Re: Moorestown SPI

[Tom <tom.spi.devel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi Everyone,

Has anybody noticed such issues?
Or is there something wrong with my protocol driver...
any pointers will be really helpful.

Regards,
Tom

On Fri, May 27, 2011 at 8:22 PM, Tom <tom.spi.devel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> The MRST dw_spi in Transmit & receive mode running on kernel 2.6.35,
> stepping A3, is unable to receive data properly.
> The slave is sending the data as expected, but the spi controller is not
> reading it properly.
>
> If i insert the messages or the delay equivalent as shown below it works.
> Any clue ?
>
> static int u8_writer(struct dw_spi *dws)
> {
> if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL)
>  || (dws->tx == dws->tx_end))
> return 0;
>
> dw_writew(dws, dr, *(u8 *)(dws->tx));
>  // printk("dw write %x ",*(u8 *)(dws->tx));
>  udelay(50);
> ++dws->tx;
>
> wait_till_not_busy(dws);
> return 1;
> }
>
> static int u8_reader(struct dw_spi *dws)
> {//printk("dw spi %s ",__func__);
> while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT)
>  && (dws->rx < dws->rx_end)) {
> *(u8 *)(dws->rx) = dw_readw(dws, dr);
>  // printk("dw read %x ",*(u8 *)(dws->rx));
> udelay(50);
>  ++dws->rx;
> }
>
> wait_till_not_busy(dws);
>  return dws->rx == dws->rx_end;
> }
>
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