From: Douglas Anderson <dianders@chromium.org> To: Andrzej Hajda <a.hajda@samsung.com>, Neil Armstrong <narmstrong@baylibre.com>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@siol.net>, Sam Ravnborg <sam@ravnborg.org> Cc: Linus W <linus.walleij@linaro.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, robdclark@chromium.org, Stephen Boyd <swboyd@chromium.org>, Steev Klimaszewski <steev@kali.org>, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, linux-arm-msm@vger.kernel.org, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>, Douglas Anderson <dianders@chromium.org>, Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>, Thierry Reding <thierry.reding@gmail.com>, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 12/12] drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare Date: Fri, 2 Apr 2021 15:28:46 -0700 [thread overview] Message-ID: <20210402152701.v3.12.I9e8bd33b49c496745bfac58ea9ab418bd3b6f5ce@changeid> (raw) In-Reply-To: <20210402222846.2461042-1-dianders@chromium.org> Unpreparing and re-preparing a panel can be a really heavy operation. Panels datasheets often specify something on the order of 500ms as the delay you should insert after turning off the panel before turning it on again. In addition, turning on a panel can have delays on the order of 100ms - 200ms before the panel will assert HPD (AKA "panel ready"). The above means that we should avoid turning a panel off if we're going to turn it on again shortly. The above becomes a problem when we want to read the EDID of a panel. The way that ordering works is that userspace wants to read the EDID of the panel _before_ fully enabling it so that it can set the initial mode correctly. However, we can't read the EDID until we power it up. This leads to code that does this dance (like ps8640_bridge_get_edid()): 1. When userspace requests EDID / the panel modes (through an ioctl), we power on the panel just enough to read the EDID and then power it off. 2. Userspace then turns the panel on. There's likely not much time between step #1 and #2 and so we want to avoid powering the panel off and on again between those two steps. Let's use Runtime PM to help us. We'll move the existing prepare() and unprepare() to be runtime resume() and runtime suspend(). Now when we want to prepare() or unprepare() we just increment or decrement the refcount. We'll default to a 1 second autosuspend delay which seems sane given the typical delays we see for panels. A few notes: - It seems the existing unprepare() and prepare() are defined to be no-ops if called extra times. We'll preserve that behavior. - This is a slight change in the ABI of simple panel. If something was absolutely relying on the unprepare() to happen instantly that simply won't be the case anymore. I'm not aware of anyone relying on that behavior, but if there is someone then we'll need to figure out how to enable (or disable) this new delayed behavior selectively. - In order for this to work we now have a hard dependency on "PM". From memory this is a legit thing to assume these days and we don't have to find some fallback to keep working if someone wants to build their system without "PM". Signed-off-by: Douglas Anderson <dianders@chromium.org> --- (no changes since v1) drivers/gpu/drm/panel/Kconfig | 1 + drivers/gpu/drm/panel/panel-simple.c | 93 +++++++++++++++++++++------- 2 files changed, 73 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index 4894913936e9..ef87d92cdf49 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -80,6 +80,7 @@ config DRM_PANEL_SIMPLE tristate "support for simple panels" depends on OF depends on BACKLIGHT_CLASS_DEVICE + depends on PM select VIDEOMODE_HELPERS help DRM panel driver for dumb panels that need at most a regulator and diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index be312b5c04dd..6b22872b3281 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -27,6 +27,7 @@ #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <video/display_timing.h> @@ -175,6 +176,8 @@ struct panel_simple { bool enabled; bool no_hpd; + bool prepared; + ktime_t prepared_time; ktime_t unprepared_time; @@ -334,19 +337,31 @@ static int panel_simple_disable(struct drm_panel *panel) return 0; } +static int panel_simple_suspend(struct device *dev) +{ + struct panel_simple *p = dev_get_drvdata(dev); + + gpiod_set_value_cansleep(p->enable_gpio, 0); + regulator_disable(p->supply); + p->unprepared_time = ktime_get(); + + return 0; +} + static int panel_simple_unprepare(struct drm_panel *panel) { struct panel_simple *p = to_panel_simple(panel); + int ret; - if (p->prepared_time == 0) + /* Unpreparing when already unprepared is a no-op */ + if (!p->prepared) return 0; - gpiod_set_value_cansleep(p->enable_gpio, 0); - - regulator_disable(p->supply); - - p->prepared_time = 0; - p->unprepared_time = ktime_get(); + pm_runtime_mark_last_busy(panel->dev); + ret = pm_runtime_put_autosuspend(panel->dev); + if (ret < 0) + return ret; + p->prepared = false; return 0; } @@ -376,22 +391,19 @@ static int panel_simple_get_hpd_gpio(struct device *dev, return 0; } -static int panel_simple_prepare_once(struct drm_panel *panel) +static int panel_simple_prepare_once(struct panel_simple *p) { - struct panel_simple *p = to_panel_simple(panel); + struct device *dev = p->base.dev; unsigned int delay; int err; int hpd_asserted; unsigned long hpd_wait_us; - if (p->prepared_time != 0) - return 0; - panel_simple_wait(p->unprepared_time, p->desc->delay.unprepare); err = regulator_enable(p->supply); if (err < 0) { - dev_err(panel->dev, "failed to enable supply: %d\n", err); + dev_err(dev, "failed to enable supply: %d\n", err); return err; } @@ -405,7 +417,7 @@ static int panel_simple_prepare_once(struct drm_panel *panel) if (p->hpd_gpio) { if (IS_ERR(p->hpd_gpio)) { - err = panel_simple_get_hpd_gpio(panel->dev, p, false); + err = panel_simple_get_hpd_gpio(dev, p, false); if (err) goto error; } @@ -423,7 +435,7 @@ static int panel_simple_prepare_once(struct drm_panel *panel) if (err) { if (err != -ETIMEDOUT) - dev_err(panel->dev, + dev_err(dev, "error waiting for hpd GPIO: %d\n", err); goto error; } @@ -447,25 +459,46 @@ static int panel_simple_prepare_once(struct drm_panel *panel) */ #define MAX_PANEL_PREPARE_TRIES 5 -static int panel_simple_prepare(struct drm_panel *panel) +static int panel_simple_resume(struct device *dev) { + struct panel_simple *p = dev_get_drvdata(dev); int ret; int try; for (try = 0; try < MAX_PANEL_PREPARE_TRIES; try++) { - ret = panel_simple_prepare_once(panel); + ret = panel_simple_prepare_once(p); if (ret != -ETIMEDOUT) break; } if (ret == -ETIMEDOUT) - dev_err(panel->dev, "Prepare timeout after %d tries\n", try); + dev_err(dev, "Prepare timeout after %d tries\n", try); else if (try) - dev_warn(panel->dev, "Prepare needed %d retries\n", try); + dev_warn(dev, "Prepare needed %d retries\n", try); return ret; } +static int panel_simple_prepare(struct drm_panel *panel) +{ + struct panel_simple *p = to_panel_simple(panel); + int ret; + + /* Preparing when already prepared is a no-op */ + if (p->prepared) + return 0; + + ret = pm_runtime_get_sync(panel->dev); + if (ret < 0) { + pm_runtime_put_autosuspend(panel->dev); + return ret; + } + + p->prepared = true; + + return 0; +} + static int panel_simple_enable(struct drm_panel *panel) { struct panel_simple *p = to_panel_simple(panel); @@ -748,6 +781,18 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) break; } + dev_set_drvdata(dev, panel); + + /* + * We use runtime PM for prepare / unprepare since those power the panel + * on and off and those can be very slow operations. This is important + * to optimize powering the panel on briefly to read the EDID before + * fully enabling the panel. + */ + pm_runtime_enable(dev); + pm_runtime_set_autosuspend_delay(dev, 1000); + pm_runtime_use_autosuspend(dev); + drm_panel_init(&panel->base, dev, &panel_simple_funcs, connector_type); err = drm_panel_of_backlight(&panel->base); @@ -756,8 +801,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) drm_panel_add(&panel->base); - dev_set_drvdata(dev, panel); - return 0; free_ddc: @@ -4603,10 +4646,17 @@ static void panel_simple_platform_shutdown(struct platform_device *pdev) panel_simple_shutdown(&pdev->dev); } +static const struct dev_pm_ops panel_simple_pm_ops = { + SET_RUNTIME_PM_OPS(panel_simple_suspend, panel_simple_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) +}; + static struct platform_driver panel_simple_platform_driver = { .driver = { .name = "panel-simple", .of_match_table = platform_of_match, + .pm = &panel_simple_pm_ops, }, .probe = panel_simple_platform_probe, .remove = panel_simple_platform_remove, @@ -4901,6 +4951,7 @@ static struct mipi_dsi_driver panel_simple_dsi_driver = { .driver = { .name = "panel-simple-dsi", .of_match_table = dsi_of_match, + .pm = &panel_simple_pm_ops, }, .probe = panel_simple_dsi_probe, .remove = panel_simple_dsi_remove, -- 2.31.0.208.g409f899ff0-goog
WARNING: multiple messages have this Message-ID (diff)
From: Douglas Anderson <dianders@chromium.org> To: Andrzej Hajda <a.hajda@samsung.com>, Neil Armstrong <narmstrong@baylibre.com>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@siol.net>, Sam Ravnborg <sam@ravnborg.org> Cc: robdclark@chromium.org, David Airlie <airlied@linux.ie>, linux-arm-msm@vger.kernel.org, Douglas Anderson <dianders@chromium.org>, Steev Klimaszewski <steev@kali.org>, Stephen Boyd <swboyd@chromium.org>, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>, Thierry Reding <thierry.reding@gmail.com>, dri-devel@lists.freedesktop.org, Bjorn Andersson <bjorn.andersson@linaro.org>, linux-kernel@vger.kernel.org Subject: [PATCH v3 12/12] drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare Date: Fri, 2 Apr 2021 15:28:46 -0700 [thread overview] Message-ID: <20210402152701.v3.12.I9e8bd33b49c496745bfac58ea9ab418bd3b6f5ce@changeid> (raw) In-Reply-To: <20210402222846.2461042-1-dianders@chromium.org> Unpreparing and re-preparing a panel can be a really heavy operation. Panels datasheets often specify something on the order of 500ms as the delay you should insert after turning off the panel before turning it on again. In addition, turning on a panel can have delays on the order of 100ms - 200ms before the panel will assert HPD (AKA "panel ready"). The above means that we should avoid turning a panel off if we're going to turn it on again shortly. The above becomes a problem when we want to read the EDID of a panel. The way that ordering works is that userspace wants to read the EDID of the panel _before_ fully enabling it so that it can set the initial mode correctly. However, we can't read the EDID until we power it up. This leads to code that does this dance (like ps8640_bridge_get_edid()): 1. When userspace requests EDID / the panel modes (through an ioctl), we power on the panel just enough to read the EDID and then power it off. 2. Userspace then turns the panel on. There's likely not much time between step #1 and #2 and so we want to avoid powering the panel off and on again between those two steps. Let's use Runtime PM to help us. We'll move the existing prepare() and unprepare() to be runtime resume() and runtime suspend(). Now when we want to prepare() or unprepare() we just increment or decrement the refcount. We'll default to a 1 second autosuspend delay which seems sane given the typical delays we see for panels. A few notes: - It seems the existing unprepare() and prepare() are defined to be no-ops if called extra times. We'll preserve that behavior. - This is a slight change in the ABI of simple panel. If something was absolutely relying on the unprepare() to happen instantly that simply won't be the case anymore. I'm not aware of anyone relying on that behavior, but if there is someone then we'll need to figure out how to enable (or disable) this new delayed behavior selectively. - In order for this to work we now have a hard dependency on "PM". From memory this is a legit thing to assume these days and we don't have to find some fallback to keep working if someone wants to build their system without "PM". Signed-off-by: Douglas Anderson <dianders@chromium.org> --- (no changes since v1) drivers/gpu/drm/panel/Kconfig | 1 + drivers/gpu/drm/panel/panel-simple.c | 93 +++++++++++++++++++++------- 2 files changed, 73 insertions(+), 21 deletions(-) diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index 4894913936e9..ef87d92cdf49 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -80,6 +80,7 @@ config DRM_PANEL_SIMPLE tristate "support for simple panels" depends on OF depends on BACKLIGHT_CLASS_DEVICE + depends on PM select VIDEOMODE_HELPERS help DRM panel driver for dumb panels that need at most a regulator and diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index be312b5c04dd..6b22872b3281 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -27,6 +27,7 @@ #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <video/display_timing.h> @@ -175,6 +176,8 @@ struct panel_simple { bool enabled; bool no_hpd; + bool prepared; + ktime_t prepared_time; ktime_t unprepared_time; @@ -334,19 +337,31 @@ static int panel_simple_disable(struct drm_panel *panel) return 0; } +static int panel_simple_suspend(struct device *dev) +{ + struct panel_simple *p = dev_get_drvdata(dev); + + gpiod_set_value_cansleep(p->enable_gpio, 0); + regulator_disable(p->supply); + p->unprepared_time = ktime_get(); + + return 0; +} + static int panel_simple_unprepare(struct drm_panel *panel) { struct panel_simple *p = to_panel_simple(panel); + int ret; - if (p->prepared_time == 0) + /* Unpreparing when already unprepared is a no-op */ + if (!p->prepared) return 0; - gpiod_set_value_cansleep(p->enable_gpio, 0); - - regulator_disable(p->supply); - - p->prepared_time = 0; - p->unprepared_time = ktime_get(); + pm_runtime_mark_last_busy(panel->dev); + ret = pm_runtime_put_autosuspend(panel->dev); + if (ret < 0) + return ret; + p->prepared = false; return 0; } @@ -376,22 +391,19 @@ static int panel_simple_get_hpd_gpio(struct device *dev, return 0; } -static int panel_simple_prepare_once(struct drm_panel *panel) +static int panel_simple_prepare_once(struct panel_simple *p) { - struct panel_simple *p = to_panel_simple(panel); + struct device *dev = p->base.dev; unsigned int delay; int err; int hpd_asserted; unsigned long hpd_wait_us; - if (p->prepared_time != 0) - return 0; - panel_simple_wait(p->unprepared_time, p->desc->delay.unprepare); err = regulator_enable(p->supply); if (err < 0) { - dev_err(panel->dev, "failed to enable supply: %d\n", err); + dev_err(dev, "failed to enable supply: %d\n", err); return err; } @@ -405,7 +417,7 @@ static int panel_simple_prepare_once(struct drm_panel *panel) if (p->hpd_gpio) { if (IS_ERR(p->hpd_gpio)) { - err = panel_simple_get_hpd_gpio(panel->dev, p, false); + err = panel_simple_get_hpd_gpio(dev, p, false); if (err) goto error; } @@ -423,7 +435,7 @@ static int panel_simple_prepare_once(struct drm_panel *panel) if (err) { if (err != -ETIMEDOUT) - dev_err(panel->dev, + dev_err(dev, "error waiting for hpd GPIO: %d\n", err); goto error; } @@ -447,25 +459,46 @@ static int panel_simple_prepare_once(struct drm_panel *panel) */ #define MAX_PANEL_PREPARE_TRIES 5 -static int panel_simple_prepare(struct drm_panel *panel) +static int panel_simple_resume(struct device *dev) { + struct panel_simple *p = dev_get_drvdata(dev); int ret; int try; for (try = 0; try < MAX_PANEL_PREPARE_TRIES; try++) { - ret = panel_simple_prepare_once(panel); + ret = panel_simple_prepare_once(p); if (ret != -ETIMEDOUT) break; } if (ret == -ETIMEDOUT) - dev_err(panel->dev, "Prepare timeout after %d tries\n", try); + dev_err(dev, "Prepare timeout after %d tries\n", try); else if (try) - dev_warn(panel->dev, "Prepare needed %d retries\n", try); + dev_warn(dev, "Prepare needed %d retries\n", try); return ret; } +static int panel_simple_prepare(struct drm_panel *panel) +{ + struct panel_simple *p = to_panel_simple(panel); + int ret; + + /* Preparing when already prepared is a no-op */ + if (p->prepared) + return 0; + + ret = pm_runtime_get_sync(panel->dev); + if (ret < 0) { + pm_runtime_put_autosuspend(panel->dev); + return ret; + } + + p->prepared = true; + + return 0; +} + static int panel_simple_enable(struct drm_panel *panel) { struct panel_simple *p = to_panel_simple(panel); @@ -748,6 +781,18 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) break; } + dev_set_drvdata(dev, panel); + + /* + * We use runtime PM for prepare / unprepare since those power the panel + * on and off and those can be very slow operations. This is important + * to optimize powering the panel on briefly to read the EDID before + * fully enabling the panel. + */ + pm_runtime_enable(dev); + pm_runtime_set_autosuspend_delay(dev, 1000); + pm_runtime_use_autosuspend(dev); + drm_panel_init(&panel->base, dev, &panel_simple_funcs, connector_type); err = drm_panel_of_backlight(&panel->base); @@ -756,8 +801,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) drm_panel_add(&panel->base); - dev_set_drvdata(dev, panel); - return 0; free_ddc: @@ -4603,10 +4646,17 @@ static void panel_simple_platform_shutdown(struct platform_device *pdev) panel_simple_shutdown(&pdev->dev); } +static const struct dev_pm_ops panel_simple_pm_ops = { + SET_RUNTIME_PM_OPS(panel_simple_suspend, panel_simple_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) +}; + static struct platform_driver panel_simple_platform_driver = { .driver = { .name = "panel-simple", .of_match_table = platform_of_match, + .pm = &panel_simple_pm_ops, }, .probe = panel_simple_platform_probe, .remove = panel_simple_platform_remove, @@ -4901,6 +4951,7 @@ static struct mipi_dsi_driver panel_simple_dsi_driver = { .driver = { .name = "panel-simple-dsi", .of_match_table = dsi_of_match, + .pm = &panel_simple_pm_ops, }, .probe = panel_simple_dsi_probe, .remove = panel_simple_dsi_remove, -- 2.31.0.208.g409f899ff0-goog _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2021-04-02 22:29 UTC|newest] Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-02 22:28 [PATCH v3 00/12] drm: Fix EDID reading on ti-sn65dsi86 Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 01/12] drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:49 ` Laurent Pinchart 2021-04-05 0:49 ` Laurent Pinchart 2021-04-15 1:19 ` Doug Anderson 2021-04-15 1:19 ` Doug Anderson 2021-04-15 1:56 ` Laurent Pinchart 2021-04-15 1:56 ` Laurent Pinchart 2021-04-15 14:48 ` Doug Anderson 2021-04-15 14:48 ` Doug Anderson 2021-04-02 22:28 ` [PATCH v3 02/12] drm/bridge: ti-sn65dsi86: Simplify refclk handling Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 03/12] drm/bridge: ti-sn65dsi86: Remove incorrectly tagged kerneldoc comment Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:50 ` Laurent Pinchart 2021-04-05 0:50 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 04/12] drm/bridge: ti-sn65dsi86: Reorder remove() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:52 ` Laurent Pinchart 2021-04-05 0:52 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 05/12] drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post_disable() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:58 ` Laurent Pinchart 2021-04-05 0:58 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 06/12] drm/bridge: ti-sn65dsi86: Get rid of the useless detect() function Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:58 ` Laurent Pinchart 2021-04-05 0:58 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 07/12] drm/bridge: ti-sn65dsi86: Remove extra call: drm_connector_update_edid_property() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 1:01 ` Laurent Pinchart 2021-04-05 1:01 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 08/12] drm/bridge: ti-sn65dsi86: Power things properly for reading the EDID Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 09/12] drm/bridge: ti-sn65dsi86: Fail aux transfers right away if not powered Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 10/12] drm/bridge: ti-sn65dsi86: Read the EDID only if refclk was provided Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 1:04 ` Laurent Pinchart 2021-04-05 1:04 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 11/12] drm/bridge: ti-sn65dsi86: Print an error if we fallback to panel modes Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 1:04 ` Laurent Pinchart 2021-04-05 1:04 ` Laurent Pinchart 2021-04-02 22:28 ` Douglas Anderson [this message] 2021-04-02 22:28 ` [PATCH v3 12/12] drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare Douglas Anderson 2021-04-15 0:58 ` Laurent Pinchart 2021-04-15 0:58 ` Laurent Pinchart 2021-04-15 1:22 ` Doug Anderson 2021-04-15 1:22 ` Doug Anderson 2021-04-15 1:30 ` Laurent Pinchart 2021-04-15 1:30 ` Laurent Pinchart
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