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| author | Jesse Gilles <jgilles@multitech.com> | 2015-01-07 12:32:24 -0600 |
|---|---|---|
| committer | Jesse Gilles <jgilles@multitech.com> | 2015-01-07 12:32:24 -0600 |
| commit | c15cb3f7540562afa86801c2511fc6d983af5fc6 (patch) | |
| tree | 9167ee6defca193cf738eb1f93a2eef562750fa7 /recipes-kernel/linux/linux_3.12.27.bb | |
| parent | 9f9d7b731d9a4c0ed842bd8c70a4b15044fc774f (diff) | |
| download | meta-multitech-c15cb3f7540562afa86801c2511fc6d983af5fc6.tar.gz meta-multitech-c15cb3f7540562afa86801c2511fc6d983af5fc6.tar.bz2 meta-multitech-c15cb3f7540562afa86801c2511fc6d983af5fc6.zip | |
linux-3.12.27: add linux-3.12-spi-atmel-dma-min.patch, build spi-atmel as module
Forces spi-atmel to always use DMA mode instead of switching between
PIO and DMA depending on the transfer size. Switching between the two
can cause Rx buffer corruption with the 3.12 driver.
This comes at the cost of lower performance (15 to 20%) for small
transfers (1-15 bytes), but improves reliability for protocols that use small
and large transfers regularly.
For large transfers (1024 bytes), DMA mode is 300% faster than PIO.
https://lkml.org/lkml/2013/10/21/534
Diffstat (limited to 'recipes-kernel/linux/linux_3.12.27.bb')
| -rw-r--r-- | recipes-kernel/linux/linux_3.12.27.bb | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/recipes-kernel/linux/linux_3.12.27.bb b/recipes-kernel/linux/linux_3.12.27.bb index eb6029c..53ee211 100644 --- a/recipes-kernel/linux/linux_3.12.27.bb +++ b/recipes-kernel/linux/linux_3.12.27.bb @@ -2,7 +2,7 @@ inherit kernel # mts class to build dtb and append to kernel image inherit linux-append-dtb -PR = "r8" +PR = "r9" LICENSE = "GPLv2" LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7" @@ -23,6 +23,7 @@ COMMON_PATCHES = " \ file://linux-3.12.27-option-telit.patch \ file://linux-3.12-cdc-acm-ignore-exar-devices.patch \ file://linux-3.12-release-rfcomm-port-fix.patch \ + file://linux-3.12-spi-atmel-dma-min.patch \ " SRC_URI_append_mtcdt = "\ |