On Saturday, June 11, 2011 17:05:30 Hans Verkuil wrote:
> From: Hans Verkuil <[email protected]>
>
> Both s_std and s_tuner are broken because set_mode_freq is called before the
> new std (for s_std) and audmode (for s_tuner) are set.
>
> This patch splits set_mode_freq in a set_mode and a set_freq and in s_std
> first calls set_mode, and if that returns true (i.e. the mode is supported)
> then they set t->std/t->audmode and call set_freq.
>
> This fixes a bug where changing std or audmode would actually change it to
> the previous value.
>
> Discovered while testing analog TV standards for cx18 with a tda18271 tuner.
>
> Signed-off-by: Hans Verkuil <[email protected]>
> ---
> drivers/media/video/tuner-core.c | 57 ++++++++++++++++++++-----------------
> 1 files changed, 31 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/media/video/tuner-core.c
> b/drivers/media/video/tuner-core.c
> index 462a8f4..e5ec145 100644
> --- a/drivers/media/video/tuner-core.c
> +++ b/drivers/media/video/tuner-core.c
> @@ -739,19 +739,15 @@ static bool supported_mode(struct tuner *t, enum
> v4l2_tuner_type mode)
> }
>
> /**
> - * set_mode_freq - Switch tuner to other mode.
> - * @client: struct i2c_client pointer
> + * set_mode - Switch tuner to other mode.
> * @t: a pointer to the module's internal struct_tuner
> * @mode: enum v4l2_type (radio or TV)
> - * @freq: frequency to set (0 means to use the previous one)
> *
> * If tuner doesn't support the needed mode (radio or TV), prints a
> * debug message and returns false, changing its state to standby.
> - * Otherwise, changes the state and sets frequency to the last value
> - * and returns true.
> + * Otherwise, changes the state and returns true.
> */
> -static bool set_mode_freq(struct i2c_client *client, struct tuner *t,
> - enum v4l2_tuner_type mode, unsigned int freq)
> +static bool set_mode(struct tuner *t, enum v4l2_tuner_type mode)
> {
> struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
>
> @@ -767,17 +763,27 @@ static bool set_mode_freq(struct i2c_client *client,
> struct tuner *t,
> t->mode = mode;
> tuner_dbg("Changing to mode %d\n", mode);
> }
> + return true;
> +}
> +
> +/**
> + * set_freq - Set the tuner to the desired frequency.
> + * @t: a pointer to the module's internal struct_tuner
> + * @freq: frequency to set (0 means to use the current frequency)
> + */
> +static void set_freq(struct tuner *t, unsigned int freq)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
> +
> if (t->mode == V4L2_TUNER_RADIO) {
> - if (freq)
> - t->radio_freq = freq;
> - set_radio_freq(client, t->radio_freq);
> + if (!freq)
> + freq = t->radio_freq;
> + set_radio_freq(client, freq);
> } else {
> - if (freq)
> - t->tv_freq = freq;
> - set_tv_freq(client, t->tv_freq);
> + if (!freq)
> + freq = t->tv_freq;
> + set_tv_freq(client, freq);
> }
> -
> - return true;
> }
>
> /*
> @@ -1034,9 +1040,9 @@ static void tuner_status(struct dvb_frontend *fe)
> static int tuner_s_radio(struct v4l2_subdev *sd)
> {
> struct tuner *t = to_tuner(sd);
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
>
> - set_mode_freq(client, t, V4L2_TUNER_RADIO, 0);
> + set_mode(t, V4L2_TUNER_RADIO);
> + set_freq(t, 0);
> return 0;
> }
>
> @@ -1068,24 +1074,23 @@ static int tuner_s_power(struct v4l2_subdev *sd, int
> on)
> static int tuner_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
> {
> struct tuner *t = to_tuner(sd);
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
>
> - if (!set_mode_freq(client, t, V4L2_TUNER_ANALOG_TV, 0))
> + if (!set_mode(t, V4L2_TUNER_ANALOG_TV))
> return 0;
>
> t->std = tuner_fixup_std(t, std);
> if (t->std != std)
> tuner_dbg("Fixup standard %llx to %llx\n", std, t->std);
> -
> + set_freq(t, 0);
> return 0;
> }
>
> static int tuner_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency
> *f)
> {
> struct tuner *t = to_tuner(sd);
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
>
> - set_mode_freq(client, t, f->type, f->frequency);
> + if (set_mode(t, f->type))
> + set_freq(t, f->frequency);
> return 0;
> }
>
> @@ -1154,13 +1159,13 @@ static int tuner_g_tuner(struct v4l2_subdev *sd,
> struct v4l2_tuner *vt)
> static int tuner_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
> {
> struct tuner *t = to_tuner(sd);
> - struct i2c_client *client = v4l2_get_subdevdata(sd);
>
> - if (!set_mode_freq(client, t, vt->type, 0))
> + if (!set_mode(t, vt->type))
> return 0;
>
> if (t->mode == V4L2_TUNER_RADIO)
> t->audmode = vt->audmode;
> + set_freq(t, 0);
This 'if' is missing {}. I'll fix that.
Regards,
Hans
>
> return 0;
> }
> @@ -1195,8 +1200,8 @@ static int tuner_resume(struct i2c_client *c)
> tuner_dbg("resume\n");
>
> if (!t->standby)
> - set_mode_freq(c, t, t->type, 0);
> -
> + if (set_mode(t, t->type))
> + set_freq(t, 0);
> return 0;
> }
>
>
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