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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
internal.h 
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* RomFS internal definitions
 *
 * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/romfs_fs.h>

struct romfs_inode_info {
	struct inode	vfs_inode;
	unsigned long	i_metasize;	/* size of non-data area */
	unsigned long	i_dataoffset;	/* from the start of fs */
};

static inline size_t romfs_maxsize(struct super_block *sb)
{
	return (size_t) (unsigned long) sb->s_fs_info;
}

static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
{
	return container_of(inode, struct romfs_inode_info, vfs_inode);
}

/*
 * mmap-nommu.c
 */
#if !defined(CONFIG_MMU) && defined(CONFIG_ROMFS_ON_MTD)
extern const struct file_operations romfs_ro_fops;
#else
#define romfs_ro_fops	generic_ro_fops
#endif

/*
 * storage.c
 */
extern int romfs_dev_read(struct super_block *sb, unsigned long pos,
			  void *buf, size_t buflen);
extern ssize_t romfs_dev_strnlen(struct super_block *sb,
				 unsigned long pos, size_t maxlen);
extern int romfs_dev_strcmp(struct super_block *sb, unsigned long pos,
			    const char *str, size_t size);
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