From patchwork Mon May 18 05:08:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antti Palosaari X-Patchwork-Id: 6426081 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 898F29F1CC for ; Mon, 18 May 2015 05:09:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9DFA620617 for ; Mon, 18 May 2015 05:09:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 01ADA20615 for ; Mon, 18 May 2015 05:09:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751240AbbERFJd (ORCPT ); Mon, 18 May 2015 01:09:33 -0400 Received: from mail.kapsi.fi ([217.30.184.167]:35660 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750895AbbERFJa (ORCPT ); Mon, 18 May 2015 01:09:30 -0400 Received: from dyn3-82-128-190-149.psoas.suomi.net ([82.128.190.149] helo=localhost.localdomain.localdomain) by mail.kapsi.fi with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1YuDIu-000536-KD; Mon, 18 May 2015 08:09:28 +0300 From: Antti Palosaari To: linux-media@vger.kernel.org Cc: Antti Palosaari Subject: [PATCH 2/8] m88ds3103: implement DVBv5 CNR statistics Date: Mon, 18 May 2015 08:08:45 +0300 Message-Id: <1431925731-7499-2-git-send-email-crope@iki.fi> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1431925731-7499-1-git-send-email-crope@iki.fi> References: <1431925731-7499-1-git-send-email-crope@iki.fi> X-SA-Exim-Connect-IP: 82.128.190.149 X-SA-Exim-Mail-From: crope@iki.fi X-SA-Exim-Scanned: No (on mail.kapsi.fi); SAEximRunCond expanded to false Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Implement DVBv5 CNR statistics. Signed-off-by: Antti Palosaari --- drivers/media/dvb-frontends/m88ds3103.c | 80 ++++++++++++++++++++++++++++++++- 1 file changed, 78 insertions(+), 2 deletions(-) diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 03dceb5..980a89e 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -190,8 +190,9 @@ static int m88ds3103_read_status(struct dvb_frontend *fe, fe_status_t *status) { struct m88ds3103_priv *priv = fe->demodulator_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; - int ret; + int ret, i, itmp; u8 u8tmp; + u8 buf[3]; *status = 0; @@ -233,6 +234,77 @@ static int m88ds3103_read_status(struct dvb_frontend *fe, fe_status_t *status) dev_dbg(&priv->i2c->dev, "%s: lock=%02x status=%02x\n", __func__, u8tmp, *status); + /* CNR */ + if (priv->fe_status & FE_HAS_VITERBI) { + unsigned int cnr, noise, signal, noise_tot, signal_tot; + + cnr = 0; + /* more iterations for more accurate estimation */ + #define M88DS3103_SNR_ITERATIONS 3 + + switch (c->delivery_system) { + case SYS_DVBS: + itmp = 0; + + for (i = 0; i < M88DS3103_SNR_ITERATIONS; i++) { + ret = m88ds3103_rd_reg(priv, 0xff, &buf[0]); + if (ret) + goto err; + + itmp += buf[0]; + } + + /* use of single register limits max value to 15 dB */ + /* SNR(X) dB = 10 * ln(X) / ln(10) dB */ + itmp = DIV_ROUND_CLOSEST(itmp, 8 * M88DS3103_SNR_ITERATIONS); + if (itmp) + cnr = div_u64((u64) 10000 * intlog2(itmp), intlog2(10)); + break; + case SYS_DVBS2: + noise_tot = 0; + signal_tot = 0; + + for (i = 0; i < M88DS3103_SNR_ITERATIONS; i++) { + ret = m88ds3103_rd_regs(priv, 0x8c, buf, 3); + if (ret) + goto err; + + noise = buf[1] << 6; /* [13:6] */ + noise |= buf[0] & 0x3f; /* [5:0] */ + noise >>= 2; + signal = buf[2] * buf[2]; + signal >>= 1; + + noise_tot += noise; + signal_tot += signal; + } + + noise = noise_tot / M88DS3103_SNR_ITERATIONS; + signal = signal_tot / M88DS3103_SNR_ITERATIONS; + + /* SNR(X) dB = 10 * log10(X) dB */ + if (signal > noise) { + itmp = signal / noise; + cnr = div_u64((u64) 10000 * intlog10(itmp), (1 << 24)); + } + break; + default: + dev_dbg(&priv->i2c->dev, + "%s: invalid delivery_system\n", __func__); + ret = -EINVAL; + goto err; + } + + if (cnr) { + c->cnr.stat[0].scale = FE_SCALE_DECIBEL; + c->cnr.stat[0].svalue = cnr; + } else { + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + } + } else { + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + } + return 0; err: dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret); @@ -577,6 +649,7 @@ err: static int m88ds3103_init(struct dvb_frontend *fe) { struct m88ds3103_priv *priv = fe->demodulator_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; int ret, len, remaining; const struct firmware *fw = NULL; u8 *fw_file; @@ -684,7 +757,9 @@ static int m88ds3103_init(struct dvb_frontend *fe) skip_fw_download: /* warm state */ priv->warm = true; - + /* init stats here in order signal app which stats are supported */ + c->cnr.len = 1; + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; return 0; error_fw_release: @@ -702,6 +777,7 @@ static int m88ds3103_sleep(struct dvb_frontend *fe) dev_dbg(&priv->i2c->dev, "%s:\n", __func__); + priv->fe_status = 0; priv->delivery_system = SYS_UNDEFINED; /* TS Hi-Z */