omap3: beaglexm: fix power on of DVI

TFP410 DVI chip is used to provide display out.
This chip is controlled by 2 lines:
LDO which supplies the power is controlled over gpio + 2
and the enable of the chip itself is done over gpio + 1
NOTE: the LDO is necessary for LED, serial blocks as well.

gpio + 1 was used to sense USB overcurrent in vanilla beagle.

Without this fix, the display would not function as the LDO
remains shut down.

[nm@ti.com: split up, added descriptive changelogs]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Koen Kooi <koen@beagleboard.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 39 insertions, 3 deletions

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 673deb9189fe..2ed804073f35 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -273,6 +273,8 @@ static struct gpio_led gpio_leds[];
 static int beagle_twl_gpio_setup(struct device *dev,
                 unsigned gpio, unsigned ngpio)
 {
+        int r;
+
         if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
                 mmc[0].gpio_wp = -EINVAL;
         } else if ((omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_C1_3) ||
@@ -293,9 +295,16 @@ static int beagle_twl_gpio_setup(struct device *dev,
         /* REVISIT: need ehci-omap hooks for external VBUS
          * power switch and overcurrent detect
          */
-
-        gpio_request(gpio + 1, "EHCI_nOC");
-        gpio_direction_input(gpio + 1);
+        if (omap3_beagle_get_rev() != OMAP3BEAGLE_BOARD_XM) {
+                r = gpio_request(gpio + 1, "EHCI_nOC");
+                if (!r) {
+                        r = gpio_direction_input(gpio + 1);
+                        if (r)
+                                gpio_free(gpio + 1);
+                }
+                if (r)
+                        pr_err("%s: unable to configure EHCI_nOC\n", __func__);
+        }
 
         /*
          * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
@@ -316,6 +325,33 @@ static int beagle_twl_gpio_setup(struct device *dev,
         /* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
         gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
 
+        /*
+         * gpio + 1 on Xm controls the TFP410's enable line (active low)
+         * gpio + 2 control varies depending on the board rev as follows:
+         * P7/P8 revisions(prototype): Camera EN
+         * A2+ revisions (production): LDO (supplies DVI, serial, led blocks)
+         */
+        if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
+                r = gpio_request(gpio + 1, "nDVI_PWR_EN");
+                if (!r) {
+                        r = gpio_direction_output(gpio + 1, 0);
+                        if (r)
+                                gpio_free(gpio + 1);
+                }
+                if (r)
+                        pr_err("%s: unable to configure nDVI_PWR_EN\n",
+                                __func__);
+                r = gpio_request(gpio + 2, "DVI_LDO_EN");
+                if (!r) {
+                        r = gpio_direction_output(gpio + 2, 1);
+                        if (r)
+                                gpio_free(gpio + 2);
+                }
+                if (r)
+                        pr_err("%s: unable to configure DVI_LDO_EN\n",
+                                __func__);
+        }
+
         return 0;
 }