detect = dp_connector_detect,
> .fill_modes = drm_helper_probe_single_connector_modes,
> @@ -151,6 +180,11 @@ static const struct drm_connector_funcs dp_connector_funcs = {
> .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> };
>
> +static const struct drm_connector_helper_funcs dp_connector_helper_funcs = {
> + .get_modes = dp_connector_get_modes,
> + .mode_valid = dp_connector_mode_valid,
> +};
> +

Unnecessary movement.

> static const struct drm_connector_funcs edp_connector_funcs = {
> .fill_modes = drm_helper_probe_single_connector_modes,
> .destroy = drm_connector_cleanup,
> @@ -159,12 +193,8 @@ static const struct drm_connector_funcs edp_connector_funcs = {
> .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> };
>
> -static const struct drm_connector_helper_funcs dp_connector_helper_funcs = {
> - .get_modes = dp_connector_get_modes,
> - .mode_valid = dp_connector_mode_valid,
> -};
> -
> static const struct drm_connector_helper_funcs edp_connector_helper_funcs = {
> + .atomic_check = edp_connector_atomic_check,
> .get_modes = edp_connector_get_modes,
> .mode_valid = edp_connector_mode_valid,
> };
> @@ -258,6 +288,130 @@ static void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
> msm_dp_display_disable(dp_display, drm_bridge->encoder);
> }
>
> +static struct drm_crtc *dp_bridge_get_old_connector_crtc(struct msm_dp *dp,
> + struct drm_atomic_state *state)
> +{
> + struct drm_encoder *encoder = dp->encoder;
> + struct drm_connector *connector;
> + struct drm_connector_state *conn_state;
> +
> + connector = drm_atomic_get_old_connector_for_encoder(state, encoder);
> + if (!connector)
> + return NULL;
> +
> + conn_state = drm_atomic_get_old_connector_state(state, connector);
> + if (!conn_state)
> + return NULL;
> +
> + return conn_state->crtc;
> +}
> +
> +static struct drm_crtc *dp_bridge_get_new_connector_crtc(struct msm_dp *dp,
> + struct drm_atomic_state *state)
> +{
> + struct drm_encoder *encoder = dp->encoder;
> + struct drm_connector *connector;
> + struct drm_connector_state *conn_state;
> +
> + connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
> + if (!connector)
> + return NULL;
> +
> + conn_state = drm_atomic_get_new_connector_state(state, connector);
> + if (!conn_state)
> + return NULL;
> +
> + return conn_state->crtc;
> +}

This code being repeated over and over again deserves to become a new
atomic helper.
Please move it to drm_atomic.c or .h

> +
> +static void edp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *old_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_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + crtc = dp_bridge_get_new_connector_crtc(dp_display, old_state);
> + if (!crtc)
> + return;
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);

Generic remark to this and the following functions. I don't quite like
the idea of the bridge drivers poking into the crtc state. This looks
like a breach of layering.
The code looks similar to analogix'es one. Maybe we should consider
moving it into common helpers? This would require adding
enable/disable_srr as drm_bridge ops.
Or to introduce drm_bridge_helper_funcs.

> +
> + /* Exit from self refresh mode */
> + if (old_crtc_state && old_crtc_state->self_refresh_active) {
> + msm_dp_display_set_psr(dp_display, false);
> + return;
> + }
> +
> + msm_dp_display_enable(dp_display, drm_bridge->encoder);
> +}
> +
> +static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *old_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_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + crtc = dp_bridge_get_old_connector_crtc(dp_display, old_state);
> + if (!crtc)
> + goto out;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
> + if (!new_crtc_state)
> + goto out;
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
> + if (!old_crtc_state)
> + goto out;
> +
> + /*
> + * Set self refresh mode if current crtc state is active.
> + * If old crtc state is active, exit psr before disabling
> + * the controller. Observed sink stuck in self refresh
> + * if psr exit is skipped when screen off occurs with
> + * sink in psr mode.
> + */
> + if (new_crtc_state->self_refresh_active) {
> + msm_dp_display_set_psr(dp_display, true);
> + return;
> + } else if (old_crtc_state->self_refresh_active) {
> + msm_dp_display_set_psr(dp_display, false);
> + return;

I think the return here is wrong. Where do we support the case when
the old state was the PSR, but the new states tells us to disable the
crtc? If I understand the drm code correctly, it's a legit case.

> + }
> +
> +out:
> + msm_dp_display_pre_disable(dp_display, drm_bridge->encoder);
> +}
> +
> +static void edp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *old_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_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + crtc = dp_bridge_get_old_connector_crtc(dp_display, old_state);
> + if (!crtc)
> + return;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
> + if (!new_crtc_state)
> + return;
> +
> + /* Self refresh mode is set in dp_bridge_disable. Skip disable */

edp_bridge_atomic_disable?

> + if (new_crtc_state->self_refresh_active)
> + return;
> +
> + msm_dp_display_disable(dp_display, drm_bridge->encoder);
> +}
> +
> static const struct drm_bridge_funcs dp_bridge_ops = {
> .enable = dp_bridge_enable,
> .disable = dp_bridge_disable,
> @@ -265,6 +419,16 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
> .mode_set = dp_bridge_mode_set,
> };
>
> +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,
> + .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,
> +};
> +
> struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> struct drm_encoder *encoder)
> {
> @@ -279,7 +443,8 @@ struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_devi
> dp_bridge->dp_display = dp_display;
>
> bridge = &dp_bridge->bridge;
> - bridge->funcs = &dp_bridge_ops;
> + bridge->funcs = (dp_display->connector_type == DRM_MODE_CONNECTOR_eDP) ?
> + &edp_bridge_ops : &dp_bridge_ops;
> bridge->encoder = encoder;
>
> rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
> index d4d31e5..5503c29 100644
> --- a/drivers/gpu/drm/msm/dp/dp_link.c
> +++ b/drivers/gpu/drm/msm/dp/dp_link.c
> @@ -924,6 +924,26 @@ static int dp_link_process_phy_test_pattern_request(
> return 0;
> }
>
> +static int dp_link_psr_status(struct dp_link_private *link)
> +{
> + u8 status[2];
> +
> + drm_dp_dpcd_read(link->aux, DP_PSR_ERROR_STATUS, status, 2);
> +
> + if (status[0] & DP_PSR_LINK_CRC_ERROR)
> + DRM_ERROR("PSR LINK CRC ERROR\n");
> + else if (status[0] & DP_PSR_RFB_STORAGE_ERROR)
> + DRM_ERROR("PSR RFB STORAGE ERROR\n");
> + else if (status[0] & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
> + DRM_ERROR("PSR VSC SDP UNCORRECTABLE ERROR\n");
> + else if (status[1] & DP_PSR_CAPS_CHANGE)
> + DRM_INFO("PSR Capability Change\n");

DRM_DEBUG_DP

> + else
> + return 0;
> +
> + return 1;
> +}
> +
> static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
> {
> return link_status[r - DP_LANE0_1_STATUS];
> @@ -1042,6 +1062,8 @@ 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_psr_status(link)) {
> + DRM_INFO("PSR IRQ_HPD received\n");

DRM_DEBUG_DP

> } 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 71db10c..e128d73 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -19,6 +19,26 @@ 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, 2);
> + if (rlen == 2) {
> + DRM_DEBUG_DP("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;
> @@ -104,6 +124,7 @@ 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 9023e5b..631657a 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..7a0b052 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 +178,9 @@
> #define MMSS_DP_AUDIO_TIMING_RBR_48 (0x00000094)
> #define MMSS_DP_AUDIO_TIMING_HBR_48 (0x00000098)
>
> +#define REG_PSR_CONFIG (0x00000100)
> +#define REG_PSR_CMD (0x00000110)
> +
> #define MMSS_DP_PSR_CRC_RG (0x00000154)
> #define MMSS_DP_PSR_CRC_B (0x00000158)
>
> @@ -184,6 +201,8 @@
> #define MMSS_DP_AUDIO_STREAM_0 (0x00000240)
> #define MMSS_DP_AUDIO_STREAM_1 (0x00000244)
>
> +#define MMSS_DP_SDP_CFG3 (0x0000024c)
> +
> #define MMSS_DP_EXTENSION_0 (0x00000250)
> #define MMSS_DP_EXTENSION_1 (0x00000254)
> #define MMSS_DP_EXTENSION_2 (0x00000258)
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index ae52412..254fd07 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -400,6 +400,8 @@ void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_displa
>
> void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor);
>
> +void msm_dp_display_set_psr(struct msm_dp *dp, bool enter);
> +
> #else
> static inline int __init msm_dp_register(void)
> {
> @@ -449,6 +451,10 @@ static inline void msm_dp_debugfs_init(struct msm_dp *dp_display,
> {
> }
>
> +static inline void msm_dp_display_set_psr(struct msm_dp *dp, bool enter)
> +{
> +}
> +
> #endif
>
> void __init msm_mdp_register(void);
> --
> 2.7.4
>

--
With best wishes
Dmitry