leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ARM i.MX dma: Fix burstsize settings

Browse Source 
dmaengine expects the maxburst parameter in words, not bytes.
The imxdma driver and its users do this wrong. Fix this.

As a side note the imx-pcm-dma-mx2 driver was 'fixed' to work
with imx-dma. This broke the driver with imx-sdma support which
correctly takes the maxburst parameter in words. This patch
puts the sdma based sound back to work.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2011-07-06 11:18:33 +02:00
parent 9d73242458
commit 6584cb8825
3 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/dma/imx-dma.c
View File

@ -135,7 +135,8 @@ static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
if (ret)
return ret;
imx_dma_config_burstlen(imxdmac->imxdma_channel, imxdmac->watermark_level);
imx_dma_config_burstlen(imxdmac->imxdma_channel,
imxdmac->watermark_level * imxdmac->word_size);
return 0;
default:

8
drivers/mmc/host/mxcmmc.c
View File

@ -715,13 +715,13 @@ static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
int burstlen, ret;
/*
* use burstlen of 64 in 4 bit mode (--> reg value 0)
* use burstlen of 16 in 1 bit mode (--> reg value 16)
* use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0)
* use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16)
*/
if (ios->bus_width == MMC_BUS_WIDTH_4)
burstlen = 64;
else
burstlen = 16;
else
burstlen = 4;
if (mxcmci_use_dma(host) && burstlen != host->burstlen) {
host->burstlen = burstlen;

4
sound/soc/imx/imx-pcm-dma-mx2.c
View File

@ -110,12 +110,12 @@ static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
slave_config.direction = DMA_TO_DEVICE;
slave_config.dst_addr = dma_params->dma_addr;
slave_config.dst_addr_width = buswidth;
slave_config.dst_maxburst = dma_params->burstsize * buswidth;
slave_config.dst_maxburst = dma_params->burstsize;
} else {
slave_config.direction = DMA_FROM_DEVICE;
slave_config.src_addr = dma_params->dma_addr;
slave_config.src_addr_width = buswidth;
slave_config.src_maxburst = dma_params->burstsize * buswidth;
slave_config.src_maxburst = dma_params->burstsize;
}
ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);