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drivers/i2c/ptn3460: Add early init option 

Create Kconfig options and boot state machine callback in ramstage for
an early initialization of the PTN3460 DP-to-LVDS bridge. This allows
showing the bootsplash screen on mainboards utilizing this chip during
the PCI device enumeration.

BUG=none
TEST=Select PTN3460_EARLY_INIT config switch in mainboard Kconfig and
check the log for "Attempting PTN3460 early init" message. If the
board (e.g. siemens/mc_apl7 in this case) is also configured for
showing the bootsplash logo, it should be now visible.

Change-Id: I5424d062b3fb63c78cfced3971376353be11c504
Signed-off-by: Jan Samek <jan.samek@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67681
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Uwe Poeche <uwe.poeche@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Jan Samek 2022-09-15 16:31:44 +02:00 committed by Paul Fagerburg
parent 514277f746
commit 669184434a
2 changed files with 52 additions and 0 deletions
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14
src/drivers/i2c/ptn3460/Kconfig
View File

@ -3,3 +3,17 @@ config DRIVERS_I2C_PTN3460
default n
help
Enable support for external display bridge (eDP to LVDS) PTN3460.
config PTN3460_EARLY_INIT
bool
default n
depends on DRIVERS_I2C_PTN3460
help
Enable early initialization of the PTN3460 DP-to-LVDS bridge
config PTN3460_EARLY_ADDR
hex
default 0x60
depends on PTN3460_EARLY_INIT
help
I2C address for early initialization of the PTN3460 DP-to-LVDS bridge

38
src/drivers/i2c/ptn3460/ptn3460.c
View File

@ -3,6 +3,7 @@
#include <console/console.h>
#include <device/i2c_bus.h>
#include <types.h>
#include <bootstate.h>
#include "ptn3460.h"
@ -65,6 +66,14 @@ static void ptn3460_init(struct device *dev)
uint8_t edid_data[PTN_EDID_LEN], edid_tab, *ptr = (uint8_t *) &cfg;
int i, val;
/* Guard against re-initialization of the device */
static bool init_done = false;
if (init_done) {
printk(BIOS_DEBUG, "Skipping PTN3460 init as it's already initialized\n");
return;
}
/* Mainboard provides EDID data. */
if (mb_get_edid(edid_data) != CB_SUCCESS) {
printk(BIOS_ERR, "PTN3460 error: Unable to get EDID data from mainboard.\n");
@ -109,6 +118,8 @@ static void ptn3460_init(struct device *dev)
}
}
}
init_done = true;
}
__weak enum cb_err mb_get_edid(uint8_t edid_data[0x80])
@ -139,3 +150,30 @@ struct chip_operations drivers_i2c_ptn3460_ops = {
CHIP_NAME("PTN3460")
.enable_dev = ptn3460_enable
};
#if CONFIG(PTN3460_EARLY_INIT)
/**
* \brief This function provides a callback for the boot state machine to initialize the
* PTN3460 DP-to-LVDS bridge before graphics initialization in order for the bootsplash
* logo to be shown.
* @param *unused Unused argument for the callback.
*/
static void ptn3460_early_init(void *unused)
{
struct device *ptn_dev;
printk(BIOS_DEBUG, "Attempting PTN3460 early init.\n");
ptn_dev = dev_find_slot_on_smbus(0, CONFIG_PTN3460_EARLY_ADDR);
if (!ptn_dev) {
printk(BIOS_ERR, "Failed to find the PTN3460 device!\n");
return;
}
ptn3460_init(ptn_dev);
}
BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_ENTRY, ptn3460_early_init, NULL);
#endif /* CONFIG(PTN3460_EARLY_INIT) */