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