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>

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 673deb9..2ed8040 100644 (file)
--- 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;
 }