redonkable/alistair23-linux
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dmaengine: dw: don't override platform data with autocfg

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Let probe driver decide either it wants to auto configure the driver or have
explicitly defined properties.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2015-10-13 20:09:17 +03:00 committed by Vinod Koul
parent 49dfebebfb
commit 30cb2639aa
1 changed files with 27 additions and 30 deletions
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57
drivers/dma/dw/core.c
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@ -1499,9 +1499,8 @@ EXPORT_SYMBOL(dw_dma_cyclic_free);
int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
{
struct dw_dma *dw;
bool autocfg;
bool autocfg = false;
unsigned int dw_params;
unsigned int nr_channels;
unsigned int max_blk_size = 0;
int err;
int i;
@ -1515,33 +1514,41 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
pm_runtime_get_sync(chip->dev);
dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);
autocfg = dw_params >> DW_PARAMS_EN & 0x1;
if (!pdata) {
dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);
dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params);
dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params);
autocfg = dw_params >> DW_PARAMS_EN & 1;
if (!autocfg) {
err = -EINVAL;
goto err_pdata;
}
if (!pdata && autocfg) {
pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
err = -ENOMEM;
goto err_pdata;
}
/* Get hardware configuration parameters */
pdata->nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 7) + 1;
pdata->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1;
for (i = 0; i < pdata->nr_masters; i++) {
pdata->data_width[i] =
(dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2;
}
max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
/* Fill platform data with the default values */
pdata->is_private = true;
pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
} else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
} else if (pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
err = -EINVAL;
goto err_pdata;
}
if (autocfg)
nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1;
else
nr_channels = pdata->nr_channels;
dw->chan = devm_kcalloc(chip->dev, nr_channels, sizeof(*dw->chan),
dw->chan = devm_kcalloc(chip->dev, pdata->nr_channels, sizeof(*dw->chan),
GFP_KERNEL);
if (!dw->chan) {
err = -ENOMEM;
@ -1549,22 +1556,12 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
}
/* Get hardware configuration parameters */
if (autocfg) {
max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
dw->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1;
for (i = 0; i < dw->nr_masters; i++) {
dw->data_width[i] =
(dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2;
}
} else {
dw->nr_masters = pdata->nr_masters;
for (i = 0; i < dw->nr_masters; i++)
dw->data_width[i] = pdata->data_width[i];
}
dw->nr_masters = pdata->nr_masters;
for (i = 0; i < dw->nr_masters; i++)
dw->data_width[i] = pdata->data_width[i];
/* Calculate all channel mask before DMA setup */
dw->all_chan_mask = (1 << nr_channels) - 1;
dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
/* Force dma off, just in case */
dw_dma_off(dw);
@ -1589,7 +1586,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
goto err_pdata;
INIT_LIST_HEAD(&dw->dma.channels);
for (i = 0; i < nr_channels; i++) {
for (i = 0; i < pdata->nr_channels; i++) {
struct dw_dma_chan *dwc = &dw->chan[i];
int r = nr_channels - i - 1;
@ -1603,7 +1600,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
/* 7 is highest priority & 0 is lowest. */
if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING)
dwc->priority = r;
dwc->priority = pdata->nr_channels - i - 1;
else
dwc->priority = i;
@ -1687,7 +1684,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
goto err_dma_register;
dev_info(chip->dev, "DesignWare DMA Controller, %d channels\n",
nr_channels);
pdata->nr_channels);
pm_runtime_put_sync_suspend(chip->dev);