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alistair23-linux
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Merge branch 'fix/edma' into fixes

hifive-unleashed-5.1
Vinod Koul 2016-04-16 22:52:03 +05:30
parent 1cc3334e2e a482f4e0d8
commit 956e6c8e18
1 changed files with 25 additions and 38 deletions
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63
drivers/dma/edma.c
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@ -1238,6 +1238,7 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
struct edma_desc *edesc;
dma_addr_t src_addr, dst_addr;
enum dma_slave_buswidth dev_width;
bool use_intermediate = false;
u32 burst;
int i, ret, nslots;
@ -1279,8 +1280,21 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
* but the synchronization is difficult to achieve with Cyclic and
* cannot be guaranteed, so we error out early.
*/
if (nslots > MAX_NR_SG)
return NULL;
if (nslots > MAX_NR_SG) {
/*
* If the burst and period sizes are the same, we can put
* the full buffer into a single period and activate
* intermediate interrupts. This will produce interrupts
* after each burst, which is also after each desired period.
*/
if (burst == period_len) {
period_len = buf_len;
nslots = 2;
use_intermediate = true;
} else {
return NULL;
}
}
edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
GFP_ATOMIC);
@ -1358,8 +1372,13 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
/*
* Enable period interrupt only if it is requested
*/
if (tx_flags & DMA_PREP_INTERRUPT)
if (tx_flags & DMA_PREP_INTERRUPT) {
edesc->pset[i].param.opt |= TCINTEN;
/* Also enable intermediate interrupts if necessary */
if (use_intermediate)
edesc->pset[i].param.opt |= ITCINTEN;
}
}
/* Place the cyclic channel to highest priority queue */
@ -1570,32 +1589,6 @@ static irqreturn_t dma_ccerr_handler(int irq, void *data)
return IRQ_HANDLED;
}
static void edma_tc_set_pm_state(struct edma_tc *tc, bool enable)
{
struct platform_device *tc_pdev;
int ret;
if (!IS_ENABLED(CONFIG_OF) || !tc)
return;
tc_pdev = of_find_device_by_node(tc->node);
if (!tc_pdev) {
pr_err("%s: TPTC device is not found\n", __func__);
return;
}
if (!pm_runtime_enabled(&tc_pdev->dev))
pm_runtime_enable(&tc_pdev->dev);
if (enable)
ret = pm_runtime_get_sync(&tc_pdev->dev);
else
ret = pm_runtime_put_sync(&tc_pdev->dev);
if (ret < 0)
pr_err("%s: pm_runtime_%s_sync() failed for %s\n", __func__,
enable ? "get" : "put", dev_name(&tc_pdev->dev));
}
/* Alloc channel resources */
static int edma_alloc_chan_resources(struct dma_chan *chan)
{
@ -1632,8 +1625,6 @@ static int edma_alloc_chan_resources(struct dma_chan *chan)
EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id,
echan->hw_triggered ? "HW" : "SW");
edma_tc_set_pm_state(echan->tc, true);
return 0;
err_slot:
@ -1670,7 +1661,6 @@ static void edma_free_chan_resources(struct dma_chan *chan)
echan->alloced = false;
}
edma_tc_set_pm_state(echan->tc, false);
echan->tc = NULL;
echan->hw_triggered = false;
@ -2417,10 +2407,8 @@ static int edma_pm_suspend(struct device *dev)
int i;
for (i = 0; i < ecc->num_channels; i++) {
if (echan[i].alloced) {
if (echan[i].alloced)
edma_setup_interrupt(&echan[i], false);
edma_tc_set_pm_state(echan[i].tc, false);
}
}
return 0;
@ -2450,8 +2438,6 @@ static int edma_pm_resume(struct device *dev)
/* Set up channel -> slot mapping for the entry slot */
edma_set_chmap(&echan[i], echan[i].slot[0]);
edma_tc_set_pm_state(echan[i].tc, true);
}
}
@ -2475,7 +2461,8 @@ static struct platform_driver edma_driver = {
static int edma_tptc_probe(struct platform_device *pdev)
{
return 0;
pm_runtime_enable(&pdev->dev);
return pm_runtime_get_sync(&pdev->dev);
}
static struct platform_driver edma_tptc_driver = {