bcm53xx: add upstream patch fixing SPI controller driver

That patch fixes handling SPI messages with two writing transfers. It's
important when using e.g. by m25p80 driver which uses one transfer for
opcode and another one for data.

Thanks to that fix we can now drop m25p80 workaround patch. It means one
less hack and also a better flash writing performance as there is no
more data buf copying.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 0 insertions, 59 deletions

diff --git a/target/linux/bcm53xx/patches-4.4/406-mtd-m25p80-use-single-SPI-message-for-writing-data.patch b/target/linux/bcm53xx/patches-4.4/406-mtd-m25p80-use-single-SPI-message-for-writing-data.patch
deleted file mode 100644
index d5525f6223..0000000000
--- a/target/linux/bcm53xx/patches-4.4/406-mtd-m25p80-use-single-SPI-message-for-writing-data.patch
+++ /dev/null
@@ -1,59 +0,0 @@
-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)