From: Peter Meerwald p.meerwald@bct-electronic.com
this patch addresses the issue that there is no DVI output on beagleboard-xm in u-boot; the TFP410 is not powered on, DVI_PUP needs to be set high
this is done differently on beagleboard-xm rev. B/C versus earlier boards: beagleboard-xm B/C need to set GPIO2 of the TWL4030 earlier boards need to set GPIO170
note that the change occured somewhere inbetween beagleboard-xm rev. A2 and A3
note that beagleboard-xm rev. A and rev. B cannot be distinguished using get_board_revision(), REVISION_XM_A/REVISION_XM_B is bogus
due to this glitch, the patch cannot work correctly on some beagleboard-xm rev A/B boards
tested on beagleboard-xm rev. C (you should see orange color on a monitor)
note that the framebuffer is NOT yet set up, this could be done along the lines below (for 800x480 resolution and RGB24) before calling omap3_dss_enable()
static void configure_frame_buffer() { writel(0x80500000, (uint *) 0x48050480); // address writel(0x80500000, (uint *) 0x48050484); writel(0x01df031f, (uint *) 0x4805048c); // size writel(0x00000091, (uint *) 0x480504a0); // RGB24 }
Signed-off-by: Peter Meerwald p.meerwald@bct-electronic.com
--- board/ti/beagle/beagle.c | 34 ++++++++++++++++++++++++++++++++++ 1 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/board/ti/beagle/beagle.c b/board/ti/beagle/beagle.c index 5c04b34..79f7f44 100644 --- a/board/ti/beagle/beagle.c +++ b/board/ti/beagle/beagle.c @@ -249,6 +249,38 @@ void beagle_display_init(void) }
/* + * Enable DVI power + */ +static void beagle_dvi_pup() { + uchar val; + + switch (get_board_revision()) { + case REVISION_AXBX: + case REVISION_CX: + case REVISION_C4: + case REVISION_XM_A: + gpio_request(170, ""); + gpio_direction_output(170, 0); + gpio_set_value(170, 1); + break; + case REVISION_XM_B: + case REVISION_XM_C: + default: + #define GPIODATADIR1 (TWL4030_BASEADD_GPIO+3) + #define GPIODATAOUT1 (TWL4030_BASEADD_GPIO+6) + + i2c_read(TWL4030_CHIP_GPIO, GPIODATADIR1, 1, &val, 1); + val |= 4; + i2c_write(TWL4030_CHIP_GPIO, GPIODATADIR1, 1, &val, 1); + + i2c_read(TWL4030_CHIP_GPIO, GPIODATAOUT1, 1, &val, 1); + val |= 4; + i2c_write(TWL4030_CHIP_GPIO, GPIODATAOUT1, 1, &val, 1); + break; + } +} + +/* * Routine: misc_init_r * Description: Configure board specific parts */ @@ -419,6 +451,8 @@ int misc_init_r(void) GPIO15 | GPIO14 | GPIO13 | GPIO12), &gpio5_base->oe);
dieid_num_r(); + + beagle_dvi_pup(); beagle_display_init(); omap3_dss_enable();