cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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psb_intel_modes.c (1175B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2007 Intel Corporation
      4 *
      5 * Authers: Jesse Barnes <jesse.barnes@intel.com>
      6 */
      7
      8#include <linux/i2c.h>
      9
     10#include "psb_intel_drv.h"
     11
     12/**
     13 * psb_intel_ddc_probe
     14 * @adapter:   Associated I2C adaptor
     15 */
     16bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
     17{
     18	u8 out_buf[] = { 0x0, 0x0 };
     19	u8 buf[2];
     20	int ret;
     21	struct i2c_msg msgs[] = {
     22		{
     23		 .addr = 0x50,
     24		 .flags = 0,
     25		 .len = 1,
     26		 .buf = out_buf,
     27		 },
     28		{
     29		 .addr = 0x50,
     30		 .flags = I2C_M_RD,
     31		 .len = 1,
     32		 .buf = buf,
     33		 }
     34	};
     35
     36	ret = i2c_transfer(adapter, msgs, 2);
     37	if (ret == 2)
     38		return true;
     39
     40	return false;
     41}
     42
     43/**
     44 * psb_intel_ddc_get_modes - get modelist from monitor
     45 * @connector: DRM connector device to use
     46 * @adapter:   Associated I2C adaptor
     47 *
     48 * Fetch the EDID information from @connector using the DDC bus.
     49 */
     50int psb_intel_ddc_get_modes(struct drm_connector *connector,
     51			    struct i2c_adapter *adapter)
     52{
     53	struct edid *edid;
     54	int ret = 0;
     55
     56	edid = drm_get_edid(connector, adapter);
     57	if (edid) {
     58		drm_connector_update_edid_property(connector, edid);
     59		ret = drm_add_edid_modes(connector, edid);
     60		kfree(edid);
     61	}
     62	return ret;
     63}