From patchwork Thu Jun 3 06:28:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12296347 X-Patchwork-Delegate: kvalo@adurom.com 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 9FDB2C47096 for ; Thu, 3 Jun 2021 06:28:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F453611BF for ; Thu, 3 Jun 2021 06:28:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229734AbhFCGaD (ORCPT ); Thu, 3 Jun 2021 02:30:03 -0400 Received: from muru.com ([72.249.23.125]:35742 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229702AbhFCGaD (ORCPT ); Thu, 3 Jun 2021 02:30:03 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 3473B8027; Thu, 3 Jun 2021 06:28:25 +0000 (UTC) From: Tony Lindgren To: Kalle Valo Cc: Eyal Reizer , Guy Mishol , Raz Bouganim , linux-wireless@vger.kernel.org, linux-omap@vger.kernel.org, Carl Philipp Klemm Subject: [PATCH] wlcore/wl12xx: Fix wl12xx get_mac error if device is in ELP Date: Thu, 3 Jun 2021 09:28:14 +0300 Message-Id: <20210603062814.19464-1-tony@atomide.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org At least on wl12xx, reading the MAC after boot can fail with a warning at drivers/net/wireless/ti/wlcore/sdio.c:78 wl12xx_sdio_raw_read. The failed call comes from wl12xx_get_mac() that wlcore_nvs_cb() calls after request_firmware_work_func(). After the error, no wireless interface is created. Reloading the wl12xx module makes the interface work. Turns out the wlan controller can be in a low-power ELP state after the boot from the bootloader or kexec, and needs to be woken up first. Let's wake the hardware and add a sleep after that similar to wl12xx_pre_boot() is already doing. Note that a similar issue could exist for wl18xx, but I have not seen it so far. And a search for wl18xx_get_mac and wl12xx_sdio_raw_read did not produce similar errors. Cc: Carl Philipp Klemm Signed-off-by: Tony Lindgren --- drivers/net/wireless/ti/wl12xx/main.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/ti/wl12xx/main.c b/drivers/net/wireless/ti/wl12xx/main.c --- a/drivers/net/wireless/ti/wl12xx/main.c +++ b/drivers/net/wireless/ti/wl12xx/main.c @@ -1503,6 +1503,13 @@ static int wl12xx_get_fuse_mac(struct wl1271 *wl) u32 mac1, mac2; int ret; + /* Device may be in ELP from the bootloader or kexec */ + ret = wlcore_write32(wl, WL12XX_WELP_ARM_COMMAND, WELP_ARM_COMMAND_VAL); + if (ret < 0) + goto out; + + usleep_range(500000, 700000); + ret = wlcore_set_partition(wl, &wl->ptable[PART_DRPW]); if (ret < 0) goto out;