drm/amd/display: Add disconnect case on dongle check - kernel

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author	Jingwen Zhu <[email protected]>	2025-05-08 03:19:49 +0000
committer	Alex Deucher <[email protected]>	2025-06-03 19:35:40 +0000
commit	35b74eccf8289e4a458133be9f9795d152b6f11e (patch)
tree	404da7b2b99ab094f0aa9dd71bcfdb1f967268d5 /drivers/usb/core/endpoint.c
parent	drm/amd/display: Avoid trying AUX transactions on disconnected ports (diff)
download	kernel-35b74eccf8289e4a458133be9f9795d152b6f11e.tar.gz kernel-35b74eccf8289e4a458133be9f9795d152b6f11e.zip

drm/amd/display: Add disconnect case on dongle check

[why] In the case of an external monitor disconnection, the kernel mode will attempt to post new timing validation with two path counts (eDP + external monitor removed to virtual). [how] Skip validating color depth and pixel encoding in the scenario involving a DP to HDMI active converter dongle. Reviewed-by: Wenjing Liu <[email protected]> Signed-off-by: Jingwen Zhu <[email protected]> Signed-off-by: Wayne Lin <[email protected]> Tested-by: Daniel Wheeler <[email protected]> Signed-off-by: Alex Deucher <[email protected]>

Diffstat (limited to 'drivers/usb/core/endpoint.c')

0 files changed, 0 insertions, 0 deletions

// SPDX-License-Identifier: GPL-2.0 /* * Copyright IBM Corp. 2019 * Author(s): Thomas Richter <tmricht@linux.ibm.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License (version 2 only) * as published by the Free Software Foundation. * * Architecture specific trace_event function. Save event's bc000 raw data * to file. File name is aux.ctr.## where ## stands for the CPU number the * sample was taken from. */ #include <unistd.h> #include <stdio.h> #include <string.h> #include <inttypes.h> #include <sys/stat.h> #include <linux/compiler.h> #include <asm/byteorder.h> #include "debug.h" #include "session.h" #include "evlist.h" #include "color.h" #include "sample-raw.h" #include "s390-cpumcf-kernel.h" #include "util/pmu.h" #include "util/sample.h" static size_t ctrset_size(struct cf_ctrset_entry *set) { return sizeof(*set) + set->ctr * sizeof(u64); } static bool ctrset_valid(struct cf_ctrset_entry *set) { return set->def == S390_CPUMCF_DIAG_DEF; } /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte * aligned and might have trailing padding bytes. * Display the raw data on screen. */ static bool s390_cpumcfdg_testctr(struct perf_sample *sample) { size_t len = sample->raw_size, offset = 0; unsigned char *buf = sample->raw_data; struct cf_trailer_entry *te; struct cf_ctrset_entry *cep, ce; while (offset < len) { cep = (struct cf_ctrset_entry *)(buf + offset); ce.def = be16_to_cpu(cep->def); ce.set = be16_to_cpu(cep->set); ce.ctr = be16_to_cpu(cep->ctr); ce.res1 = be16_to_cpu(cep->res1); if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) { /* Raw data for counter sets are always multiple of 8 * bytes. Prepending a 4 bytes size field to the * raw data block in the sample causes the perf tool * to append 4 padding bytes to make the raw data part * of the sample a multiple of eight bytes again. * * If the last entry (trailer) is 4 bytes off the raw * area data end, all is good. */ if (len - offset - sizeof(*te) == 4) break; pr_err("Invalid counter set entry at %zd\n", offset); return false; } offset += ctrset_size(&ce); } return true; } /* Dump event bc000 on screen, already tested on correctness. */ static void s390_cpumcfdg_dumptrail(const char *color, size_t offset,


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