2018-05-04 5:29 GMT+09:00 jacopo mondi <jacopo@xxxxxxxxxx>:
> Hi Akinobu,
> thank you for the patch
>
> On Mon, Apr 30, 2018 at 02:13:09AM +0900, Akinobu Mita wrote:
>> This splits the s_frame_interval() in subdev video ops into selecting the
>> frame interval and setting up the registers.
>>
>> This is a preparatory change to avoid accessing registers under power
>> saving mode.
>>
>> Cc: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
>> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>> Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>> Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
>> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
>> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
>> ---
>> * v4
>> - No changes
>>
>> drivers/media/i2c/ov772x.c | 56 +++++++++++++++++++++++++++++-----------------
>> 1 file changed, 35 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
>> index edc013d..7ea157e 100644
>> --- a/drivers/media/i2c/ov772x.c
>> +++ b/drivers/media/i2c/ov772x.c
>> @@ -617,25 +617,16 @@ static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
>> return 0;
>> }
>>
>> -static int ov772x_set_frame_rate(struct ov772x_priv *priv,
>> - struct v4l2_fract *tpf,
>> - const struct ov772x_color_format *cfmt,
>> - const struct ov772x_win_size *win)
>> +static unsigned int ov772x_select_fps(struct ov772x_priv *priv,
>> + struct v4l2_fract *tpf)
>
> Please align to the open brace, as all the other functions in the
> driver.
OK.
> Also, is it worth making a function out of this? It is called from one
> place only... see below.
>
>> {
>> - struct i2c_client *client = v4l2_get_subdevdata(&priv->subdev);
>> - unsigned long fin = clk_get_rate(priv->clk);
>> unsigned int fps = tpf->numerator ?
>> tpf->denominator / tpf->numerator :
>> tpf->denominator;
>> unsigned int best_diff;
>> - unsigned int fsize;
>> - unsigned int pclk;
>> unsigned int diff;
>> unsigned int idx;
>> unsigned int i;
>> - u8 clkrc = 0;
>> - u8 com4 = 0;
>> - int ret;
>>
>> /* Approximate to the closest supported frame interval. */
>> best_diff = ~0L;
>> @@ -646,7 +637,25 @@ static int ov772x_set_frame_rate(struct ov772x_priv *priv,
>> best_diff = diff;
>> }
>> }
>> - fps = ov772x_frame_intervals[idx];
>> +
>> + return ov772x_frame_intervals[idx];
>> +}
>> +
>> +static int ov772x_set_frame_rate(struct ov772x_priv *priv,
>> + unsigned int fps,
>> + const struct ov772x_color_format *cfmt,
>> + const struct ov772x_win_size *win)
>> +{
>> + struct i2c_client *client = v4l2_get_subdevdata(&priv->subdev);
>> + unsigned long fin = clk_get_rate(priv->clk);
>> + unsigned int fsize;
>> + unsigned int pclk;
>> + unsigned int best_diff;
>
> Please keep variable declarations sorted as in other functions in the
> driver.
OK.
>> + unsigned int diff;
>> + unsigned int i;
>> + u8 clkrc = 0;
>> + u8 com4 = 0;
>> + int ret;
>>
>> /* Use image size (with blankings) to calculate desired pixel clock. */
>> switch (cfmt->com7 & OFMT_MASK) {
>> @@ -711,10 +720,6 @@ static int ov772x_set_frame_rate(struct ov772x_priv *priv,
>> if (ret < 0)
>> return ret;
>>
>> - tpf->numerator = 1;
>> - tpf->denominator = fps;
>> - priv->fps = tpf->denominator;
>> -
>> return 0;
>> }
>>
>> @@ -735,8 +740,20 @@ static int ov772x_s_frame_interval(struct v4l2_subdev *sd,
>> {
>> struct ov772x_priv *priv = to_ov772x(sd);
>> struct v4l2_fract *tpf = &ival->interval;
>> + unsigned int fps;
>> + int ret;
>> +
>> + fps = ov772x_select_fps(priv, tpf);
>
> That's the only caller of this function. I'm fine if you want to keep
> it as it is though.
I would like to keep ov772x_select_fps() because the function name is
self descriptive and imples it doesn't change HW registers. So I feel
it helps readability a bit.
> Thanks
> j
>
>
>> +
>> + ret = ov772x_set_frame_rate(priv, fps, priv->cfmt, priv->win);
>> + if (ret)
>> + return ret;
>>
>> - return ov772x_set_frame_rate(priv, tpf, priv->cfmt, priv->win);
>> + tpf->numerator = 1;
>> + tpf->denominator = fps;
>> + priv->fps = fps;
>> +
>> + return 0;
>> }
>>
>> static int ov772x_s_ctrl(struct v4l2_ctrl *ctrl)
>> @@ -993,7 +1010,6 @@ static int ov772x_set_params(struct ov772x_priv *priv,
>> const struct ov772x_win_size *win)
>> {
>> struct i2c_client *client = v4l2_get_subdevdata(&priv->subdev);
>> - struct v4l2_fract tpf;
>> int ret;
>> u8 val;
>>
>> @@ -1075,9 +1091,7 @@ static int ov772x_set_params(struct ov772x_priv *priv,
>> goto ov772x_set_fmt_error;
>>
>> /* COM4, CLKRC: Set pixel clock and framerate. */
>> - tpf.numerator = 1;
>> - tpf.denominator = priv->fps;
>> - ret = ov772x_set_frame_rate(priv, &tpf, cfmt, win);
>> + ret = ov772x_set_frame_rate(priv, priv->fps, cfmt, win);
>> if (ret < 0)
>> goto ov772x_set_fmt_error;
>>
>> --
>> 2.7.4
>>
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