[PATCH 2/3] media: si2157: add support for 1.7MHz and 6.1 MHz

[Mauro Carvalho Chehab]

Some tuners allow setting the bandwidth filter to 1.7MHz and
6.1 MHz. Add support for it upstream, as the narrower is the
bandwidth filter, the better.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---

To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH 0/3] at: https://lore.kernel.org/all/cover.1639140967.git.mchehab+huawei@xxxxxxxxxx/

 drivers/media/tuners/si2157.c      | 4 ++++
 drivers/media/tuners/si2157_priv.h | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c
index aeecb38b147f..2d3937af4f5f 100644
--- a/drivers/media/tuners/si2157.c
+++ b/drivers/media/tuners/si2157.c
@@ -458,8 +458,12 @@ static int si2157_set_params(struct dvb_frontend *fe)
 		goto err;
 	}
 
+	if (SUPPORTS_1700KHz(dev) && c->bandwidth_hz <= 1700000)
+		bandwidth = 0x09;
 	if (c->bandwidth_hz <= 6000000)
 		bandwidth = 0x06;
+	if (SUPPORTS_1700KHz(dev) && c->bandwidth_hz <= 6100000)
+		bandwidth = 0x10;
 	else if (c->bandwidth_hz <= 7000000)
 		bandwidth = 0x07;
 	else if (c->bandwidth_hz <= 8000000)
diff --git a/drivers/media/tuners/si2157_priv.h b/drivers/media/tuners/si2157_priv.h
index df17a5f03561..24849c8ed398 100644
--- a/drivers/media/tuners/si2157_priv.h
+++ b/drivers/media/tuners/si2157_priv.h
@@ -66,6 +66,11 @@ struct si2157_cmd {
 	unsigned rlen;
 };
 
+#define SUPPORTS_1700KHz(dev) (((dev)->part_id == SI2141) || \
+			       ((dev)->part_id == SI2147) || \
+			       ((dev)->part_id == SI2157) || \
+			       ((dev)->part_id == SI2177))
+
 /* Old firmware namespace */
 #define SI2158_A20_FIRMWARE "dvb-tuner-si2158-a20-01.fw"
 #define SI2141_A10_FIRMWARE "dvb-tuner-si2141-a10-01.fw"
-- 
2.33.1