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Message-ID: <CAA8EJpqPXoFX4LXyXYgfh07Vpxg-KgD8VBR6x5bXf4GOJmbOtw@mail.gmail.com>
Date: Sat, 16 Sep 2023 04:21:44 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc: dri-devel@...ts.freedesktop.org, robdclark@...il.com,
sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
agross@...nel.org, andersson@...nel.org, quic_abhinavk@...cinc.com,
quic_jesszhan@...cinc.com, quic_sbillaka@...cinc.com,
marijn.suijten@...ainline.org, freedreno@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/7] drm/msm/dp: add pm_runtime_force_suspend()/resume()
On Sat, 16 Sept 2023 at 00:38, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
>
> Add pm_runtime_force_suspend()/resume() to complete incorporating pm
> runtime framework into DP driver. Both dp_pm_prepare() and dp_pm_complete()
> are added to set hpd_state to correct state. After resume, DP driver will
> re training its main link after .hpd_enable() callback enabled HPD
> interrupts and bring up display accordingly.
How will it re-train the main link? What is the code path for that?
I think this is a misuse for prepare/complete callbacks, at least
judging from their documentation.
>
> Changes in v3:
> -- replace dp_pm_suspend() with pm_runtime_force_suspend()
> -- replace dp_pm_resume() with pm_runtime_force_resume()
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
> drivers/gpu/drm/msm/dp/dp_display.c | 87 +++++--------------------------------
> 1 file changed, 10 insertions(+), 77 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index b6992202..b58cb02 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1333,101 +1333,35 @@ static int dp_pm_runtime_resume(struct device *dev)
> return 0;
> }
>
> -static int dp_pm_resume(struct device *dev)
> +static void dp_pm_complete(struct device *dev)
> {
> - struct platform_device *pdev = to_platform_device(dev);
> - struct msm_dp *dp_display = platform_get_drvdata(pdev);
> - struct dp_display_private *dp;
> - int sink_count = 0;
> -
> - dp = container_of(dp_display, struct dp_display_private, dp_display);
> + struct dp_display_private *dp = dev_get_dp_display_private(dev);
>
> mutex_lock(&dp->event_mutex);
>
> drm_dbg_dp(dp->drm_dev,
> - "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> + "type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> dp->dp_display.connector_type, dp->core_initialized,
> - dp->phy_initialized, dp_display->power_on);
> + dp->phy_initialized, dp->dp_display.power_on);
>
> /* start from disconnected state */
> dp->hpd_state = ST_DISCONNECTED;
>
> - /* turn on dp ctrl/phy */
> - dp_display_host_init(dp);
> -
> - if (dp_display->is_edp)
> - dp_catalog_ctrl_hpd_enable(dp->catalog);
> -
> - if (dp_catalog_link_is_connected(dp->catalog)) {
> - /*
> - * set sink to normal operation mode -- D0
> - * before dpcd read
> - */
> - dp_display_host_phy_init(dp);
> - dp_link_psm_config(dp->link, &dp->panel->link_info, false);
> - sink_count = drm_dp_read_sink_count(dp->aux);
> - if (sink_count < 0)
> - sink_count = 0;
> -
> - dp_display_host_phy_exit(dp);
> - }
> -
> - dp->link->sink_count = sink_count;
> - /*
> - * can not declared display is connected unless
> - * HDMI cable is plugged in and sink_count of
> - * dongle become 1
> - * also only signal audio when disconnected
> - */
> - if (dp->link->sink_count) {
> - dp->dp_display.link_ready = true;
> - } else {
> - dp->dp_display.link_ready = false;
> - dp_display_handle_plugged_change(dp_display, false);
> - }
> -
> - drm_dbg_dp(dp->drm_dev,
> - "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
> - dp->dp_display.connector_type, dp->link->sink_count,
> - dp->dp_display.link_ready, dp->core_initialized,
> - dp->phy_initialized, dp_display->power_on);
> -
> mutex_unlock(&dp->event_mutex);
> -
> - return 0;
> }
>
> -static int dp_pm_suspend(struct device *dev)
> +static int dp_pm_prepare(struct device *dev)
> {
> - struct platform_device *pdev = to_platform_device(dev);
> - struct msm_dp *dp_display = platform_get_drvdata(pdev);
> - struct dp_display_private *dp;
> -
> - dp = container_of(dp_display, struct dp_display_private, dp_display);
> + struct dp_display_private *dp = dev_get_dp_display_private(dev);
>
> mutex_lock(&dp->event_mutex);
>
> - drm_dbg_dp(dp->drm_dev,
> - "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> - dp->dp_display.connector_type, dp->core_initialized,
> - dp->phy_initialized, dp_display->power_on);
> -
> /* mainlink enabled */
> if (dp_power_clk_status(dp->power, DP_CTRL_PM))
> dp_ctrl_off_link_stream(dp->ctrl);
>
> - dp_display_host_phy_exit(dp);
> -
> - /* host_init will be called at pm_resume */
> - dp_display_host_deinit(dp);
> -
> dp->hpd_state = ST_SUSPENDED;
>
> - drm_dbg_dp(dp->drm_dev,
> - "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> - dp->dp_display.connector_type, dp->core_initialized,
> - dp->phy_initialized, dp_display->power_on);
> -
> mutex_unlock(&dp->event_mutex);
>
> return 0;
> @@ -1435,8 +1369,10 @@ static int dp_pm_suspend(struct device *dev)
>
> static const struct dev_pm_ops dp_pm_ops = {
> SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
> - .suspend = dp_pm_suspend,
> - .resume = dp_pm_resume,
> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> + pm_runtime_force_resume)
> + .prepare = dp_pm_prepare,
> + .complete = dp_pm_complete,
> };
>
> static struct platform_driver dp_display_driver = {
> @@ -1670,9 +1606,6 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
>
> dp_display = container_of(dp, struct dp_display_private, dp_display);
>
> - if (dp->is_edp)
> - dp_hpd_unplug_handle(dp_display, 0);
> -
> mutex_lock(&dp_display->event_mutex);
>
> state = dp_display->hpd_state;
> --
> 2.7.4
>
--
With best wishes
Dmitry
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