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-rw-r--r--recipes-kernel/linux/linux-ti33x-psp-3.2/beaglebone/0015-beaglebone-enable-PWM-for-lcd-backlight-backlight-is.patch177
1 files changed, 177 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-ti33x-psp-3.2/beaglebone/0015-beaglebone-enable-PWM-for-lcd-backlight-backlight-is.patch b/recipes-kernel/linux/linux-ti33x-psp-3.2/beaglebone/0015-beaglebone-enable-PWM-for-lcd-backlight-backlight-is.patch
new file mode 100644
index 00000000..b98a95cf
--- /dev/null
+++ b/recipes-kernel/linux/linux-ti33x-psp-3.2/beaglebone/0015-beaglebone-enable-PWM-for-lcd-backlight-backlight-is.patch
@@ -0,0 +1,177 @@
1From b1340250f872964ced2298fc4e0ae4d39469cf12 Mon Sep 17 00:00:00 2001
2From: Koen Kooi <koen@dominion.thruhere.net>
3Date: Tue, 31 Jan 2012 17:02:10 +0100
4Subject: [PATCH 15/22] beaglebone: enable PWM for lcd backlight <- backlight
5 is inverted
6
7Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
8---
9 arch/arm/mach-omap2/board-am335xevm.c | 54 +++++++++++++++++++++++++++------
10 arch/arm/mach-omap2/devices.c | 13 ++++++++
11 arch/arm/mach-omap2/devices.h | 1 +
12 3 files changed, 58 insertions(+), 10 deletions(-)
13
14diff --git a/arch/arm/mach-omap2/board-am335xevm.c b/arch/arm/mach-omap2/board-am335xevm.c
15index 177ab9e..6a77194 100644
16--- a/arch/arm/mach-omap2/board-am335xevm.c
17+++ b/arch/arm/mach-omap2/board-am335xevm.c
18@@ -36,6 +36,7 @@
19 #include <linux/mfd/tps65910.h>
20 #include <linux/mfd/tps65217.h>
21 #include <linux/pwm_backlight.h>
22+#include <linux/pwm/pwm.h>
23
24 /* LCD controller is similar to DA850 */
25 #include <video/da8xx-fb.h>
26@@ -131,7 +132,7 @@ static const struct display_panel disp_panel = {
27 /* LCD backlight platform Data */
28 #define AM335X_BACKLIGHT_MAX_BRIGHTNESS 100
29 #define AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS 100
30-#define AM335X_PWM_PERIOD_NANO_SECONDS (1000000 * 10)
31+#define AM335X_PWM_PERIOD_NANO_SECONDS (1000000 * 5)
32
33 #define PWM_DEVICE_ID "ecap.0"
34
35@@ -175,6 +176,16 @@ static const struct display_panel bbtoys7_panel = {
36 COLOR_ACTIVE,
37 };
38
39+#define BBTOYS7LCD_PWM_DEVICE_ID "ehrpwm.1:0"
40+
41+static struct platform_pwm_backlight_data bbtoys7lcd_backlight_data = {
42+ .pwm_id = BBTOYS7LCD_PWM_DEVICE_ID,
43+ .ch = -1,
44+ .max_brightness = AM335X_BACKLIGHT_MAX_BRIGHTNESS,
45+ .dft_brightness = AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS,
46+ .pwm_period_ns = AM335X_PWM_PERIOD_NANO_SECONDS,
47+};
48+
49 static struct lcd_ctrl_config bbtoys7_cfg = {
50 &bbtoys7_panel,
51 .ac_bias = 255,
52@@ -586,9 +597,9 @@ static struct pinmux_config bbtoys7_pin_mux[] = {
53 {"lcd_vsync.lcd_vsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
54 {"lcd_hsync.lcd_hsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
55 {"lcd_pclk.lcd_pclk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
56- {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
57- {"gpmc_a2.gpio1_18", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, // Backlight
58+ {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
59 {"ecap0_in_pwm0_out.gpio0_7", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, // AVDD_EN
60+ {"gpmc_a2.ehrpwm1A", OMAP_MUX_MODE6 | AM33XX_PIN_OUTPUT}, // Backlight
61 {NULL, 0},
62 };
63
64@@ -1121,6 +1132,7 @@ static struct pinmux_config ecap0_pin_mux[] = {
65 {NULL, 0},
66 };
67
68+static int ehrpwm_backlight_enable;
69 static int backlight_enable;
70
71 #define AM335XEVM_WLAN_PMENA_GPIO GPIO_TO_PIN(1, 30)
72@@ -1190,6 +1202,30 @@ static int __init ecap0_init(void)
73 }
74 late_initcall(ecap0_init);
75
76+static void enable_ehrpwm1(int evm_id, int profile)
77+{
78+ ehrpwm_backlight_enable = true;
79+}
80+
81+/* Setup pwm-backlight for bbtoys7lcd */
82+static struct platform_device bbtoys7lcd_backlight = {
83+ .name = "pwm-backlight",
84+ .id = -1,
85+ .dev = {
86+ .platform_data = &bbtoys7lcd_backlight_data,
87+ }
88+};
89+
90+static int __init ehrpwm1_init(void)
91+{
92+ int status = 0;
93+ if (ehrpwm_backlight_enable) {
94+ platform_device_register(&bbtoys7lcd_backlight);
95+ }
96+ return status;
97+}
98+late_initcall(ehrpwm1_init);
99+
100 static int __init conf_disp_pll(int rate)
101 {
102 struct clk *disp_pll;
103@@ -1224,11 +1260,12 @@ static void lcdc_init(int evm_id, int profile)
104 }
105
106 #define BEAGLEBONE_LCD_AVDD_EN GPIO_TO_PIN(0, 7)
107-#define BEAGLEBONE_LCD_BL GPIO_TO_PIN(1, 18)
108
109 static void bbtoys7lcd_init(int evm_id, int profile)
110 {
111 setup_pin_mux(bbtoys7_pin_mux);
112+ gpio_request(BEAGLEBONE_LCD_AVDD_EN, "BONE_LCD_AVDD_EN");
113+ gpio_direction_output(BEAGLEBONE_LCD_AVDD_EN, 1);
114
115 // we are being stupid and setting pixclock from here instead of da8xx-fb.c
116 if (conf_disp_pll(300000000)) {
117@@ -1239,12 +1276,7 @@ static void bbtoys7lcd_init(int evm_id, int profile)
118
119 if (am33xx_register_lcdc(&bbtoys7_pdata))
120 pr_info("Failed to register Beagleboardtoys 7\" LCD cape device\n");
121-
122- gpio_request(BEAGLEBONE_LCD_BL, "BONE_LCD_BL");
123- gpio_direction_output(BEAGLEBONE_LCD_BL, 1);
124- gpio_request(BEAGLEBONE_LCD_AVDD_EN, "BONE_LCD_AVDD_EN");
125- gpio_direction_output(BEAGLEBONE_LCD_AVDD_EN, 1);
126-
127+
128 return;
129 }
130
131@@ -1768,6 +1800,8 @@ static void beaglebone_cape_setup(struct memory_accessor *mem_acc, void *context
132 bbtoys7lcd_init(0,0);
133 pr_info("BeagleBone cape: initializing LCD cape touchscreen\n");
134 tsc_init(0,0);
135+ pr_info("BeagleBone cape: Registering PWM backlight for LCD cape\n");
136+ enable_ehrpwm1(0,0);
137 beaglebone_tsadcpins_free = 0;
138 }
139
140diff --git a/arch/arm/mach-omap2/devices.c b/arch/arm/mach-omap2/devices.c
141index 198df7b..8cd2523 100644
142--- a/arch/arm/mach-omap2/devices.c
143+++ b/arch/arm/mach-omap2/devices.c
144@@ -1278,6 +1278,19 @@ void register_ehrpwm(int max_freq)
145 platform_device_register(&am335x_epwm2_device);
146 }
147
148+void register_ehrpwm1(int max_freq)
149+{
150+ int val;
151+
152+ val = __raw_readw(AM33XX_CTRL_REGADDR(AM33XX_PWMSS_CTRL));
153+ val |= PWMSS1_TBCLKEN;
154+ __raw_writew(val, AM33XX_CTRL_REGADDR(AM33XX_PWMSS_CTRL));
155+ am335x_pwmss_config1.chan_attrib[1].max_freq = max_freq;
156+ sema_init(&am335x_pwmss_config1.config_semaphore, 1);
157+ am335x_pwmss_config1.version = PWM_VERSION_1;
158+ platform_device_register(&am335x_epwm1_device);
159+}
160+
161 static struct resource am335x_ecap0_resurce[] = {
162 {
163 .start = AM33XX_EPWMSS0_BASE ,
164diff --git a/arch/arm/mach-omap2/devices.h b/arch/arm/mach-omap2/devices.h
165index e086839..5161eb4 100644
166--- a/arch/arm/mach-omap2/devices.h
167+++ b/arch/arm/mach-omap2/devices.h
168@@ -18,5 +18,6 @@ int omap3_init_camera(struct isp_platform_data *pdata);
169
170 void __init am335x_register_mcasp1(struct snd_platform_data *pdata);
171 extern void register_ehrpwm(int max_freq);
172+extern void register_ehrpwm1(int max_freq);
173
174 #endif
175--
1761.7.9.4
177
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