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path: root/target/linux/brcm2708/patches-3.10/0046-spi-spi-bcm2708-respect-per-transfer-SPI-clock-speed.patch
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Diffstat (limited to 'target/linux/brcm2708/patches-3.10/0046-spi-spi-bcm2708-respect-per-transfer-SPI-clock-speed.patch')
-rw-r--r--target/linux/brcm2708/patches-3.10/0046-spi-spi-bcm2708-respect-per-transfer-SPI-clock-speed.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-3.10/0046-spi-spi-bcm2708-respect-per-transfer-SPI-clock-speed.patch b/target/linux/brcm2708/patches-3.10/0046-spi-spi-bcm2708-respect-per-transfer-SPI-clock-speed.patch
new file mode 100644
index 0000000..0baa6cb
--- /dev/null
+++ b/target/linux/brcm2708/patches-3.10/0046-spi-spi-bcm2708-respect-per-transfer-SPI-clock-speed.patch
@@ -0,0 +1,42 @@
+From 444149f35455bfe551ce9dfa21d00b5b34ffb04f Mon Sep 17 00:00:00 2001
+From: Kamal Mostafa <kamal@whence.com>
+Date: Mon, 22 Oct 2012 15:52:44 -0700
+Subject: [PATCH 046/174] spi/spi-bcm2708: respect per-transfer SPI clock
+ speed_hz value
+
+The bcm2708 SPI driver's bcm2708_process_transfer() was ignoring the
+per-transfer speed_hz value even when it was provided (it always just
+used the spi device's max_speed_hz value). Now, per-transfer speed_hz
+values are respected.
+
+Also added debug print to bcm2708_setup_state() to help keep an eye on
+the configured SPI parameters.
+
+Signed-off-by: Kamal Mostafa <kamal@whence.com>
+---
+ drivers/spi/spi-bcm2708.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+--- a/drivers/spi/spi-bcm2708.c
++++ b/drivers/spi/spi-bcm2708.c
+@@ -259,6 +259,10 @@ static int bcm2708_setup_state(struct sp
+ if (state) {
+ state->cs = cs;
+ state->cdiv = cdiv;
++ dev_dbg(dev, "setup: want %d Hz; "
++ "bus_hz=%lu / cdiv=%u == %lu Hz; "
++ "mode %u: cs 0x%08X\n",
++ hz, bus_hz, cdiv, bus_hz/cdiv, mode, cs);
+ }
+
+ return 0;
+@@ -277,7 +281,8 @@ static int bcm2708_process_transfer(stru
+
+ if (xfer->bits_per_word || xfer->speed_hz) {
+ ret = bcm2708_setup_state(spi->master, &spi->dev, &state,
+- spi->max_speed_hz, spi->chip_select, spi->mode,
++ xfer->speed_hz ? xfer->speed_hz : spi->max_speed_hz,
++ spi->chip_select, spi->mode,
+ spi->bits_per_word);
+ if (ret)
+ return ret;