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Adrian Hunter ab45b45e7c mmc: sdhci-pci: Fix eMMC driver strength for BYT-based controllers 
commit 1a8eb6b373c2af6533c13d1ea11f504e5010ed9a upstream.

BIOS writers have begun the practice of setting 40 ohm eMMC driver strength
even though the eMMC may not support it, on the assumption that the kernel
will validate the value against the eMMC (Extended CSD DRIVER_STRENGTH
[offset 197]) and revert to the default 50 ohm value if 40 ohm is invalid.

This is done to avoid changing the value for different boards.

Putting aside the merits of this approach, it is clear the eMMC's mask
of supported driver strengths is more reliable than the value provided
by BIOS. Add validation accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: 51ced59cc02e ("mmc: sdhci-pci: Use ACPI DSM to get driver strength for some Intel devices")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200422111629.4899-1-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-16 16:27:18 +08:00
Documentation USB: hub: Revert commit bd0e6c9614b9 ("usb: hub: try old enumeration scheme first for high speed devices") 2021-03-16 16:26:56 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch arm64: Delete the space separator in __emit_inst 2021-03-16 16:27:14 +08:00
block blk-mq: Put driver tag in blk_mq_dispatch_rq_list() when no budget 2021-03-16 16:27:15 +08:00
certs Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
crypto crypto: rng - Fix a refcounting bug in crypto_rng_reset() 2021-03-16 16:26:09 +08:00
drivers mmc: sdhci-pci: Fix eMMC driver strength for BYT-based controllers 2021-03-16 16:27:18 +08:00
fs btrfs: transaction: Avoid deadlock due to bad initialization timing of fs_info::journal_info 2021-03-16 16:27:18 +08:00
include NFSv4.1: fix handling of backchannel binding in BIND_CONN_TO_SESSION 2021-03-16 16:27:17 +08:00
init printk: queue wake_up_klogd irq_work only if per-CPU areas are ready 2021-03-16 16:27:05 +08:00
ipc ipc/util.c: sysvipc_find_ipc() should increase position index 2021-03-16 16:26:46 +08:00
kernel signal: check sig before setting info in kill_pid_usb_asyncio 2021-03-16 16:27:12 +08:00
lib lib/raid6/test: fix build on distros whose /bin/sh is not bash 2021-03-16 16:26:46 +08:00
mm mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path 2021-03-16 16:27:12 +08:00
net net: use indirect call wrappers for skb_copy_datagram_iter() 2021-03-16 16:27:16 +08:00
package config/arm64: OPEN CONFIG_PSI and phytium configs 2021-03-16 11:02:59 +08:00
samples vmalloc: fix remap_vmalloc_range() bounds checks 2021-03-16 16:26:56 +08:00
scripts kbuild: fix DT binding schema rule again to avoid needless rebuilds 2021-03-16 16:27:06 +08:00
security KEYS: Avoid false positive ENOMEM error on key read 2021-03-16 16:26:53 +08:00
sound Revert "ASoC: meson: axg-card: fix codec-to-codec link setup" 2021-03-16 16:27:16 +08:00
tools objtool: Support Clang non-section symbols in ORC dump 2021-03-16 16:27:14 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0