On Thu, 19 Apr 2012 11:48:15 +0530, Viresh Kumar <viresh.ku...@st.com> wrote:
> Currently, if we request for frequency greater than maximum possible, spi
> driver
> returns error.
>
> For example, if the spi block src frequency is 333/4 MHz, i.e. 83.33.. MHz,
> maximum frequency programmable would be src/2. Which would come around 41.6...
>
> It is difficult to pass frequency in these figures. We normally try to program
> in round figures, like 42 MHz and it should get programmed to <=
> requested_frequency, i.e. 41.6...
>
> For this to happen, we must not return error even if requested freq is higher
> than max possible. But should program it to max possible.
>
> Reported-by: Vinit Kamalaksha Shenoy <vinit.she...@st.com>
> Signed-off-by: Viresh Kumar <viresh.ku...@st.com>
Applied, thanks.
g.
> ---
> drivers/spi/spi-pl022.c | 10 ++++++++--
> 1 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
> index 09c925a..99d5f6d 100644
> --- a/drivers/spi/spi-pl022.c
> +++ b/drivers/spi/spi-pl022.c
> @@ -1667,9 +1667,15 @@ static int calculate_effective_freq(struct pl022
> *pl022, int freq, struct
> /* cpsdvsr = 254 & scr = 255 */
> min_tclk = spi_rate(rate, CPSDVR_MAX, SCR_MAX);
>
> - if (!((freq <= max_tclk) && (freq >= min_tclk))) {
> + if (freq > max_tclk)
> + dev_warn(&pl022->adev->dev,
> + "Max speed that can be programmed is %d Hz, you
> requested %d\n",
> + max_tclk, freq);
> +
> + if (freq < min_tclk) {
> dev_err(&pl022->adev->dev,
> - "controller data is incorrect: out of range frequency");
> + "Requested frequency: %d Hz is less than minimum
> possible %d Hz\n",
> + freq, min_tclk);
> return -EINVAL;
> }
>
> --
> 1.7.9
>
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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