From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A089C433EF for ; Tue, 17 May 2022 03:33:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236530AbiEQDdQ (ORCPT ); Mon, 16 May 2022 23:33:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232254AbiEQDdJ (ORCPT ); Mon, 16 May 2022 23:33:09 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A64B439807; Mon, 16 May 2022 20:33:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1652758388; x=1684294388; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=D5fyzz6rdwaKPsDIzGmTxmXHHhexwYJnUyY5uei4zH4=; b=ep8I5u6VbKWYao5ghKMsWvWUjGU7E66r4VKY337Q1DXAWB8INf0EUFdL 3lt4jKd5s9KWO/EimoFRwLrkWzRkRW7+/gqLoYZnYaLjvzCCF8s6wEVR5 9Lsx4ne4+NHfNqXsIqf6roZ941t5zvJZ2/ks6QAsTOYdK+InetgAYZ4mj w=; Received: from ironmsg07-lv.qualcomm.com ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 16 May 2022 20:33:07 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg07-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 May 2022 20:33:05 -0700 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Mon, 16 May 2022 20:32:45 -0700 Received: from hu-pkondeti-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Mon, 16 May 2022 20:32:39 -0700 Date: Tue, 17 May 2022 09:02:35 +0530 From: Pavan Kondeti To: Krishna Kurapati CC: Krzysztof Kozlowski , Rob Herring , Andy Gross , Bjorn Andersson , Greg Kroah-Hartman , Stephen Boyd , "Doug Anderson" , Matthias Kaehlcke , Wesley Cheng , , , , , , , , Subject: Re: [v5 2/3] phy: qcom-snps: Add support for overriding phy tuning parameters Message-ID: <20220517033235.GC19209@hu-pkondeti-hyd.qualcomm.com> References: <1652723410-1630-1-git-send-email-quic_kriskura@quicinc.com> <1652723410-1630-3-git-send-email-quic_kriskura@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <1652723410-1630-3-git-send-email-quic_kriskura@quicinc.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Krishna, The patch looks good to me. Minor comments below. On Mon, May 16, 2022 at 11:20:09PM +0530, Krishna Kurapati wrote: > Add support for overriding electrical signal tuning parameters for > SNPS HS Phy. > > Signed-off-by: Krishna Kurapati > --- > drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 268 +++++++++++++++++++++++++- > 1 file changed, 266 insertions(+), 2 deletions(-) > > diff --git a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > index 5d20378..fa60e8d 100644 > --- a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > +++ b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > @@ -52,6 +52,12 @@ > #define USB2_SUSPEND_N BIT(2) > #define USB2_SUSPEND_N_SEL BIT(3) > > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0 (0x6c) > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1 (0x70) > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2 (0x74) > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X3 (0x78) > +#define PARAM_OVRD_MASK 0xFF > + > #define USB2_PHY_USB_PHY_CFG0 (0x94) > #define UTMI_PHY_DATAPATH_CTRL_OVERRIDE_EN BIT(0) > #define UTMI_PHY_CMN_CTRL_OVERRIDE_EN BIT(1) > @@ -60,12 +66,76 @@ > #define REFCLK_SEL_MASK GENMASK(1, 0) > #define REFCLK_SEL_DEFAULT (0x2 << 0) > > +#define HS_DISCONNECT_MASK GENMASK(2, 0) > + > +#define SQUELCH_DETECTOR_MASK GENMASK(7, 5) > + > +#define HS_AMPLITUDE_MASK GENMASK(3, 0) > + > +#define PREEMPHASIS_DURATION_MASK BIT(5) > + > +#define PREEMPHASIS_AMPLITUDE_MASK GENMASK(7, 6) > + > +#define HS_RISE_FALL_MASK GENMASK(1, 0) > + > +#define HS_CROSSOVER_VOLTAGE_MASK GENMASK(3, 2) > + > +#define HS_OUTPUT_IMPEDANCE_MASK GENMASK(5, 4) > + > +#define LS_FS_OUTPUT_IMPEDANCE_MASK GENMASK(3, 0) > + > + > static const char * const qcom_snps_hsphy_vreg_names[] = { > "vdda-pll", "vdda33", "vdda18", > }; > > #define SNPS_HS_NUM_VREGS ARRAY_SIZE(qcom_snps_hsphy_vreg_names) > > +struct override_param { > + s32 value; > + u8 reg; > +}; > + > +#define OVERRIDE_PARAM(bps, val)\ > +{ \ > + .value = bps, \ > + .reg = val, \ > +} > + > +struct override_param_map { > + struct override_param *param_table; > + u8 table_size; > + u8 reg_offset; > + u8 param_mask; > +}; > + > +#define OVERRIDE_PARAM_MAP(table, num_elements, offset, mask) \ > +{ \ > + .param_table = table, \ > + .table_size = num_elements, \ > + .reg_offset = offset, \ > + .param_mask = mask, \ > +} > + > +struct phy_override_seq { > + bool need_update; > + u8 offset; > + u8 value; > + u8 mask; > +}; > + > +static const char *phy_seq_props[] = { > + "qcom,hs-disconnect-bp", > + "qcom,squelch-detector-bp", > + "qcom,hs-amplitude-bp", > + "qcom,pre-emphasis-duration-bp", > + "qcom,pre-emphasis-amplitude-bp", > + "qcom,hs-rise-fall-time-bp", > + "qcom,hs-crossover-voltage-microvolt", > + "qcom,hs-output-impedance-micro-ohm", > + "qcom,ls-fs-output-impedance-bp", > +}; > + > /** > * struct qcom_snps_hsphy - snps hs phy attributes > * > @@ -91,6 +161,7 @@ struct qcom_snps_hsphy { > > bool phy_initialized; > enum phy_mode mode; > + struct phy_override_seq update_seq_cfg[ARRAY_SIZE(phy_seq_props)]; > }; > > static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset, > @@ -173,10 +244,147 @@ static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode, > return 0; > } > > +static struct override_param hs_disconnect_sc7280[] = { > + OVERRIDE_PARAM(-272, 0), > + OVERRIDE_PARAM(0, 1), > + OVERRIDE_PARAM(317, 2), > + OVERRIDE_PARAM(630, 3), > + OVERRIDE_PARAM(973, 4), > + OVERRIDE_PARAM(1332, 5), > + OVERRIDE_PARAM(1743, 6), > + OVERRIDE_PARAM(2156, 7), > +}; > + > +static struct override_param squelch_det_threshold_sc7280[] = { > + OVERRIDE_PARAM(-2090, 7), > + OVERRIDE_PARAM(-1560, 6), > + OVERRIDE_PARAM(-1030, 5), > + OVERRIDE_PARAM(-530, 4), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(530, 2), > + OVERRIDE_PARAM(1060, 1), > + OVERRIDE_PARAM(1590, 0), > +}; > + > +static struct override_param hs_amplitude_sc7280[] = { > + OVERRIDE_PARAM(-660, 0), > + OVERRIDE_PARAM(-440, 1), > + OVERRIDE_PARAM(-220, 2), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(230, 4), > + OVERRIDE_PARAM(440, 5), > + OVERRIDE_PARAM(650, 6), > + OVERRIDE_PARAM(890, 7), > + OVERRIDE_PARAM(1110, 8), > + OVERRIDE_PARAM(1330, 9), > + OVERRIDE_PARAM(1560, 10), > + OVERRIDE_PARAM(1780, 11), > + OVERRIDE_PARAM(2000, 12), > + OVERRIDE_PARAM(2220, 13), > + OVERRIDE_PARAM(2430, 14), > + OVERRIDE_PARAM(2670, 15), > +}; > + > +static struct override_param preemphasis_duration_sc7280[] = { > + OVERRIDE_PARAM(10000, 1), > + OVERRIDE_PARAM(20000, 0), > +}; > + > +static struct override_param preemphasis_amplitude_sc7280[] = { > + OVERRIDE_PARAM(10000, 1), > + OVERRIDE_PARAM(20000, 2), > + OVERRIDE_PARAM(30000, 3), > + OVERRIDE_PARAM(40000, 0), > +}; > + > +static struct override_param hs_rise_fall_time_sc7280[] = { > + OVERRIDE_PARAM(-4100, 3), > + OVERRIDE_PARAM(0, 2), > + OVERRIDE_PARAM(2810, 1), > + OVERRIDE_PARAM(5430, 0), > +}; > + > +static struct override_param hs_crossover_voltage_sc7280[] = { > + OVERRIDE_PARAM(-31000, 1), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(28000, 2), > +}; > + > +static struct override_param hs_output_impedance_sc7280[] = { > + OVERRIDE_PARAM(-2300000, 3), > + OVERRIDE_PARAM(0, 2), > + OVERRIDE_PARAM(2600000, 1), > + OVERRIDE_PARAM(6100000, 0), > +}; > + > +static struct override_param ls_fs_output_impedance_sc7280[] = { > + OVERRIDE_PARAM(-1053, 15), > + OVERRIDE_PARAM(-557, 7), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(612, 1), > + OVERRIDE_PARAM(1310, 0), > +}; > + > +struct override_param_map sc7280_idp[] = { > + OVERRIDE_PARAM_MAP( > + hs_disconnect_sc7280, > + ARRAY_SIZE(hs_disconnect_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0, > + HS_DISCONNECT_MASK), > + > + OVERRIDE_PARAM_MAP( > + squelch_det_threshold_sc7280, > + ARRAY_SIZE(squelch_det_threshold_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0, > + SQUELCH_DETECTOR_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_amplitude_sc7280, > + ARRAY_SIZE(hs_amplitude_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1, > + HS_AMPLITUDE_MASK), > + > + OVERRIDE_PARAM_MAP( > + preemphasis_duration_sc7280, > + ARRAY_SIZE(preemphasis_duration_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1, > + PREEMPHASIS_DURATION_MASK), > + > + OVERRIDE_PARAM_MAP( > + preemphasis_amplitude_sc7280, > + ARRAY_SIZE(preemphasis_amplitude_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1, > + PREEMPHASIS_AMPLITUDE_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_rise_fall_time_sc7280, > + ARRAY_SIZE(hs_rise_fall_time_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2, > + HS_RISE_FALL_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_crossover_voltage_sc7280, > + ARRAY_SIZE(hs_crossover_voltage_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2, > + HS_CROSSOVER_VOLTAGE_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_output_impedance_sc7280, > + ARRAY_SIZE(hs_output_impedance_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2, > + HS_OUTPUT_IMPEDANCE_MASK), > + > + OVERRIDE_PARAM_MAP( > + ls_fs_output_impedance_sc7280, > + ARRAY_SIZE(ls_fs_output_impedance_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X3, > + LS_FS_OUTPUT_IMPEDANCE_MASK), > +}; > + I have cross checked with data book. All the values are looking good. > static int qcom_snps_hsphy_init(struct phy *phy) > { > struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy); > - int ret; > + int ret, i; > > dev_vdbg(&phy->dev, "%s(): Initializing SNPS HS phy\n", __func__); > > @@ -223,6 +431,14 @@ static int qcom_snps_hsphy_init(struct phy *phy) > qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL1, > VBUSVLDEXT0, VBUSVLDEXT0); > > + for (i = 0; i < ARRAY_SIZE(hsphy->update_seq_cfg); i++) { > + if (hsphy->update_seq_cfg[i].need_update) > + qcom_snps_hsphy_write_mask(hsphy->base, > + hsphy->update_seq_cfg[i].offset, > + hsphy->update_seq_cfg[i].mask, > + hsphy->update_seq_cfg[i].value); > + } > + > qcom_snps_hsphy_write_mask(hsphy->base, > USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON2, > VREGBYPASS, VREGBYPASS); > @@ -280,7 +496,10 @@ static const struct phy_ops qcom_snps_hsphy_gen_ops = { > static const struct of_device_id qcom_snps_hsphy_of_match_table[] = { > { .compatible = "qcom,sm8150-usb-hs-phy", }, > { .compatible = "qcom,usb-snps-hs-5nm-phy", }, > - { .compatible = "qcom,usb-snps-hs-7nm-phy", }, > + { > + .compatible = "qcom,usb-snps-hs-7nm-phy", > + .data = &sc7280_idp, > + }, > { .compatible = "qcom,usb-snps-femto-v2-phy", }, > { } > }; > @@ -291,6 +510,50 @@ static const struct dev_pm_ops qcom_snps_hsphy_pm_ops = { > qcom_snps_hsphy_runtime_resume, NULL) > }; > > +static void qcom_snps_hsphy_override_param_update_val( > + const struct override_param_map map, > + s32 dt_val, struct phy_override_seq *seq_entry) > +{ > + int i; > + > + /* > + * Param table for each param is in increasing order > + * of dt values. We need to iterate over the list to > + * select the entry that has equal or the next highest value. > + */ > + for (i = 0 ; i < map.table_size-1; i++) { > + if (map.param_table[i].value >= dt_val) > + break; > + } Minor nit pick: for (i = 0; i < map.table_size - 1; i++) No space is needed before ; added spaces around the - operator. > + > + seq_entry->need_update = true; > + seq_entry->offset = map.reg_offset; > + seq_entry->mask = map.param_mask; > + seq_entry->value = map.param_table[i].reg << __ffs(map.param_mask); > +} > + > +static void qcom_snps_hsphy_read_override_param_seq(struct device *dev) > +{ > + struct device_node *node = dev->of_node; > + s32 val; > + int ret, i; > + struct qcom_snps_hsphy *hsphy; > + struct override_param_map *cfg = > + (struct override_param_map *) of_device_get_match_data(dev); Like I said before, no explicit conversion needed here. also it should be declared const like below const struct override_param_map *cfg = of_device_get_match_data(dev); Thanks, Pavan