From: "George Spelvin" <linux@horizon.com>
To: linux@horizon.com, pavel@ucw.cz
Cc: arik@wizery.com, david.gnedt@davizone.at, eliad@wizery.com,
jan.nikitenko@gmail.com,
laurent.pinchart+renesas@ideasonboard.com,
linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
linux-spi@vger.kernel.org, linux-wireless@vger.kernel.org,
linville@tuxdriver.com, luca@coelho.fi, tony@atomide.com
Subject: [PATCH 2/3] drivers/mmc/host/mmc_spi.c: Use get/put_unaligned_be32
Date: 11 May 2014 06:05:02 -0400 [thread overview]
Message-ID: <20140511100502.1491.qmail@ns.horizon.com> (raw)
In-Reply-To: <20140511100211.1334.qmail@ns.horizon.com>
Very minor source and binary size reduction.
Signed-off-by: George Spelvin <linux@horizon.com>
---
I spotted this while making the previous crc7 change.
This looks simple enough, but I don't actually have one of these devices to test.
At least one other careful desk-check is solicited.
drivers/mmc/host/mmc_spi.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 338e2202ea..cc8d4a6099 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;
--
1.9.2
next prev parent reply other threads:[~2014-05-11 10:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-11 4:35 [PATCH] lib/crc7: Shift crc7() output left 1 bit George Spelvin
2014-05-11 8:28 ` Pavel Machek
2014-05-11 9:16 ` George Spelvin
2014-05-14 19:56 ` Pavel Machek
2014-05-15 0:32 ` George Spelvin
2014-05-15 6:06 ` Pavel Machek
2014-05-11 10:02 ` [PATCH v2 1/3] " George Spelvin
2014-05-11 10:05 ` George Spelvin [this message]
2014-05-11 10:33 ` [PATCH 2/3] drivers/mmc/host/mmc_spi.c: Use get/put_unaligned_be32 Pavel Machek
2014-05-12 8:05 ` Geert Uytterhoeven
2014-05-14 10:17 ` Ulf Hansson
2014-05-14 12:23 ` George Spelvin
2014-05-14 12:30 ` Ulf Hansson
2014-05-14 14:50 ` John W. Linville
2014-05-11 10:07 ` [PATCH 3/3] drivers/net/wireless/ti/wl*/spi.c: Simplify CRC computation George Spelvin
2014-05-11 10:36 ` Pavel Machek
2014-05-11 10:32 ` [PATCH v2 1/3] lib/crc7: Shift crc7() output left 1 bit Pavel Machek
2014-05-14 10:14 ` Ulf Hansson
2014-05-15 0:37 ` H. Peter Anvin
2014-05-15 1:15 ` George Spelvin
2014-05-15 1:26 ` H. Peter Anvin
2014-05-15 2:02 ` George Spelvin
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