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Revision 5d1d150d7d775db1dccb4dc4676075d456dea392 authored by Doug Anderson on 28 August 2014, 23:43:48 UTC, committed by Mark Brown on 29 August 2014, 11:07:38 UTC 
spi/rockchip: Avoid accidentally turning off the clock
 
If our client is requesting a clock that is above the maximum clock
then the following division will result in 0:
  rs->max_freq / rs->speed

We'll then program 0 into the SPI_BAUDR register.  The Rockchip TRM
says: "If the value is 0, the serial output clock (sclk_out) is
disabled."

It's much better to end up with the fastest possible clock rather than
a clock that is off, so enforce a minimum value.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 parent 0ac7a49
Raw File
hash.c 
/*
 * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <crypto/hash.h>
#include <linux/err.h>
#include "hash.h"

static struct crypto_shash *tfm;

int __init btrfs_hash_init(void)
{
	tfm = crypto_alloc_shash("crc32c", 0, 0);
	if (IS_ERR(tfm))
		return PTR_ERR(tfm);

	return 0;
}

void btrfs_hash_exit(void)
{
	crypto_free_shash(tfm);
}

u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
{
	struct {
		struct shash_desc shash;
		char ctx[crypto_shash_descsize(tfm)];
	} desc;
	int err;

	desc.shash.tfm = tfm;
	desc.shash.flags = 0;
	*(u32 *)desc.ctx = crc;

	err = crypto_shash_update(&desc.shash, address, length);
	BUG_ON(err);

	return *(u32 *)desc.ctx;
}
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