From 1836eea209546b870dd83f3f4ef234d6598a560d Mon Sep 17 00:00:00 2001 From: George Spelvin Date: Sat, 10 May 2014 10:32:57 -0400 Subject: lib/crc7: Shift crc7() output left 1 bit This eliminates a 1-bit left shift in every single caller, and makes the inner loop of the CRC computation more efficient. Renamed crc7 to crc7_be (big-endian) since the interface changed. Also purged #include from files that don't use it at all. Signed-off-by: George Spelvin Reviewed-by: Pavel Machek Acked-by: Ulf Hansson Signed-off-by: John W. Linville --- drivers/mmc/host/mmc_spi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c index 0a87e569134..338e2202eaa 100644 --- a/drivers/mmc/host/mmc_spi.c +++ b/drivers/mmc/host/mmc_spi.c @@ -472,7 +472,7 @@ mmc_spi_command_send(struct mmc_spi_host *host, *cp++ = (u8)(arg >> 16); *cp++ = (u8)(arg >> 8); *cp++ = (u8)arg; - *cp++ = (crc7(0, &data->status[1], 5) << 1) | 0x01; + *cp++ = crc7_be(0, &data->status[1], 5) | 0x01; /* Then, read up to 13 bytes (while writing all-ones): * - N(CR) (== 1..8) bytes of all-ones -- cgit v1.2.3-70-g09d2 From 9b60fa4a876624f9b57db89ac8fc02b5fcc4f42e Mon Sep 17 00:00:00 2001 From: George Spelvin Date: Sun, 11 May 2014 06:05:02 -0400 Subject: drivers/mmc/host/mmc_spi.c: Use get/put_unaligned_be32 Very minor source and binary size reduction. Signed-off-by: George Spelvin Reviewed-by: Pavel Machek Reviewed-by: Geert Uytterhoeven Acked-by: Ulf Hansson Signed-off-by: John W. Linville --- drivers/mmc/host/mmc_spi.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c index 338e2202eaa..cc8d4a6099c 100644 --- a/drivers/mmc/host/mmc_spi.c +++ b/drivers/mmc/host/mmc_spi.c @@ -448,7 +448,6 @@ mmc_spi_command_send(struct mmc_spi_host *host, { struct scratch *data = host->data; u8 *cp = data->status; - u32 arg = cmd->arg; int status; struct spi_transfer *t; @@ -465,14 +464,12 @@ mmc_spi_command_send(struct mmc_spi_host *host, * We init the whole buffer to all-ones, which is what we need * to write while we're reading (later) response data. */ - memset(cp++, 0xff, sizeof(data->status)); + memset(cp, 0xff, sizeof(data->status)); - *cp++ = 0x40 | cmd->opcode; - *cp++ = (u8)(arg >> 24); - *cp++ = (u8)(arg >> 16); - *cp++ = (u8)(arg >> 8); - *cp++ = (u8)arg; - *cp++ = crc7_be(0, &data->status[1], 5) | 0x01; + cp[1] = 0x40 | cmd->opcode; + put_unaligned_be32(cmd->arg, cp+2); + cp[6] = crc7_be(0, cp+1, 5) | 0x01; + cp += 7; /* Then, read up to 13 bytes (while writing all-ones): * - N(CR) (== 1..8) bytes of all-ones @@ -711,10 +708,7 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t, * so we have to cope with this situation and check the response * bit-by-bit. Arggh!!! */ - pattern = scratch->status[0] << 24; - pattern |= scratch->status[1] << 16; - pattern |= scratch->status[2] << 8; - pattern |= scratch->status[3]; + pattern = get_unaligned_be32(scratch->status); /* First 3 bit of pattern are undefined */ pattern |= 0xE0000000; -- cgit v1.2.3-70-g09d2