77 lines
2.6 KiB
Diff
77 lines
2.6 KiB
Diff
From f17556101fcff8a54e52e6d88d24555308b9774f Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 20 May 2016 10:11:43 +0100
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Subject: [PATCH] mmc: Add card_quirks module parameter, log quirks
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Use mmc_block.card_quirks to override the quirks for all SD or MMC
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cards. The value is a bitfield using the bit positions defined in
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include/linux/mmc/card.h. If the module parameter is placed in the
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kernel command line (or bootargs) stored on the card then, assuming the
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device only has one SD card interface, the override effectively becomes
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card-specific.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/mmc/card/block.c | 28 +++++++++++++++++++++++++---
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1 file changed, 25 insertions(+), 3 deletions(-)
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--- a/drivers/mmc/card/block.c
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+++ b/drivers/mmc/card/block.c
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@@ -134,6 +134,13 @@ enum {
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module_param(perdev_minors, int, 0444);
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MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
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+/*
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+ * Allow quirks to be overridden for the current card
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+ */
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+static char *card_quirks;
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+module_param(card_quirks, charp, 0644);
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+MODULE_PARM_DESC(card_quirks, "Force the use of the indicated quirks (a bitfield)");
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+
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static inline int mmc_blk_part_switch(struct mmc_card *card,
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struct mmc_blk_data *md);
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static int get_card_status(struct mmc_card *card, u32 *status, int retries);
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@@ -2565,6 +2572,7 @@ static int mmc_blk_probe(struct mmc_card
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{
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struct mmc_blk_data *md, *part_md;
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char cap_str[10];
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+ char quirk_str[24];
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/*
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* Check that the card supports the command class(es) we need.
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@@ -2572,7 +2580,16 @@ static int mmc_blk_probe(struct mmc_card
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if (!(card->csd.cmdclass & CCC_BLOCK_READ))
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return -ENODEV;
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- mmc_fixup_device(card, blk_fixups);
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+ if (card_quirks) {
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+ unsigned long quirks;
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+ if (kstrtoul(card_quirks, 0, &quirks) == 0)
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+ card->quirks = (unsigned int)quirks;
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+ else
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+ pr_err("mmc_block: Invalid card_quirks parameter '%s'\n",
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+ card_quirks);
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+ }
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+ else
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+ mmc_fixup_device(card, blk_fixups);
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md = mmc_blk_alloc(card);
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if (IS_ERR(md))
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@@ -2580,9 +2597,14 @@ static int mmc_blk_probe(struct mmc_card
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string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
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cap_str, sizeof(cap_str));
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- pr_info("%s: %s %s %s %s\n",
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+ if (card->quirks)
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+ snprintf(quirk_str, sizeof(quirk_str),
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+ " (quirks 0x%08x)", card->quirks);
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+ else
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+ quirk_str[0] = '\0';
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+ pr_info("%s: %s %s %s%s%s\n",
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md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
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- cap_str, md->read_only ? "(ro)" : "");
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+ cap_str, md->read_only ? " (ro)" : "", quirk_str);
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if (mmc_blk_alloc_parts(card, md))
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goto out;
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