On Tue, 2016-12-06 at 14:57 +0700, Tin Huynh wrote:
> ACPI always sets txfifo and rxfifo to 32. This configuration will
> cause problem if the IP core supports a fifo size of less than 32.
> The driver should read the fifo size from the IP and select the
> smaller one of the two.
>
> Signed-off-by: Tin Huynh <tnhuynh@xxxxxxx>
>
The idea looks good, but see my comment below.
> >dev);
> + u32 param1, tx_fifo_depth, rx_fifo_depth;
> struct dw_i2c_dev *dev;
> struct i2c_adapter *adap;
> struct resource *mem;
> @@ -246,12 +247,18 @@ static int dw_i2c_plat_probe(struct
> platform_device *pdev)
> 1000000);
> }
>
> + param1 = i2c_dw_read_comp_param(dev);
> + tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
> + rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
> if (!dev->tx_fifo_depth) {
> - u32 param1 = i2c_dw_read_comp_param(dev);
> -
> - dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
> - dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
> + dev->tx_fifo_depth = tx_fifo_depth;
> + dev->rx_fifo_depth = rx_fifo_depth;
> dev->adapter.nr = pdev->id;
> + } else if (tx_fifo_depth) {
> + dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
> + tx_fifo_depth
> );
> + dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth,
> + rx_fifo_dept
Can we move this to a separate function like
static void dw_i2c_set_fifo_size(... *dev, ... id)
{
u32 param, tx_fifo_depth, rx_fifo_depth;
param = i2c_dw_read_comp_param(dev);
tx_fifo_depth = ((param >> 16) & 0xff) + 1;
rx_fifo_depth = ((param >> 8) & 0xff) + 1;
if (!dev->tx_fifo_depth) {
dev->tx_fifo_depth = tx_fifo_depth;
dev->rx_fifo_depth = rx_fifo_depth;
dev->adapter.nr = id;
}
dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
tx_fifo_depth);
dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth,
rx_fifo_depth);
}
?
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy
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