mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-05 00:20:32 +00:00
Code Issues Releases Wiki Activity

dmaengine: pxa_dma: fix the maximum requestor line

Browse source 
The current number of requestor lines is limited to 31. This was an
error of a previous commit, as this number is platform dependent, and is
actually :
 - for pxa25x: 40 requestor lines
 - for pxa27x: 75 requestor lines
 - for pxa3xx: 100 requestor lines

The previous testing did not reveal the faulty constant as on pxa[23]xx
platforms, only camera, MSL and USB are above requestor 32, and in these
only the camera has a driver using dma.

Fixes: e87ffbdf06 ("dmaengine: pxa_dma: fix the no-requestor case")
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Robert Jarzmik 2016-02-15 21:57:48 +01:00
parent 72b195cb71
commit 6bab1c6afd
1 changed files with 28 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

39
drivers/dma/pxa_dma.c
View file

@ -122,6 +122,7 @@ struct pxad_chan {
struct pxad_device {
struct dma_device slave;
int nr_chans;
int nr_requestors;
void __iomem *base;
struct pxad_phy *phys;
spinlock_t phy_lock; /* Phy association */
@ -473,7 +474,7 @@ static void pxad_free_phy(struct pxad_chan *chan)
return;
/* clear the channel mapping in DRCMR */
if (chan->drcmr <= DRCMR_CHLNUM) {
if (chan->drcmr <= pdev->nr_requestors) {
reg = pxad_drcmr(chan->drcmr);
writel_relaxed(0, chan->phy->base + reg);
}
@ -509,6 +510,7 @@ static bool is_running_chan_misaligned(struct pxad_chan *chan)
static void phy_enable(struct pxad_phy *phy, bool misaligned)
{
struct pxad_device *pdev;
u32 reg, dalgn;
if (!phy->vchan)
@ -518,7 +520,8 @@ static void phy_enable(struct pxad_phy *phy, bool misaligned)
"%s(); phy=%p(%d) misaligned=%d\n", __func__,
phy, phy->idx, misaligned);
if (phy->vchan->drcmr <= DRCMR_CHLNUM) {
pdev = to_pxad_dev(phy->vchan->vc.chan.device);
if (phy->vchan->drcmr <= pdev->nr_requestors) {
reg = pxad_drcmr(phy->vchan->drcmr);
writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg);
}
@ -908,6 +911,7 @@ static void pxad_get_config(struct pxad_chan *chan,
{
u32 maxburst = 0, dev_addr = 0;
enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
*dcmd = 0;
if (dir == DMA_DEV_TO_MEM) {
@ -916,7 +920,7 @@ static void pxad_get_config(struct pxad_chan *chan,
dev_addr = chan->cfg.src_addr;
*dev_src = dev_addr;
*dcmd |= PXA_DCMD_INCTRGADDR;
if (chan->drcmr <= DRCMR_CHLNUM)
if (chan->drcmr <= pdev->nr_requestors)
*dcmd |= PXA_DCMD_FLOWSRC;
}
if (dir == DMA_MEM_TO_DEV) {
@ -925,7 +929,7 @@ static void pxad_get_config(struct pxad_chan *chan,
dev_addr = chan->cfg.dst_addr;
*dev_dst = dev_addr;
*dcmd |= PXA_DCMD_INCSRCADDR;
if (chan->drcmr <= DRCMR_CHLNUM)
if (chan->drcmr <= pdev->nr_requestors)
*dcmd |= PXA_DCMD_FLOWTRG;
}
if (dir == DMA_MEM_TO_MEM)
@ -1335,13 +1339,15 @@ static struct dma_chan *pxad_dma_xlate(struct of_phandle_args *dma_spec,
static int pxad_init_dmadev(struct platform_device *op,
struct pxad_device *pdev,
unsigned int nr_phy_chans)
unsigned int nr_phy_chans,
unsigned int nr_requestors)
{
int ret;
unsigned int i;
struct pxad_chan *c;
pdev->nr_chans = nr_phy_chans;
pdev->nr_requestors = nr_requestors;
INIT_LIST_HEAD(&pdev->slave.channels);
pdev->slave.device_alloc_chan_resources = pxad_alloc_chan_resources;
pdev->slave.device_free_chan_resources = pxad_free_chan_resources;
@ -1376,7 +1382,7 @@ static int pxad_probe(struct platform_device *op)
const struct of_device_id *of_id;
struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
struct resource *iores;
int ret, dma_channels = 0;
int ret, dma_channels = 0, nb_requestors = 0;
const enum dma_slave_buswidth widths =
DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
DMA_SLAVE_BUSWIDTH_4_BYTES;
@ -1393,13 +1399,23 @@ static int pxad_probe(struct platform_device *op)
return PTR_ERR(pdev->base);
of_id = of_match_device(pxad_dt_ids, &op->dev);
if (of_id)
if (of_id) {
of_property_read_u32(op->dev.of_node, "#dma-channels",
&dma_channels);
else if (pdata && pdata->dma_channels)
ret = of_property_read_u32(op->dev.of_node, "#dma-requests",
&nb_requestors);
if (ret) {
dev_warn(pdev->slave.dev,
"#dma-requests set to default 32 as missing in OF: %d",
ret);
nb_requestors = 32;
};
} else if (pdata && pdata->dma_channels) {
dma_channels = pdata->dma_channels;
else
nb_requestors = pdata->nb_requestors;
} else {
dma_channels = 32; /* default 32 channel */
}
dma_cap_set(DMA_SLAVE, pdev->slave.cap_mask);
dma_cap_set(DMA_MEMCPY, pdev->slave.cap_mask);
@ -1417,7 +1433,7 @@ static int pxad_probe(struct platform_device *op)
pdev->slave.descriptor_reuse = true;
pdev->slave.dev = &op->dev;
ret = pxad_init_dmadev(op, pdev, dma_channels);
ret = pxad_init_dmadev(op, pdev, dma_channels, nb_requestors);
if (ret) {
dev_err(pdev->slave.dev, "unable to register\n");
return ret;
@ -1436,7 +1452,8 @@ static int pxad_probe(struct platform_device *op)
platform_set_drvdata(op, pdev);
pxad_init_debugfs(pdev);
dev_info(pdev->slave.dev, "initialized %d channels\n", dma_channels);
dev_info(pdev->slave.dev, "initialized %d channels on %d requestors\n",
dma_channels, nb_requestors);
return 0;
}