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author | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-16 10:44:50 -0800 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-16 10:44:50 -0800 |
commit | 491acf0032c08a74a4c88032ca1c03b498bfec37 (patch) | |
tree | b7194d3afb144fa007d0ca6a11c96297f36d42f8 /drivers/usb/musb/musbhsdma.c | |
parent | 06fc8846a2c0ddcc51e6666a78fc29a8e749ca3b (diff) | |
parent | e53beacd23d9cb47590da6a7a7f6d417b941a994 (diff) | |
download | kernel_samsung_smdk4412-491acf0032c08a74a4c88032ca1c03b498bfec37.zip kernel_samsung_smdk4412-491acf0032c08a74a4c88032ca1c03b498bfec37.tar.gz kernel_samsung_smdk4412-491acf0032c08a74a4c88032ca1c03b498bfec37.tar.bz2 |
Staging: Merge 2.6.37-rc2 into staging-next
This was necessary in order to resolve some conflicts that happened
between -rc1 and -rc2 with the following files:
drivers/staging/bcm/Bcmchar.c
drivers/staging/intel_sst/intel_sst_app_interface.c
All should be resolved now.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb/musbhsdma.c')
-rw-r--r-- | drivers/usb/musb/musbhsdma.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c index 6f771af..563114d 100644 --- a/drivers/usb/musb/musbhsdma.c +++ b/drivers/usb/musb/musbhsdma.c @@ -158,6 +158,8 @@ static int dma_channel_program(struct dma_channel *channel, dma_addr_t dma_addr, u32 len) { struct musb_dma_channel *musb_channel = channel->private_data; + struct musb_dma_controller *controller = musb_channel->controller; + struct musb *musb = controller->private_data; DBG(2, "ep%d-%s pkt_sz %d, dma_addr 0x%x length %d, mode %d\n", musb_channel->epnum, @@ -167,6 +169,18 @@ static int dma_channel_program(struct dma_channel *channel, BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN || channel->status == MUSB_DMA_STATUS_BUSY); + /* + * The DMA engine in RTL1.8 and above cannot handle + * DMA addresses that are not aligned to a 4 byte boundary. + * It ends up masking the last two bits of the address + * programmed in DMA_ADDR. + * + * Fail such DMA transfers, so that the backup PIO mode + * can carry out the transfer + */ + if ((musb->hwvers >= MUSB_HWVERS_1800) && (dma_addr % 4)) + return false; + channel->actual_len = 0; musb_channel->start_addr = dma_addr; musb_channel->len = len; |