diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.4/084-0003-spi-bcm53xx-simplify-reading-SPI-data.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.4/084-0003-spi-bcm53xx-simplify-reading-SPI-data.patch | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/target/linux/bcm53xx/patches-4.4/084-0003-spi-bcm53xx-simplify-reading-SPI-data.patch b/target/linux/bcm53xx/patches-4.4/084-0003-spi-bcm53xx-simplify-reading-SPI-data.patch deleted file mode 100644 index ee377c491f..0000000000 --- a/target/linux/bcm53xx/patches-4.4/084-0003-spi-bcm53xx-simplify-reading-SPI-data.patch +++ /dev/null @@ -1,107 +0,0 @@ -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; |