From patchwork Sat Dec 2 22:46:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 749914 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="G5ckIxKQ" Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41350116 for ; Sat, 2 Dec 2023 14:46:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1701557185; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tFzRAWoR+dx2zxJrMSDZyasEFZfoY7FlHgiwVRFecsc=; b=G5ckIxKQJ+VG+uiRZyWPCHlchZoGbMp0oZjGr/yBq2feT+WrMU6nxVTI7mzu05mDozvqBK I9TsejrJaUiVVopc8q9UvuF5sL8UbfGemGiKedSHMu2KHOZiPz2xnvqEMlDui4LEiMzW63 MmWqztW/OG80oYquRhNN5VvNGlFXkvw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-695-oVpfeHTINqKd2NqXzRydbw-1; Sat, 02 Dec 2023 17:46:22 -0500 X-MC-Unique: oVpfeHTINqKd2NqXzRydbw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8AB2880C343; Sat, 2 Dec 2023 22:46:21 +0000 (UTC) Received: from shalem.redhat.com (unknown [10.39.192.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id E33362166B26; Sat, 2 Dec 2023 22:46:19 +0000 (UTC) From: Hans de Goede To: Jiri Kosina , Benjamin Tissoires Cc: Hans de Goede , Douglas Anderson , Julian Sax , ahormann@gmx.net, Bruno Jesus , Dietrich , kloxdami@yahoo.com, Tim Aldridge , Rene Wagner , Federico Ricchiuto , linux-input@vger.kernel.org Subject: [PATCH v3 2/7] HID: i2c-hid: Split i2c_hid_hwreset() in start() and finish() functions Date: Sat, 2 Dec 2023 23:46:09 +0100 Message-ID: <20231202224615.24818-3-hdegoede@redhat.com> In-Reply-To: <20231202224615.24818-1-hdegoede@redhat.com> References: <20231202224615.24818-1-hdegoede@redhat.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Split i2c_hid_hwreset() into: i2c_hid_start_hwreset() which sends the PWR_ON and reset commands; and i2c_hid_finish_hwreset() which actually waits for the reset to complete. This is a preparation patch for removing the need for I2C_HID_QUIRK_NO_IRQ_AFTER_RESET by making i2c-hid behave more like Windows. No functional changes intended. Reviewed-by: Douglas Anderson Signed-off-by: Hans de Goede --- Changes in v2: -Move the mutex_[un]lock(&ihid->reset_lock) calls from i2c_hid_start_hwreset() / i2c_hid_finish_hwreset() to the callers to make the locking more clear --- drivers/hid/i2c-hid/i2c-hid-core.c | 38 ++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 10 deletions(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index ca2a4ccb9abf..21d65ca32866 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -426,7 +426,7 @@ static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state) return ret; } -static int i2c_hid_hwreset(struct i2c_hid *ihid) +static int i2c_hid_start_hwreset(struct i2c_hid *ihid) { size_t length = 0; int ret; @@ -438,11 +438,11 @@ static int i2c_hid_hwreset(struct i2c_hid *ihid) * being reset. Otherwise we may lose the reset complete * interrupt. */ - mutex_lock(&ihid->reset_lock); + lockdep_assert_held(&ihid->reset_lock); ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON); if (ret) - goto err_unlock; + return ret; /* Prepare reset command. Command register goes first. */ *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister; @@ -460,6 +460,18 @@ static int i2c_hid_hwreset(struct i2c_hid *ihid) goto err_clear_reset; } + return 0; + +err_clear_reset: + clear_bit(I2C_HID_RESET_PENDING, &ihid->flags); + i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP); + return ret; +} + +static int i2c_hid_finish_hwreset(struct i2c_hid *ihid) +{ + int ret = 0; + i2c_hid_dbg(ihid, "%s: waiting...\n", __func__); if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) { @@ -477,14 +489,11 @@ static int i2c_hid_hwreset(struct i2c_hid *ihid) if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET)) ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON); - mutex_unlock(&ihid->reset_lock); return ret; err_clear_reset: clear_bit(I2C_HID_RESET_PENDING, &ihid->flags); i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP); -err_unlock: - mutex_unlock(&ihid->reset_lock); return ret; } @@ -731,7 +740,11 @@ static int i2c_hid_parse(struct hid_device *hid) } do { - ret = i2c_hid_hwreset(ihid); + mutex_lock(&ihid->reset_lock); + ret = i2c_hid_start_hwreset(ihid); + if (ret == 0) + ret = i2c_hid_finish_hwreset(ihid); + mutex_unlock(&ihid->reset_lock); if (ret) msleep(1000); } while (tries-- > 0 && ret); @@ -974,10 +987,15 @@ static int i2c_hid_core_resume(struct i2c_hid *ihid) * However some ALPS touchpads generate IRQ storm without reset, so * let's still reset them here. */ - if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME) - ret = i2c_hid_hwreset(ihid); - else + if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME) { + mutex_lock(&ihid->reset_lock); + ret = i2c_hid_start_hwreset(ihid); + if (ret == 0) + ret = i2c_hid_finish_hwreset(ihid); + mutex_unlock(&ihid->reset_lock); + } else { ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON); + } if (ret) return ret;