GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mb/siemens/mc_ehl3: Add PTN3460 eDP-to-LVDS bridge 

This board contains in addition to its base variant, mc_ehl2,
an LCD panel driven through the PTN3460 eDP-to-LVDS bridge.

This patch enables the PTN3460 support by adding the device to
devicetree.cb and board-specific configuration parameters in
lcd_panel.c, based upon a similar implementation in siemens/mc_apl7.

BUG=none
TEST=Boot with the LCD panel attached and observe whether
the picture is stable and free of artifacts coming from wrong
resolution, timing etc.

Change-Id: Ib8a1a6f47053406e42554c2dd33684165d54be08
Signed-off-by: Jan Samek <jan.samek@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70692
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
This commit is contained in:
Jan Samek 2022-12-02 12:44:24 +01:00 committed by Felix Held
parent c5625c53c4
commit d6244534de
4 changed files with 100 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/mainboard/siemens/mc_ehl/variants/mc_ehl3/Kconfig
View File

@ -2,6 +2,7 @@ if BOARD_SIEMENS_MC_EHL3
config BOARD_SPECIFIC_OPTIONS
def_bool y
select DRIVERS_I2C_PTN3460
select DRIVERS_I2C_RV3028C7
select DRIVER_INTEL_I210
select SOC_INTEL_COMMON_BLOCK_LPC_COMB_ENABLE

1
src/mainboard/siemens/mc_ehl/variants/mc_ehl3/Makefile.inc
View File

@ -3,4 +3,5 @@
bootblock-y += gpio.c
romstage-y += memory.c
ramstage-y += gpio.c
ramstage-y += lcd_panel.c
ramstage-y += mainboard.c

6
src/mainboard/siemens/mc_ehl/variants/mc_ehl3/devicetree.cb
View File

@ -163,7 +163,11 @@ chip soc/intel/elkhartlake
end
end
device pci 15.2 on # I2C2
# Add dummy I2C device to limit BUS speed to 100 kHz in OS
# Enable external display bridge (eDP to LVDS)
chip drivers/i2c/ptn3460
device i2c 0x20 on end # PTN3460 DP2LVDS Bridge
end
# Add dummy I2C device to limit BUS speed to 100 kHz in OS
chip drivers/i2c/generic
register "hid" = ""PRP0001""
register "speed" = "I2C_SPEED_STANDARD"

93
src/mainboard/siemens/mc_ehl/variants/mc_ehl3/lcd_panel.c Normal file
View File

@ -0,0 +1,93 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/device.h>
#include <drivers/i2c/ptn3460/ptn3460.h>
#include <hwilib.h>
#include <types.h>
/** \brief This function provides EDID data to the driver for DP2LVDS Bridge (PTN3460)
* @param edid_data pointer to EDID data in driver
*/
enum cb_err mb_get_edid(uint8_t edid_data[0x80])
{
const char *hwi_block = "hwinfo.hex";
if (hwilib_find_blocks(hwi_block) != CB_SUCCESS) {
printk(BIOS_ERR, "LCD: Info block \"%s\" not found!\n", hwi_block);
return CB_ERR;
}
/* Get EDID data from hwinfo block */
if (hwilib_get_field(Edid, edid_data, PTN_EDID_LEN) != PTN_EDID_LEN) {
printk(BIOS_ERR, "LCD: No EDID data available in %s\n", hwi_block);
return CB_ERR;
}
return CB_SUCCESS;
}
/** \brief This function provides EDID block [0..6] to the driver for DP2LVDS Bridge (PTN3460)
* which has to be used.
*/
uint8_t mb_select_edid_table(void)
{
return 6; /* With this mainboard we use EDID block 6 for emulation in PTN3460. */
}
/** \brief Function to enable mainboard to adjust the config data of PTN3460.
* @param *cfg_ptr Pointer to the PTN config structure to modify.
* @return -1 on error; PTN_CFG_MODIFIED if data was modified and needs to be updated.
*/
int mb_adjust_cfg(struct ptn_3460_config *cfg)
{
const char *hwi_block = "hwinfo.hex";
uint8_t disp_con = 0, color_depth = 0;
/* Get display-specific configuration from hwinfo. */
if (hwilib_find_blocks(hwi_block) != CB_SUCCESS) {
printk(BIOS_ERR, "LCD: Info block \"%s\" not found!\n", hwi_block);
return -1;
}
if (hwilib_get_field(PF_DisplCon, &disp_con, sizeof(disp_con)) != sizeof(disp_con)) {
printk(BIOS_ERR, "LCD: Missing panel features from %s\n", hwi_block);
return -1;
}
if (hwilib_get_field(PF_Color_Depth, &color_depth,
sizeof(color_depth)) != sizeof(color_depth)) {
printk(BIOS_ERR, "LCD: Missing panel features from %s\n", hwi_block);
return -1;
}
/* Set up configuration data according to the hwinfo block we got. */
cfg->dp_interface_ctrl = 0x00;
/* Use odd-bus for clock distribution only. */
cfg->lvds_interface_ctrl1 = 0x01;
if (disp_con == PF_DISPLCON_LVDS_DUAL) {
/* Turn on dual LVDS lane and clock. */
cfg->lvds_interface_ctrl1 |= 0x0b;
}
if (color_depth == PF_COLOR_DEPTH_6BIT) {
/* Use 18 bits per pixel. */
cfg->lvds_interface_ctrl1 |= 0x20;
}
/* Set up remaining board-specific LVDS parameters: */
/* No clock spreading, 300 mV LVDS swing. */
cfg->lvds_interface_ctrl2 = 0x03;
/* No lane/channel swapping */
cfg->lvds_interface_ctrl3 = 0x00;
/* Enable VDD to LVDS active delay (16 ms). */
cfg->t2_delay = 0x01;
/* LVDS to backlight active delay: 200 ms. */
cfg->t3_timing = 0x04;
/* Minimum re-power delay: 500 ms */
cfg->t12_timing = 0x0a;
/* Backlight off to LVDS inactive delay: 200 ms. */
cfg->t4_timing = 0x04;
/* Enable LVDS to VDD inactive delay. */
cfg->t5_delay = 0x01;
/* Enable backlight control. */
cfg->backlight_ctrl = 0x00;
return PTN_CFG_MODIFIED;
}