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

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Date:   Fri, 10 Dec 2021 13:59:09 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Antti Palosaari <crope@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: [PATCH 2/3] media: si2157: add support for 1.7MHz and 6.1 MHz

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@...nel.org>
---

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@kernel.org/

 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