From bf28fb50bf705fdd12f749c57abce1796b8c1024 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Mon, 26 Oct 2015 09:01:05 +0000 Subject: brcm2708: update 4.1 patches MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As usual, this patches were taken (and rebased) from https://github.com/raspberrypi/linux/commits/rpi-4.1.y Signed-off-by: Álvaro Fernández Rojas SVN-Revision: 47258 --- ...-fix-overflow-in-calculation-of-transfer-.patch | 53 ++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 target/linux/brcm2708/patches-4.1/0176-spi-bcm2835-fix-overflow-in-calculation-of-transfer-.patch (limited to 'target/linux/brcm2708/patches-4.1/0176-spi-bcm2835-fix-overflow-in-calculation-of-transfer-.patch') diff --git a/target/linux/brcm2708/patches-4.1/0176-spi-bcm2835-fix-overflow-in-calculation-of-transfer-.patch b/target/linux/brcm2708/patches-4.1/0176-spi-bcm2835-fix-overflow-in-calculation-of-transfer-.patch new file mode 100644 index 0000000000..4e55ba946d --- /dev/null +++ b/target/linux/brcm2708/patches-4.1/0176-spi-bcm2835-fix-overflow-in-calculation-of-transfer-.patch @@ -0,0 +1,53 @@ +From 6e1447aaad894f45595a45fc52ae5f7dbe072b2e Mon Sep 17 00:00:00 2001 +From: Martin Sperl +Date: Wed, 29 Jul 2015 07:34:10 +0000 +Subject: [PATCH 176/203] spi: bcm2835: fix overflow in calculation of transfer + time + +This resulted in the use of polling mode when other approaches +(dma or interrupts) would have been more appropriate. + +Happened for transfers longer than 477 bytes. + +Reported-by: Noralf Tronnes +Signed-off-by: Martin Sperl +Signed-off-by: Mark Brown +(cherry picked from commit 0122a5183088e3117bb9c8fbe248914efb502f3f) +--- + drivers/spi/spi-bcm2835.c | 10 ++++++---- + 1 file changed, 6 insertions(+), 4 deletions(-) + +--- a/drivers/spi/spi-bcm2835.c ++++ b/drivers/spi/spi-bcm2835.c +@@ -480,7 +480,7 @@ static int bcm2835_spi_transfer_one_poll + struct spi_device *spi, + struct spi_transfer *tfr, + u32 cs, +- unsigned long xfer_time_us) ++ unsigned long long xfer_time_us) + { + struct bcm2835_spi *bs = spi_master_get_devdata(master); + unsigned long timeout; +@@ -531,7 +531,8 @@ static int bcm2835_spi_transfer_one(stru + { + struct bcm2835_spi *bs = spi_master_get_devdata(master); + unsigned long spi_hz, clk_hz, cdiv; +- unsigned long spi_used_hz, xfer_time_us; ++ unsigned long spi_used_hz; ++ unsigned long long xfer_time_us; + u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS); + + /* set clock */ +@@ -573,9 +574,10 @@ static int bcm2835_spi_transfer_one(stru + bs->rx_len = tfr->len; + + /* calculate the estimated time in us the transfer runs */ +- xfer_time_us = tfr->len ++ xfer_time_us = (unsigned long long)tfr->len + * 9 /* clocks/byte - SPI-HW waits 1 clock after each byte */ +- * 1000000 / spi_used_hz; ++ * 1000000; ++ do_div(xfer_time_us, spi_used_hz); + + /* for short requests run polling*/ + if (xfer_time_us <= BCM2835_SPI_POLLING_LIMIT_US) -- cgit v1.2.3