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Groups > linux.kernel > #1229395

[PATCH v6 09/22] drm: Probe panels on demand

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When looking up a panel through its OF node, probe it if it hasn't
already.

The goal is to reduce deferred probes to a minimum, as it makes it very
cumbersome to find out why a device failed to probe, and can introduce
very big delays in when a critical device is probed.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---


 drivers/gpu/drm/drm_panel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index 2ef988e037b7..ad79a7b9c74d 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -23,6 +23,7 @@
 
 #include <linux/err.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_panel.h>
@@ -80,6 +81,8 @@ struct drm_panel *of_drm_find_panel(struct device_node *np)
 {
 	struct drm_panel *panel;
 
+	of_device_probe(np);
+
 	mutex_lock(&panel_lock);
 
 	list_for_each_entry(panel, &panel_list, list) {
-- 
2.4.3

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Thread

[PATCH v6 0/22] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 14/22] usb: phy: Probe phy devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 09/22] drm: Probe panels on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 12/22] pwm: Probe PWM chip devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 01/22] driver core: handle -EPROBE_DEFER from bus_type.match() Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 15/22] clk: Probe clk providers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 19/22] power-supply: Probe power supplies on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 20/22] driver core: Allow deferring probes until late init Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 16/22] pinctrl: Probe pinctrl devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 17/22] phy: core: Probe phy providers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 21/22] driver core: Start processing deferred probes earlier Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:10 +0200
  [PATCH v6 07/22] regulator: core: Remove regulator_list Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
    Re: [PATCH v6 07/22] regulator: core: Remove regulator_list Mark Brown <broonie@kernel.org> - 2015-09-21 21:40 +0200
      Re: [PATCH v6 07/22] regulator: core: Remove regulator_list Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-22 09:30 +0200
  [PATCH v6 02/22] ARM: amba: Move reading of periphid to amba_match() Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 04/22] of: add function to allow probing a device from a OF node Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 05/22] gpio: Probe GPIO drivers on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 11/22] i2c: core: Probe i2c adapters and devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200
  [PATCH v6 06/22] gpio: Probe pinctrl devices on demand Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-21 16:20 +0200

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