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, 107 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-4.9/182-spi-bcm53xx-simplify-reading-SPI-data.patch b/target/linux/bcm53xx/patches-4.9/182-spi-bcm53xx-simplify-reading-SPI-data.patch
new file mode 100644
index 0000000000..ee377c491f
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.9/182-spi-bcm53xx-simplify-reading-SPI-data.patch
@@ -0,0 +1,107 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 29 Dec 2017 14:44:09 +0100
+Subject: [PATCH] spi: bcm53xx: simplify reading SPI data
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This commit makes transfer function use spi_transfer_is_last to
+determine if currently processed transfer is the last one. Thanks to
+that we finally set hardware registers properly and it makes controller
+behave the way it's expected to.
+
+This allows simplifying read function which can now simply start reading
+from the slot 0 instead of the last saved offset. It has been
+successfully tested using spi_write_then_read.
+
+Moreover this change fixes handling messages with two writing transfers.
+It's important for SPI flash devices as their drivers commonly use one
+transfer for a command and another one for data.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ drivers/spi/spi-bcm53xx.c | 26 ++++++++++----------------
+ 1 file changed, 10 insertions(+), 16 deletions(-)
+
+--- a/drivers/spi/spi-bcm53xx.c
++++ b/drivers/spi/spi-bcm53xx.c
+@@ -27,8 +27,6 @@ struct bcm53xxspi {
+ 	struct bcma_device *core;
+ 	struct spi_master *master;
+ 	void __iomem *mmio_base;
+-
+-	size_t read_offset;
+ 	bool bspi;				/* Boot SPI mode with memory mapping */
+ };
+ 
+@@ -172,8 +170,6 @@ static void bcm53xxspi_buf_write(struct
+ 
+ 	if (!cont)
+ 		bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 0);
+-
+-	b53spi->read_offset = len;
+ }
+ 
+ static void bcm53xxspi_buf_read(struct bcm53xxspi *b53spi, u8 *r_buf,
+@@ -182,10 +178,10 @@ static void bcm53xxspi_buf_read(struct b
+ 	u32 tmp;
+ 	int i;
+ 
+-	for (i = 0; i < b53spi->read_offset + len; i++) {
++	for (i = 0; i < len; i++) {
+ 		tmp = B53SPI_CDRAM_CONT | B53SPI_CDRAM_PCS_DISABLE_ALL |
+ 		      B53SPI_CDRAM_PCS_DSCK;
+-		if (!cont && i == b53spi->read_offset + len - 1)
++		if (!cont && i == len - 1)
+ 			tmp &= ~B53SPI_CDRAM_CONT;
+ 		tmp &= ~0x1;
+ 		/* Command Register File */
+@@ -194,8 +190,7 @@ static void bcm53xxspi_buf_read(struct b
+ 
+ 	/* Set queue pointers */
+ 	bcm53xxspi_write(b53spi, B53SPI_MSPI_NEWQP, 0);
+-	bcm53xxspi_write(b53spi, B53SPI_MSPI_ENDQP,
+-			 b53spi->read_offset + len - 1);
++	bcm53xxspi_write(b53spi, B53SPI_MSPI_ENDQP, len - 1);
+ 
+ 	if (cont)
+ 		bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 1);
+@@ -214,13 +209,11 @@ static void bcm53xxspi_buf_read(struct b
+ 		bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 0);
+ 
+ 	for (i = 0; i < len; ++i) {
+-		int offset = b53spi->read_offset + i;
++		u16 reg = B53SPI_MSPI_RXRAM + 4 * (1 + i * 2);
+ 
+ 		/* Data stored in the transmit register file LSB */
+-		r_buf[i] = (u8)bcm53xxspi_read(b53spi, B53SPI_MSPI_RXRAM + 4 * (1 + offset * 2));
++		r_buf[i] = (u8)bcm53xxspi_read(b53spi, reg);
+ 	}
+-
+-	b53spi->read_offset = 0;
+ }
+ 
+ static int bcm53xxspi_transfer_one(struct spi_master *master,
+@@ -238,7 +231,8 @@ static int bcm53xxspi_transfer_one(struc
+ 		left = t->len;
+ 		while (left) {
+ 			size_t to_write = min_t(size_t, 16, left);
+-			bool cont = left - to_write > 0;
++			bool cont = !spi_transfer_is_last(master, t) ||
++				    left - to_write > 0;
+ 
+ 			bcm53xxspi_buf_write(b53spi, buf, to_write, cont);
+ 			left -= to_write;
+@@ -250,9 +244,9 @@ static int bcm53xxspi_transfer_one(struc
+ 		buf = (u8 *)t->rx_buf;
+ 		left = t->len;
+ 		while (left) {
+-			size_t to_read = min_t(size_t, 16 - b53spi->read_offset,
+-					       left);
+-			bool cont = left - to_read > 0;
++			size_t to_read = min_t(size_t, 16, left);
++			bool cont = !spi_transfer_is_last(master, t) ||
++				    left - to_read > 0;
+ 
+ 			bcm53xxspi_buf_read(b53spi, buf, to_read, cont);
+ 			left -= to_read;