2011/11/28 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>:
> Without CRC support the mmc spi driver fails to compile with
> the following:
>
> drivers/mci/mci_spi.c:74:18: error: static declaration of 'crc7' follows non-static declaration
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> ---
> drivers/mci/mci_spi.c | 29 ++++++++++++-----------------
> 1 files changed, 12 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/mci/mci_spi.c b/drivers/mci/mci_spi.c
> index 124e49b..653910b 100644
> --- a/drivers/mci/mci_spi.c
> +++ b/drivers/mci/mci_spi.c
> @@ -64,23 +64,6 @@
> #define RTOUT 3000000 /* 1 sec */
> #define WTOUT 3000000 /* 1 sec */
>
> -#ifndef CONFIG_MMC_SPI_CRC_ON
> -/* Note that while the CRC, in general, is ignored in SPI mode, the very first
> - * command must be followed by a valid CRC, since the card is not yet in SPI mode.
> - * The CRC byte for a CMD0 command with a zero argument is a constant 0x4A. For
> - * simplicity, this CRC byte is always sent with every command.
> - */
> -
> -static inline u8 crc7(u8 crc, const u8 *buffer, size_t len)
> -{
> - /* This is the crc7 value for a CMD0 command with a zero argument.
> - * It'll be left shifted and ored with '1' in mmc_spi_command_send
> - * to give 0x95 (also known as the CMD0 constant CRC value...)
> - */
> - return 0x4A;
> -}
> -#endif
> -
> struct mmc_spi_host {
> struct mci_host mci;
> struct spi_device *spi;
> @@ -141,6 +124,14 @@ mmc_spi_writebytes(struct mmc_spi_host *host, unsigned len, void *data)
> return status;
> }
>
> +/*
> + * Note that while the CRC, in general, is ignored in SPI mode, the very first
> + * command must be followed by a valid CRC, since the card is not yet in SPI mode.
> + * The CRC byte for a CMD0 command with a zero argument is a constant 0x4A. For
> + * simplicity, this CRC byte is always sent with every command.
> + */
> +#define MMC_SPI_CMD0_CRC ((0x4a << 1) | 0x1)
> +
> static int mmc_spi_command_send(struct mmc_spi_host *host, struct mci_cmd *cmd)
> {
> uint8_t r1;
> @@ -153,7 +144,11 @@ static int mmc_spi_command_send(struct mmc_spi_host *host, struct mci_cmd *cmd)
> command[3] = cmd->cmdarg >> 16;
> command[4] = cmd->cmdarg >> 8;
> command[5] = cmd->cmdarg;
> +#ifdef CONFIG_MMC_SPI_CRC_ON
> command[6] = (crc7(0, &command[1], 5) << 1) | 0x01;
> +#else
> + command[6] = MMC_SPI_CMD0_CRC;
> +#endif
>
> mmc_spi_writebytes(host, 7, command);
>
> --
> 1.7.7.1
>
Sorry for that one. I did test it but should have missed something....
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