From bc2b395c031430639e5ad5dcb2669cfcf1fa5fd2 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Mon, 27 Feb 2012 05:31:58 -0300 Subject: [media] tea575x: fix HW seek Fix HW seek in TEA575x to work properly: - a delay must be present after search start and before first register read or the seek does weird things - when the search stops, the new frequency is not available immediately, we must wait until it appears in the register (fortunately, we can clear the frequency bits when starting the search as it starts at the frequency currently set, not from the value written) - sometimes, seek remains on the current frequency (or moves only a little), so repeat it until it moves by at least 50 kHz Signed-off-by: Ondrej Zary Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- sound/i2c/other/tea575x-tuner.c | 79 +++++++++++++++++++++++++++++++---------- 1 file changed, 61 insertions(+), 18 deletions(-) (limited to 'sound/i2c/other') diff --git a/sound/i2c/other/tea575x-tuner.c b/sound/i2c/other/tea575x-tuner.c index b291bd8..a63faec 100644 --- a/sound/i2c/other/tea575x-tuner.c +++ b/sound/i2c/other/tea575x-tuner.c @@ -89,7 +89,7 @@ static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val) tea->ops->set_pins(tea, 0); } -static unsigned int snd_tea575x_read(struct snd_tea575x *tea) +static u32 snd_tea575x_read(struct snd_tea575x *tea) { u16 l, rdata; u32 data = 0; @@ -120,6 +120,25 @@ static unsigned int snd_tea575x_read(struct snd_tea575x *tea) return data; } +static u32 snd_tea575x_get_freq(struct snd_tea575x *tea) +{ + u32 freq = snd_tea575x_read(tea) & TEA575X_BIT_FREQ_MASK; + + if (freq == 0) + return freq; + + /* freq *= 12.5 */ + freq *= 125; + freq /= 10; + /* crystal fixup */ + if (tea->tea5759) + freq += TEA575X_FMIF; + else + freq -= TEA575X_FMIF; + + return clamp(freq * 16, FREQ_LO, FREQ_HI); /* from kHz */ +} + static void snd_tea575x_set_freq(struct snd_tea575x *tea) { u32 freq = tea->freq; @@ -225,38 +244,62 @@ static int vidioc_s_hw_freq_seek(struct file *file, void *fh, struct v4l2_hw_freq_seek *a) { struct snd_tea575x *tea = video_drvdata(file); + unsigned long timeout; + int i; if (tea->cannot_read_data) return -ENOTTY; if (a->tuner || a->wrap_around) return -EINVAL; + + /* clear the frequency, HW will fill it in */ + tea->val &= ~TEA575X_BIT_FREQ_MASK; tea->val |= TEA575X_BIT_SEARCH; - tea->val &= ~TEA575X_BIT_UPDOWN; if (a->seek_upward) tea->val |= TEA575X_BIT_UPDOWN; + else + tea->val &= ~TEA575X_BIT_UPDOWN; snd_tea575x_write(tea, tea->val); + timeout = jiffies + msecs_to_jiffies(10000); for (;;) { - unsigned val = snd_tea575x_read(tea); - - if (!(val & TEA575X_BIT_SEARCH)) { - /* Found a frequency */ - val &= TEA575X_BIT_FREQ_MASK; - val = (val * 10) / 125; - if (tea->tea5759) - val += TEA575X_FMIF; - else - val -= TEA575X_FMIF; - tea->freq = clamp(val * 16, FREQ_LO, FREQ_HI); - return 0; - } + if (time_after(jiffies, timeout)) + break; if (schedule_timeout_interruptible(msecs_to_jiffies(10))) { /* some signal arrived, stop search */ tea->val &= ~TEA575X_BIT_SEARCH; - snd_tea575x_write(tea, tea->val); + snd_tea575x_set_freq(tea); return -ERESTARTSYS; } + if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) { + u32 freq; + + /* Found a frequency, wait until it can be read */ + for (i = 0; i < 100; i++) { + msleep(10); + freq = snd_tea575x_get_freq(tea); + if (freq) /* available */ + break; + } + if (freq == 0) /* shouldn't happen */ + break; + /* + * if we moved by less than 50 kHz, or in the wrong + * direction, continue seeking + */ + if (abs(tea->freq - freq) < 16 * 50 || + (a->seek_upward && freq < tea->freq) || + (!a->seek_upward && freq > tea->freq)) { + snd_tea575x_write(tea, tea->val); + continue; + } + tea->freq = freq; + tea->val &= ~TEA575X_BIT_SEARCH; + return 0; + } } - return 0; + tea->val &= ~TEA575X_BIT_SEARCH; + snd_tea575x_set_freq(tea); + return -EAGAIN; } static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl) @@ -320,7 +363,7 @@ int snd_tea575x_init(struct snd_tea575x *tea) return -ENODEV; } - tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40; + tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28; tea->freq = 90500 * 16; /* 90.5Mhz default */ snd_tea575x_set_freq(tea); -- cgit v1.1