From patchwork Wed Feb 24 05:51:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Mosberger-Tang X-Patchwork-Id: 387069 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8D54C433E0 for ; Wed, 24 Feb 2021 05:52:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 84DBB64EBA for ; Wed, 24 Feb 2021 05:52:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233880AbhBXFwh (ORCPT ); Wed, 24 Feb 2021 00:52:37 -0500 Received: from o1.ptr2625.egauge.net ([167.89.112.53]:40939 "EHLO o1.ptr2625.egauge.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233711AbhBXFwf (ORCPT ); Wed, 24 Feb 2021 00:52:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=egauge.net; h=from:subject:mime-version:to:cc:content-transfer-encoding: content-type; s=sgd; bh=wc+RK5tGmY6FeIzTBNgzRNI0oDBWIJRtwAZQIRgUtTQ=; b=JE9ksbQ4D/ZxB8lmBN5B8Ll9VGYNv3YEtSHepkH/nNQ4s0JqNRLh8Y/hvWKQpmcCZYjs vOsiPD3CBdYDJ4L6xp/KdZpIC1eMlRpqr23dbKSypjquF9Rt7M3DY02h+7fkKyXO3uZNsF l/xvj+qhQtndCisQaP/64pxyPNP99qtnQ= Received: by filterdrecv-p3mdw1-7745b6f999-88clt with SMTP id filterdrecv-p3mdw1-7745b6f999-88clt-18-6035E975-1 2021-02-24 05:51:49.069958647 +0000 UTC m=+617729.431238615 Received: from pearl.egauge.net (unknown) by geopod-ismtpd-5-0 (SG) with ESMTP id Byb5h3xgSJe-dCzQbXU-rw Wed, 24 Feb 2021 05:51:48.850 +0000 (UTC) Received: by pearl.egauge.net (Postfix, from userid 1000) id 2B5067001EB; Tue, 23 Feb 2021 22:51:48 -0700 (MST) From: David Mosberger-Tang Subject: [PATCH 1/4] wilc1000: Make SPI transfers work at 48MHz Date: Wed, 24 Feb 2021 05:51:49 +0000 (UTC) Message-Id: <20210224055135.1509200-1-davidm@egauge.net> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-SG-EID: +kMxBqj35EdRUKoy8diX1j4AXmPtd302oan+iXZuF8m2Nw4HRW2irNspffT/khET6RJF6+Prbl0h/EtF1rRLvKisN36aBfL+MQdq6UUoQJ34yctXSpLeL9JtQ1O2MNVnaCNAFL+k0DBL82qwn38GP9HNQb/t1OUDKQKPhriMNRFu5W4lV4GdKn1lyZ6YRWX68QGTUn4y02T9HnYchgG5/fAxhgUT9eGI4zAduAREdDDo6yLplbGDU7ExALVI8y8l4Ugkbx2Lm8WAnxog+QRclg== To: linux-wireless@vger.kernel.org Cc: Ajay Singh , Claudiu Beznea , davidm@egauge.net X-Entity-ID: Xg4JGAcGrJFIz2kDG9eoaQ== Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org For CMD_SINGLE_READ and CMD_INTERNAL_READ, WILC may insert one or more zero bytes between the command response and the DATA Start tag (0xf3). This behavior appears to be undocumented in "ATWILC1000 USER GUIDE" (https://tinyurl.com/4hhshdts) but we have observed 1-4 zero bytes when the SPI bus operates at 48MHz and none when it operates at 1MHz. This code is derived from the equivalent code of the wilc driver in the linux-at91 repository. Signed-off-by: David Mosberger-Tang --- drivers/net/wireless/microchip/wilc1000/spi.c | 42 +++++++++++++------ 1 file changed, 29 insertions(+), 13 deletions(-) diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c index be732929322c..d11e365eeee2 100644 --- a/drivers/net/wireless/microchip/wilc1000/spi.c +++ b/drivers/net/wireless/microchip/wilc1000/spi.c @@ -11,6 +11,16 @@ #include "netdev.h" #include "cfg80211.h" +/* + * For CMD_SINGLE_READ and CMD_INTERNAL_READ, WILC may insert one or + * more zero bytes between the command response and the DATA Start tag + * (0xf3). This behavior appears to be undocumented in "ATWILC1000 + * USER GUIDE" (https://tinyurl.com/4hhshdts) but we have observed 1-4 + * zero bytes when the SPI bus operates at 48MHz and none when it + * operates at 1MHz. + */ +#define WILC_SPI_RSP_HDR_EXTRA_DATA 8 + struct wilc_spi { int crc_off; }; @@ -79,16 +89,15 @@ struct wilc_spi_cmd { } __packed; struct wilc_spi_read_rsp_data { - u8 rsp_cmd_type; - u8 status; - u8 resp_header; - u8 resp_data[4]; + u8 header; + u8 data[4]; u8 crc[]; } __packed; struct wilc_spi_rsp_data { u8 rsp_cmd_type; u8 status; + u8 data[]; } __packed; static int wilc_bus_probe(struct spi_device *spi) @@ -359,10 +368,11 @@ static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b, struct spi_device *spi = to_spi_device(wilc->dev); struct wilc_spi *spi_priv = wilc->bus_data; u8 wb[32], rb[32]; - int cmd_len, resp_len; u8 crc[2]; + int cmd_len, resp_len, i; struct wilc_spi_cmd *c; - struct wilc_spi_read_rsp_data *r; + struct wilc_spi_read_rsp_data *r_data; + struct wilc_spi_rsp_data *r; memset(wb, 0x0, sizeof(wb)); memset(rb, 0x0, sizeof(rb)); @@ -384,7 +394,8 @@ static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b, } cmd_len = offsetof(struct wilc_spi_cmd, u.simple_cmd.crc); - resp_len = sizeof(*r); + resp_len = sizeof(*r) + sizeof(*r_data) + WILC_SPI_RSP_HDR_EXTRA_DATA; + if (!spi_priv->crc_off) { c->u.simple_cmd.crc[0] = wilc_get_crc7(wb, cmd_len); cmd_len += 1; @@ -403,7 +414,7 @@ static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b, return -EINVAL; } - r = (struct wilc_spi_read_rsp_data *)&rb[cmd_len]; + r = (struct wilc_spi_rsp_data *)&rb[cmd_len]; if (r->rsp_cmd_type != cmd) { dev_err(&spi->dev, "Failed cmd response, cmd (%02x), resp (%02x)\n", @@ -417,17 +428,22 @@ static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b, return -EINVAL; } - if (WILC_GET_RESP_HDR_START(r->resp_header) != 0xf) { - dev_err(&spi->dev, "Error, data read response (%02x)\n", - r->resp_header); + for (i = 0; i < WILC_SPI_RSP_HDR_EXTRA_DATA; ++i) + if (WILC_GET_RESP_HDR_START(r->data[i]) == 0xf) + break; + + if (i >= WILC_SPI_RSP_HDR_EXTRA_DATA) { + dev_err(&spi->dev, "Error, data start missing\n"); return -EINVAL; } + r_data = (struct wilc_spi_read_rsp_data *)&r->data[i]; + if (b) - memcpy(b, r->resp_data, 4); + memcpy(b, r_data->data, 4); if (!spi_priv->crc_off) - memcpy(crc, r->crc, 2); + memcpy(crc, r_data->crc, 2); return 0; }