[media] stb0899: allow minimum symbol rate of 1000000

Commit Message

Zoran Turalija May 9, 2013, 9:13 a.m. UTC

On Wed, May 08, 2013 at 03:19:30PM +0200, Zoran Turalija wrote:
> This makes minimum symbol rate driver capabilities on par with
> windows driver, and allows tuning on linux to transponders that
> have symbol rate below 5000000, too.

Looks like product datasheets for tuners containing STB0899 are
suggesting specification for min. symbol rate of 2MS/s.

Some specs found here, all suggesting 2MS/s for min. symbol rate:

    Comtech DVBS2-6899
      http://comtech.sg1002.myweb.hinet.net/pdf/dvbs2-6899.pdf

    TechniSat SkyStar HD2
      http://www.scaistar.com/skystar2/skystarhd2.htm

    Azurewave AD-SP400
      http://www.pulsat.com/products/AzureWave-AD%252dSP400-High-Definition-PC-Card.html

New patch attached.

Patch

From 9cd352d8cdcdac7e63064ec2ed0e05e1e446d1ea Mon Sep 17 00:00:00 2001
From: Zoran Turalija <[e-mail]>
Date: Wed, 8 May 2013 13:50:36 +0200
Subject: [PATCH] [media] stb0899: allow minimum symbol rate of 2MS/s

This makes minimum symbol rate driver capabilities on par with some
accessible datasheet specifications*, and allows tuning on linux to
transponders that have symbol rate between 2000000-5000000, too.

Patch was tested successfully on Eutelsat 16A transponders that
became reachable with it (2000000 < symbol rate < 5000000):

      * DVB/S  12507050 V  2532000 3/4
      * DVB/S2 12574000 V  4355000 3/4 8PSK
      * DVB/S  12593000 V  2500000 2/3
      * DVB/S  12596940 V  2848000 2/3
      * DVB/S  12600750 V  2500000 1/2
      * DVB/S  12675590 H  4248000 3/4

(*) Datasheet: http://comtech.sg1002.myweb.hinet.net/pdf/dvbs2-6899.pdf
        Maximum Symbol Rate
        QPSK/LDPC/PCH: 20-30Mbps
        8PSK/LDPC/BCH: 10-30Mbps
        DVB: 2-45Mbps
             ^--------- min. symbol rate

Signed-off-by: Zoran Turalija <[e-mail]>
---
 stb0899_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stb0899_drv.c b/stb0899_drv.c
index cc278b3..b3ccd3d 100644
--- a/stb0899_drv.c
+++ b/stb0899_drv.c
@@ -1581,7 +1581,7 @@  static struct dvb_frontend_ops stb0899_ops = {
 		.frequency_max 		= 2150000,
 		.frequency_stepsize	= 0,
 		.frequency_tolerance	= 0,
-		.symbol_rate_min 	=  5000000,
+		.symbol_rate_min 	=  2000000,
 		.symbol_rate_max 	= 45000000,
 
 		.caps 			= FE_CAN_INVERSION_AUTO	|
-- 
1.8.1.2