On Thu, Mar 13, 2014 at 9:29 AM, Cao Minh Hiep <cm-hiep@xxxxxxxxxxx> wrote:
> In order to transmit and receive data when have 32 bytes of data that
> ready has prepared on Transmit/Receive Buffer to transmit or receive.
> Instead transmits/receives a byte data using Transmit/Receive Buffer
> Data Triggering Number will improve the speed of transfer data.
Thanks for your patch, this looks like a valuable improvement!
Unfortunately your patch doesn't apply against spi/for-next anymore, as
the driver has changed a lot lately, due to the addition of RZ/A1H and
Quad/Dual support.
> +static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg)
> +{
> + u8 data;
> +
> + data = rspi_read8(rspi, reg);
> + data &= ~mask;
> + data |= (val & mask);
I think this "& mask" is superfluous.
> + rspi_write8(rspi, data, reg);
> +}
> +static int qspi_set_send_trigger(struct rspi_data *rspi, int remain)
> +{
> + int n;
> +
> + n = min(remain, QSPI_BUFFER_SIZE);
> +
> + if (remain >= QSPI_BUFFER_SIZE) {
> + /* sets triggering number to 32 bytes */
"0 bytes"? (comment copied from qspi_set_receive_trigger())
> + qspi_update(rspi, SPBFCR_TXTRG_MASK,
> + SPBFCR_TXTRG_0B, QSPI_SPBFCR);
> + } else {
> + /* sets triggering number to 1 byte */
"31 bytes"?
> + qspi_update(rspi, SPBFCR_TXTRG_MASK,
> + SPBFCR_TXTRG_31B, QSPI_SPBFCR);
> + }
> @@ -389,9 +443,10 @@ static int qspi_send_pio(struct rspi_data *rspi, struct spi_message *mesg,
> {
> int remain = t->len;
> const u8 *data = t->tx_buf;
> + int i, n;
>
> rspi_write8(rspi, SPBFCR_TXRST, QSPI_SPBFCR);
> - rspi_write8(rspi, 0x00, QSPI_SPBFCR);
> + rspi_write8(rspi, DUMMY_DATA, QSPI_SPBFCR);
I think this should stay "0x00", as it's not dummy data written to the
transmit data register.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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