Thread (11 messages) 11 messages, 3 authors, 2014-02-05

[PATCH 2/2] ARM: tegra: paz00: Add LVDS support to device tree

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From: marvin24@gmx.de (Marc Dietrich)
Date: 2013-12-21 22:11:58
Also in: linux-tegra 

Sorry, Stephen, I mistyped your email address in the first post.

On Saturday 21 December 2013 21:38:13 Marc Dietrich wrote:
Add backlight and panel nodes for the PAZ00 TFT LCD panel.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
---
This should enable everything needed. Unfortunately, in my tests it only
switches on the backlight, but the display controller blocks in some
infinit loop, so we get no output (and no working system). I post it here
in case I missed something obvious...
In fact it turns out to be some heisenbug because in one out of ten tries it 
actually works. The other nine cases it prints:

[    1.995067] rfkill_gpio rfkill_gpio: wifi_rfkill device registered.
[    2.001459] Registering SWP/SWPB emulation handler
[    2.011632] [drm:drm_get_minor], 
[    2.016473] [drm:drm_get_minor], new minor assigned 64
[    2.021648] [drm:drm_get_minor], 
[    2.026319] [drm:drm_get_minor], new minor assigned 0
[    2.033465] [drm:drm_sysfs_connector_add], adding "HDMI-A-1" to sysfs
[    2.040402] [drm:drm_sysfs_hotplug_event], generating hotplug event
[    2.048115] [drm:drm_sysfs_connector_add], adding "LVDS-1" to sysfs
[    2.054642] [drm:drm_sysfs_hotplug_event], generating hotplug event
[    2.061341] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    2.068027] [drm] No driver support for vblank timestamp query.
[    2.094947] random: nonblocking pool is initialized
[  240.885976] INFO: task swapper/0:1 blocked for more than 120 seconds.
[  240.892462]       Not tainted 3.13.0-rc4-next-20131220-00003-gbcf12ec #11
[  240.900030] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
[  240.907997] swapper/0       D c05653b8     0     1      0 0x00000000
[  240.914457] [<c05653b8>] (__schedule) from [<c0564bcc>] 
(schedule_timeout+0x174/0x1ec)
[  240.922512] [<c0564bcc>] (schedule_timeout) from [<c056603c>] 
(wait_for_common+0xb0/0x144)
[  240.930913] [<c056603c>] (wait_for_common) from [<c0038db8>] 
(flush_workqueue+0xec/0x570)
[  240.939227] [<c0038db8>] (flush_workqueue) from [<c02b7048>] 
(deferred_probe_initcall+0x50/0x80)
[  240.948143] [<c02b7048>] (deferred_probe_initcall) from [<c00089f4>] 
(do_one_initcall+0xe4/0x140)
[  240.957179] [<c00089f4>] (do_one_initcall) from [<c0784be8>] 
(kernel_init_freeable+0xfc/0x1c8)
[  240.965936] [<c0784be8>] (kernel_init_freeable) from [<c055eb94>] 
(kernel_init+0x8/0x118)
[  240.974180] [<c055eb94>] (kernel_init) from [<c000e678>] 
(ret_from_fork+0x14/0x3c)
[  261.904891] INFO: rcu_preempt self-detected stall on CPU { 0}  (t=2100 
jiffies g=4294967023 c=4294967022 q=1)
[  261.914827] CPU: 0 PID: 55 Comm: kworker/u4:2 Not tainted 3.13.0-rc4-
next-20131220-00003-gbcf12ec #11
[  261.924042] Workqueue: deferwq deferred_probe_work_func
[  261.929285] [<c0015b2c>] (unwind_backtrace) from [<c00117e0>] 
(show_stack+0x10/0x14)
[  261.937036] [<c00117e0>] (show_stack) from [<c0563180>] 
(dump_stack+0x80/0xcc)
[  261.944261] [<c0563180>] (dump_stack) from [<c006ce00>] 
(rcu_check_callbacks+0x408/0x850)
[  261.952442] [<c006ce00>] (rcu_check_callbacks) from [<c002fbe0>] 
(update_process_times+0x38/0x58)
[  261.961312] [<c002fbe0>] (update_process_times) from [<c0076894>] 
(tick_sched_timer+0x44/0x74)
[  261.969929] [<c0076894>] (tick_sched_timer) from [<c00422a4>] 
(__run_hrtimer.isra.15+0x58/0x114)
[  261.978711] [<c00422a4>] (__run_hrtimer.isra.15) from [<c0042bd0>] 
(hrtimer_interrupt+0xfc/0x288)
[  261.987579] [<c0042bd0>] (hrtimer_interrupt) from [<c001509c>] 
(twd_handler+0x2c/0x40)
[  261.995500] [<c001509c>] (twd_handler) from [<c006719c>] 
(handle_percpu_devid_irq+0x68/0x84)
[  262.003935] [<c006719c>] (handle_percpu_devid_irq) from [<c0063b14>] 
(generic_handle_irq+0x20/0x30)
[  262.012977] [<c0063b14>] (generic_handle_irq) from [<c000ee94>] 
(handle_IRQ+0x38/0x94)
[  262.020890] [<c000ee94>] (handle_IRQ) from [<c0008698>] 
(gic_handle_irq+0x28/0x5c)
[  262.028456] [<c0008698>] (gic_handle_irq) from [<c0012300>] 
(__irq_svc+0x40/0x70)
[  262.035931] Exception stack(0xdb29bc98 to 0xdb29bce0)
[  262.040974] bc80:                                                       
c0814780 00000000
[  262.049145] bca0: ffff8ba1 00000000 00000002 0000001d 00000000 db29a000 
00000002 c07c6080
[  262.057316] bcc0: 00000000 db860000 00000000 db29bce0 c0029898 c0029914 
20000113 ffffffff
[  262.065500] [<c0012300>] (__irq_svc) from [<c0029914>] 
(__do_softirq+0x8c/0x208)
[  262.072895] [<c0029914>] (__do_softirq) from [<c0029dd0>] 
(irq_exit+0xa0/0xec)
[  262.080115] [<c0029dd0>] (irq_exit) from [<c000ee98>] 
(handle_IRQ+0x3c/0x94)
[  262.087158] [<c000ee98>] (handle_IRQ) from [<c0008698>] 
(gic_handle_irq+0x28/0x5c)
[  262.094723] [<c0008698>] (gic_handle_irq) from [<c0012300>] 
(__irq_svc+0x40/0x70)
[  262.102197] Exception stack(0xdb29bd50 to 0xdb29bd98)
[  262.107243] bd40:                                     c0814114 a0000113 
00000000 e0a00000
[  262.115413] bd60: db2f9410 c07cc3d0 00000020 db2f9810 00000002 00000000 
00000000 db860000
[  262.123582] bd80: 00000000 db29bd98 c02a3b6c c02a3b84 60000113 ffffffff
[  262.130198] [<c0012300>] (__irq_svc) from [<c02a3b84>] 
(tegra_output_rgb_disable+0x58/0xe0)
[  262.138548] [<c02a3b84>] (tegra_output_rgb_disable) from [<c02a360c>] 
(tegra_encoder_dpms+0x68/0xc0)
[  262.147675] [<c02a360c>] (tegra_encoder_dpms) from [<c02808ac>] 
(drm_encoder_disable+0x64/0x68)
[  262.156370] [<c02808ac>] (drm_encoder_disable) from [<c02809b8>] 
(drm_helper_disable_unused_functions+0x108/0x134)
[  262.166713] [<c02809b8>] (drm_helper_disable_unused_functions) from 
[<c029f5dc>] (tegra_drm_fb_init+0x88/0x110)
[  262.176794] [<c029f5dc>] (tegra_drm_fb_init) from [<c029e32c>] 
(tegra_drm_load+0x94/0xc0)
[  262.184977] [<c029e32c>] (tegra_drm_load) from [<c028c904>] 
(drm_dev_register+0x70/0x130)
[  262.193151] [<c028c904>] (drm_dev_register) from [<c029df14>] 
(drm_host1x_init+0x2c/0x88)
[  262.201328] [<c029df14>] (drm_host1x_init) from [<c02ab7b0>] 
(host1x_subdev_register+0xb4/0xd0)
[  262.210024] [<c02ab7b0>] (host1x_subdev_register) from [<c02abf00>] 
(host1x_client_register+0xf4/0x11c)
[  262.219412] [<c02abf00>] (host1x_client_register) from [<c02a21ec>] 
(tegra_dc_probe+0x118/0x1ec)
[  262.228196] [<c02a21ec>] (tegra_dc_probe) from [<c02b86d4>] 
(platform_drv_probe+0x18/0x48)
[  262.236457] [<c02b86d4>] (platform_drv_probe) from [<c02b7334>] 
(driver_probe_device+0x118/0x234)
[  262.245334] [<c02b7334>] (driver_probe_device) from [<c02b5a6c>] 
(bus_for_each_drv+0x44/0x8c)
[  262.253855] [<c02b5a6c>] (bus_for_each_drv) from [<c02b71e4>] 
(device_attach+0x70/0x88)
[  262.261854] [<c02b71e4>] (device_attach) from [<c02b68ec>] 
(bus_probe_device+0x84/0xa8)
[  262.269853] [<c02b68ec>] (bus_probe_device) from [<c02b6cdc>] 
(deferred_probe_work_func+0x60/0x8c)
[  262.278808] [<c02b6cdc>] (deferred_probe_work_func) from [<c0039da4>] 
(process_one_work+0xfc/0x350)
[  262.287850] [<c0039da4>] (process_one_work) from [<c003a3fc>] 
(worker_thread+0x13c/0x384)
[  262.296022] [<c003a3fc>] (worker_thread) from [<c003facc>] 
(kthread+0xc4/0xe0)
[  262.303242] [<c003facc>] (kthread) from [<c000e678>] 
(ret_from_fork+0x14/0x3c)


Marc
quoted hunk ↗ jump to hunk
 arch/arm/boot/dts/tegra20-paz00.dts |   46
++++++++++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1
deletion(-)

diff --git a/arch/arm/boot/dts/tegra20-paz00.dts
b/arch/arm/boot/dts/tegra20-paz00.dts index c7cd8e6..9a39a80 100644
--- a/arch/arm/boot/dts/tegra20-paz00.dts
+++ b/arch/arm/boot/dts/tegra20-paz00.dts
@@ -17,6 +17,14 @@
 	};

 	host1x at 50000000 {
+		dc at 54200000 {
+			rgb {
+				status = "okay";
+
+				nvidia,panel = <&panel>;
+			};
+		};
+
 		hdmi at 54280000 {
 			status = "okay";

@@ -257,7 +265,11 @@
 		status = "okay";
 	};

-	i2c at 7000c000 {
+	pwm: pwm at 7000a000 {
+		status = "okay";
+	};
+
+	lvds_ddc: i2c at 7000c000 {
 		status = "okay";
 		clock-frequency = <400000>;

@@ -475,6 +487,18 @@
 		non-removable;
 	};

+	backlight: backlight {
+		compatible = "pwm-backlight";
+
+		enable-gpios = <&gpio TEGRA_GPIO(U, 4) GPIO_ACTIVE_HIGH>;
+		pwms = <&pwm 0 5000000>;
+
+		brightness-levels = <0 16 32 48 64 80 96 112 128 144 160 176 192 208 
224
quoted hunk ↗ jump to hunk
240 255>; +		default-brightness-level = <10>;
+
+		backlight-boot-off;
+	};
+
 	clocks {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -509,6 +533,16 @@
 		};
 	};

+	panel: panel {
+		compatible = "samsung,ltn101nt05", "simple-panel";
+
+		ddc-i2c-bus = <&lvds_ddc>;
+		power-supply = <&vdd_pnl_reg>;
+		enable-gpios = <&gpio TEGRA_GPIO(M, 6) GPIO_ACTIVE_HIGH>;
+
+		backlight = <&backlight>;
+	};
+
 	regulators {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -522,6 +556,16 @@
 			regulator-max-microvolt = <5000000>;
 			regulator-always-on;
 		};
+
+		vdd_pnl_reg: regulator at 1 {
+			compatible = "regulator-fixed";
+			reg = <1>;
+			regulator-name = "+3VS,vdd_pnl";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			gpio = <&gpio TEGRA_GPIO(A, 4) GPIO_ACTIVE_HIGH>;
+			enable-active-high;
+		};
 	};

 	sound {
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