cb3745c407
Add backlight support in ps8640 through the AUX channel using eDP DPCD registers. BUG=b:202966352 BRANCH=trogdor TEST=verified firmware screen works on homestar rev4 Change-Id: Ief1bf56c89c8215427dcbddfc67e8bcd4c3607d2 Signed-off-by: xuxinxiong <xuxinxiong@huaqin.corp-partner.google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/58624 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _DP_AUX_H_
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#define _DP_AUX_H_
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#include <types.h>
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enum {
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EDID_LENGTH = 128,
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EDID_I2C_ADDR = 0x50,
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EDID_EXTENSION_FLAG = 0x7e,
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};
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enum i2c_over_aux {
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I2C_OVER_AUX_WRITE_MOT_0 = 0x0,
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I2C_OVER_AUX_READ_MOT_0 = 0x1,
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I2C_OVER_AUX_WRITE_STATUS_UPDATE_0 = 0x2,
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I2C_OVER_AUX_WRITE_MOT_1 = 0x4,
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I2C_OVER_AUX_READ_MOT_1 = 0x5,
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I2C_OVER_AUX_WRITE_STATUS_UPDATE_1 = 0x6,
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NATIVE_AUX_WRITE = 0x8,
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NATIVE_AUX_READ = 0x9,
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};
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enum aux_request {
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DPCD_READ,
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DPCD_WRITE,
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I2C_RAW_READ,
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I2C_RAW_WRITE,
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I2C_RAW_READ_AND_STOP,
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I2C_RAW_WRITE_AND_STOP,
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};
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/* Backlight configuration */
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#define DP_BACKLIGHT_MODE_SET 0x721
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#define DP_BACKLIGHT_CONTROL_MODE_MASK 0x3
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#define DP_BACKLIGHT_CONTROL_MODE_DPCD 0x2
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#define DP_DISPLAY_CONTROL_REGISTER 0x720
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#define DP_BACKLIGHT_ENABLE 0x1
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#define DP_BACKLIGHT_BRIGHTNESS_MSB 0x722
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#define DP_AUX_MAX_PAYLOAD_BYTES 16
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bool dp_aux_request_is_write(enum aux_request request);
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enum i2c_over_aux dp_get_aux_cmd(enum aux_request request, uint32_t remaining_after_this);
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#endif
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