mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 10:39:04 +00:00
5846620890
It was adding unused variable:
drivers/mtd/devices/m25p80.c: In function 'm25p80_write':
drivers/mtd/devices/m25p80.c:85:6: warning: unused variable 'i' [-Wunused-variable]
int i;
^
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
60 lines
1.8 KiB
Diff
60 lines
1.8 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
|
|
Subject: [PATCH] mtd: m25p80: use single SPI message for writing data
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
On all 3 tested Northstar devices with following flash memories:
|
|
mx25l6405d (8192 Kbytes)
|
|
mx25l12805d (16384 Kbytes)
|
|
mx25l25635e (32768 Kbytes)
|
|
I noticed writing to be broken. Not a single bit was changed leaving all
|
|
bytes set to 0xff.
|
|
|
|
This is most likely some problem related to the SPI controller or its
|
|
driver. Using a single SPI message seems to workaround this. Of course
|
|
it's not perfect solution as copying whole data into a new buffer makes
|
|
writing slower.
|
|
|
|
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
|
|
---
|
|
|
|
--- a/drivers/mtd/devices/m25p80.c
|
|
+++ b/drivers/mtd/devices/m25p80.c
|
|
@@ -78,6 +78,7 @@ static void m25p80_write(struct spi_nor
|
|
{
|
|
struct m25p *flash = nor->priv;
|
|
struct spi_device *spi = flash->spi;
|
|
+ u8 *command = kzalloc(MAX_CMD_SIZE + len, GFP_KERNEL);
|
|
struct spi_transfer t[2] = {};
|
|
struct spi_message m;
|
|
int cmd_sz = m25p_cmdsz(nor);
|
|
@@ -87,20 +88,19 @@ static void m25p80_write(struct spi_nor
|
|
if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
|
|
cmd_sz = 1;
|
|
|
|
- flash->command[0] = nor->program_opcode;
|
|
- m25p_addr2cmd(nor, to, flash->command);
|
|
+ command[0] = nor->program_opcode;
|
|
+ m25p_addr2cmd(nor, to, command);
|
|
+ memcpy(&command[cmd_sz], buf, len);
|
|
|
|
- t[0].tx_buf = flash->command;
|
|
- t[0].len = cmd_sz;
|
|
+ t[0].tx_buf = command;
|
|
+ t[0].len = cmd_sz + len;
|
|
spi_message_add_tail(&t[0], &m);
|
|
|
|
- t[1].tx_buf = buf;
|
|
- t[1].len = len;
|
|
- spi_message_add_tail(&t[1], &m);
|
|
-
|
|
spi_sync(spi, &m);
|
|
|
|
*retlen += m.actual_length - cmd_sz;
|
|
+
|
|
+ kfree(command);
|
|
}
|
|
|
|
static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
|