V4L/DVB (13577): [PATCH] dvb-usb-friio: accept center-shifted frequency

This patch adds a fix to accept frequency with its center shifted.

The driver used to accept center frequencies of the normal UHF band channels,
but in ISDB-T, center frequency is shifted with 1/7MHz.
It was shifted internally in the driver,
but this patch enables to accept both types of frequency.

Signed-off-by: Akihiro Tsukada <tskd2@yahoo.co.jp>
Signed-off-by: Patrick Boettcher <pboettcher@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/media/dvb/dvb-usb/friio-fe.c b/drivers/media/dvb/dvb-usb/friio-fe.c
index 9cbbe42ca44b..ebb7b9fd115b 100644
--- a/drivers/media/dvb/dvb-usb/friio-fe.c
+++ b/drivers/media/dvb/dvb-usb/friio-fe.c
@@ -134,11 +134,13 @@ static int jdvbt90502_pll_set_freq(struct jdvbt90502_state *state, u32 freq)
         deb_fe("%s: freq=%d, step=%d\n", __func__, freq,
                state->frontend.ops.info.frequency_stepsize);
         /* freq -> oscilator frequency conversion. */
-        /* freq: 473,000,000 + n*6,000,000 (no 1/7MHz shift to center freq) */
-        /* add 400[1/7 MHZ] = 57.142857MHz.   57MHz for the IF,  */
-        /*                                   1/7MHz for center freq shift */
+        /* freq: 473,000,000 + n*6,000,000 [+ 142857 (center freq. shift)] */
         f = freq / state->frontend.ops.info.frequency_stepsize;
-        f += 400;
+        /* add 399[1/7 MHZ] = 57MHz for the IF  */
+        f += 399;
+        /* add center frequency shift if necessary */
+        if (f % 7 == 0)
+                f++;
         pll_freq_cmd[DEMOD_REDIRECT_REG] = JDVBT90502_2ND_I2C_REG; /* 0xFE */
         pll_freq_cmd[ADDRESS_BYTE] = state->config.pll_address << 1;
         pll_freq_cmd[DIVIDER_BYTE1] = (f >> 8) & 0x7F;