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Read EDID data on Beagleboard and pass it to omapfb driver if found.

This commit is contained in:
jmcneill 2013-01-01 23:21:26 +00:00
parent 39c8eada8e
commit 63e40cb108
1 changed files with 50 additions and 2 deletions
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52
sys/arch/evbarm/beagle/beagle_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: beagle_machdep.c,v 1.32 2012/12/31 13:20:16 jmcneill Exp $ */
/* $NetBSD: beagle_machdep.c,v 1.33 2013/01/01 23:21:26 jmcneill Exp $ */
/*
* Machine dependent functions for kernel setup for TI OSK5912 board.
@ -125,7 +125,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: beagle_machdep.c,v 1.32 2012/12/31 13:20:16 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: beagle_machdep.c,v 1.33 2013/01/01 23:21:26 jmcneill Exp $");
#include "opt_machdep.h"
#include "opt_ddb.h"
@ -181,6 +181,9 @@ __KERNEL_RCSID(0, "$NetBSD: beagle_machdep.c,v 1.32 2012/12/31 13:20:16 jmcneill
#include <evbarm/include/autoconf.h>
#include <evbarm/beagle/beagle.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/ddcreg.h>
#include "prcm.h"
#include "omapwdt32k.h"
@ -195,6 +198,8 @@ static char beagle_default_boot_args[] = DEFAULT_BOOT_ARGS;
char *boot_args = beagle_default_boot_args;
char *boot_file = NULL;
static uint8_t beagle_edid[128]; /* EDID storage */
u_int uboot_args[4] = { 0 }; /* filled in by beagle_start.S (not in bss) */
/* Same things, but for the free (unused by the kernel) memory. */
@ -681,6 +686,40 @@ omap3530_memprobe(void)
}
#endif
/*
* EDID can be read from DVI-D (HDMI) port on BeagleBoard from
* If EDID data is present, this function fills in the supplied edid_buf
* and returns true. Otherwise, it returns false and the contents of the
* buffer are undefined.
*/
static bool
beagle_read_edid(uint8_t *edid_buf, size_t edid_buflen)
{
i2c_tag_t ic = NULL;
uint8_t reg;
int error;
#if defined(OMAP_3530)
/* On Beagleboard, EDID is accessed using I2C2 ("omapiic2"). */
extern i2c_tag_t omap3_i2c_get_tag(device_t);
ic = omap3_i2c_get_tag(device_find_by_xname("omapiic2"));
#endif
if (ic == NULL)
return false;
iic_acquire_bus(ic, 0);
for (reg = DDC_EDID_START; reg < edid_buflen; reg++) {
error = iic_exec(ic, I2C_OP_READ_WITH_STOP, DDC_ADDR,
&reg, sizeof(reg), &edid_buf[reg], 1, 0);
if (error)
break;
}
iic_release_bus(ic, 0);
return error == 0 ? true : false;
}
void
beagle_device_register(device_t self, void *aux)
{
@ -737,4 +776,13 @@ beagle_device_register(device_t self, void *aux)
#endif
return;
}
if (device_is_a(self, "omapfb")) {
if (beagle_read_edid(beagle_edid, sizeof(beagle_edid))) {
prop_dictionary_set(dict, "EDID",
prop_data_create_data(beagle_edid,
sizeof(beagle_edid)));
}
return;
}
}