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Revision 72741084d903e65e121c27bd29494d941729d4a1 authored by Ulf Hansson on 27 August 2019, 08:10:43 UTC, committed by Ulf Hansson on 30 August 2019, 07:17:53 UTC 
mmc: core: Fix init of SD cards reporting an invalid VDD range
 
The OCR register defines the supported range of VDD voltages for SD cards.
However, it has turned out that some SD cards reports an invalid voltage
range, for example having bit7 set.

When a host supports MMC_CAP2_FULL_PWR_CYCLE and some of the voltages from
the invalid VDD range, this triggers the core to run a power cycle of the
card to try to initialize it at the lowest common supported voltage.
Obviously this fails, since the card can't support it.

Let's fix this problem, by clearing invalid bits from the read OCR register
for SD cards, before proceeding with the VDD voltage negotiation.

Cc: stable@vger.kernel.org
Reported-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Philip Langdale <philipl@overt.org>
Tested-by: Philip Langdale <philipl@overt.org>
Tested-by: Manuel Presnitz <mail@mpy.de>
1 parent 7871aa6
Raw File
Kconfig 
# SPDX-License-Identifier: GPL-2.0-only
config EXT2_FS
	tristate "Second extended fs support"
	help
	  Ext2 is a standard Linux file system for hard disks.

	  To compile this file system support as a module, choose M here: the
	  module will be called ext2.

	  If unsure, say Y.

config EXT2_FS_XATTR
	bool "Ext2 extended attributes"
	depends on EXT2_FS
	help
	  Extended attributes are name:value pairs associated with inodes by
	  the kernel or by users (see the attr(5) manual page for details).

	  If unsure, say N.

config EXT2_FS_POSIX_ACL
	bool "Ext2 POSIX Access Control Lists"
	depends on EXT2_FS_XATTR
	select FS_POSIX_ACL
	help
	  Posix Access Control Lists (ACLs) support permissions for users and
	  groups beyond the owner/group/world scheme.

	  If you don't know what Access Control Lists are, say N

config EXT2_FS_SECURITY
	bool "Ext2 Security Labels"
	depends on EXT2_FS_XATTR
	help
	  Security labels support alternative access control models
	  implemented by security modules like SELinux.  This option
	  enables an extended attribute handler for file security
	  labels in the ext2 filesystem.

	  If you are not using a security module that requires using
	  extended attributes for file security labels, say N.
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