diff options
| author | Olof Johansson <olof@lixom.net> | 2012-05-12 21:19:32 -0700 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-05-14 15:57:21 +0200 |
| commit | 417f381c4568212275f0244500d7d5e1cdb5f99f (patch) | |
| tree | a56d7b281e2ed665fc395e4724611b115a64881b /arch/arm/plat-omap | |
| parent | 87c35c56f4beed9e43bd41427643215655a31c3d (diff) | |
| parent | c8241085e8606a14ef48e6d99556133c48aaddaf (diff) | |
Merge branch 'soc-core' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/renesas into next/soc
* 'soc-core' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/renesas:
ARM: mach-shmobile: clock-r8a7740: use followparent_recalc on usb24s
ARM: mach-shmobile: clock-r8a7740: add MMCIF clock
ARM: mach-shmobile: clock-r8a7740: add SDHI clock
ARM: mach-shmobile: clock-r8a7740: add USB clock
ARM: mach-shmobile: clock-r8a7740: add FSI clock
ARM: mach-shmobile: r8a7740: cleanup I2C workaround method
ARM: mach-shmobile: r8a7740: add gpio_irq support
ARM: mach-shmobile: sh7372: Add FSI DMAEngine support
ARM / mach-shmobile: Use preset_lpj with calibrate_delay()
+ renesas fixes and v3.4-rc6
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/plat-omap')
| -rw-r--r-- | arch/arm/plat-omap/dma.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index ecdb3da0dea9..c58d896cd5c3 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -916,6 +916,13 @@ void omap_start_dma(int lch) l |= OMAP_DMA_CCR_BUFFERING_DISABLE; l |= OMAP_DMA_CCR_EN; + /* + * As dma_write() uses IO accessors which are weakly ordered, there + * is no guarantee that data in coherent DMA memory will be visible + * to the DMA device. Add a memory barrier here to ensure that any + * such data is visible prior to enabling DMA. + */ + mb(); p->dma_write(l, CCR, lch); dma_chan[lch].flags |= OMAP_DMA_ACTIVE; @@ -965,6 +972,13 @@ void omap_stop_dma(int lch) p->dma_write(l, CCR, lch); } + /* + * Ensure that data transferred by DMA is visible to any access + * after DMA has been disabled. This is important for coherent + * DMA regions. + */ + mb(); + if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) { int next_lch, cur_lch = lch; char dma_chan_link_map[dma_lch_count]; |