From patchwork Wed Oct 11 08:12:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 13416845 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 277C9CD98FD for ; Wed, 11 Oct 2023 08:12:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229899AbjJKIMZ (ORCPT ); Wed, 11 Oct 2023 04:12:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57924 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229957AbjJKIMY (ORCPT ); Wed, 11 Oct 2023 04:12:24 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E920C9B for ; Wed, 11 Oct 2023 01:12:22 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42FC5C433C7 for ; Wed, 11 Oct 2023 08:12:22 +0000 (UTC) Message-ID: <515e4b53-db90-417d-a81e-ae1b3e9a358d@xs4all.nl> Date: Wed, 11 Oct 2023 10:12:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US, nl To: Linux Media Mailing List From: Hans Verkuil Subject: [PATCHv2] media: cec: core: count low-drive, error and arb-lost conditions Autocrypt: addr=hverkuil@xs4all.nl; keydata= xsFNBFQ84W0BEAC7EF1iL4s3tY8cRTVkJT/297h0Hz0ypA+ByVM4CdU9sN6ua/YoFlr9k0K4 BFUlg7JzJoUuRbKxkYb8mmqOe722j7N3HO8+ofnio5cAP5W0WwDpM0kM84BeHU0aPSTsWiGR yw55SOK2JBSq7hueotWLfJLobMWhQii0Zd83hGT9SIt9uHaHjgwmtTH7MSTIiaY6N14nw2Ud C6Uykc1va0Wqqc2ov5ihgk/2k2SKa02ookQI3e79laOrbZl5BOXNKR9LguuOZdX4XYR3Zi6/ BsJ7pVCK9xkiVf8svlEl94IHb+sa1KrlgGv3fn5xgzDw8Z222TfFceDL/2EzUyTdWc4GaPMC E/c1B4UOle6ZHg02+I8tZicjzj5+yffv1lB5A1btG+AmoZrgf0X2O1B96fqgHx8w9PIpVERN YsmkfxvhfP3MO3oHh8UY1OLKdlKamMneCLk2up1Zlli347KMjHAVjBAiy8qOguKF9k7HOjif JCLYTkggrRiEiE1xg4tblBNj8WGyKH+u/hwwwBqCd/Px2HvhAsJQ7DwuuB3vBAp845BJYUU3 06kRihFqbO0vEt4QmcQDcbWINeZ2zX5TK7QQ91ldHdqJn6MhXulPKcM8tCkdD8YNXXKyKqNl UVqXnarz8m2JCbHgjEkUlAJCNd6m3pfESLZwSWsLYL49R5yxIwARAQABzSFIYW5zIFZlcmt1 aWwgPGh2ZXJrdWlsQHhzNGFsbC5ubD7CwZUEEwECACgFAlQ84W0CGwMFCRLMAwAGCwkIBwMC BhUIAgkKCwQWAgMBAh4BAheAACEJEL0tYUhmFDtMFiEEBSzee8IVBTtonxvKvS1hSGYUO0wT 7w//frEmPBAwu3OdvAk9VDkH7X+7RcFpiuUcJxs3Xl6jpaA+SdwtZra6W1uMrs2RW8eXXiq/ 80HXJtYnal1Y8MKUBoUVhT/+5+KcMyfVQK3VFRHnNxCmC9HZV+qdyxAGwIscUd4hSlweuU6L 6tI7Dls6NzKRSTFbbGNZCRgl8OrF01TBH+CZrcFIoDgpcJA5Pw84mxo+wd2BZjPA4TNyq1od +slSRbDqFug1EqQaMVtUOdgaUgdlmjV0+GfBHoyCGedDE0knv+tRb8v5gNgv7M3hJO3Nrl+O OJVoiW0G6OWVyq92NNCKJeDy8XCB1yHCKpBd4evO2bkJNV9xcgHtLrVqozqxZAiCRKN1elWF 1fyG8KNquqItYedUr+wZZacqW+uzpVr9pZmUqpVCk9s92fzTzDZcGAxnyqkaO2QTgdhPJT2m wpG2UwIKzzi13tmwakY7OAbXm76bGWVZCO3QTHVnNV8ku9wgeMc/ZGSLUT8hMDZlwEsW7u/D qt+NlTKiOIQsSW7u7h3SFm7sMQo03X/taK9PJhS2BhhgnXg8mOa6U+yNaJy+eU0Lf5hEUiDC vDOI5x++LD3pdrJVr/6ZB0Qg3/YzZ0dk+phQ+KlP6HyeO4LG662toMbFbeLcBjcC/ceEclII 90QNEFSZKM6NVloM+NaZRYVO3ApxWkFu+1mrVTXOwU0EVDzhbQEQANzLiI6gHkIhBQKeQaYs p2SSqF9c++9LOy5x6nbQ4s0X3oTKaMGfBZuiKkkU6NnHCSa0Az5ScRWLaRGu1PzjgcVwzl5O sDawR1BtOG/XoPRNB2351PRp++W8TWo2viYYY0uJHKFHML+ku9q0P+NkdTzFGJLP+hn7x0RT DMbhKTHO3H2xJz5TXNE9zTJuIfGAz3ShDpijvzYieY330BzZYfpgvCllDVM5E4XgfF4F/N90 wWKu50fMA01ufwu+99GEwTFVG2az5T9SXd7vfSgRSkzXy7hcnxj4IhOfM6Ts85/BjMeIpeqy TDdsuetBgX9DMMWxMWl7BLeiMzMGrfkJ4tvlof0sVjurXibTibZyfyGR2ricg8iTbHyFaAzX 2uFVoZaPxrp7udDfQ96sfz0hesF9Zi8d7NnNnMYbUmUtaS083L/l2EDKvCIkhSjd48XF+aO8 VhrCfbXWpGRaLcY/gxi2TXRYG9xCa7PINgz9SyO34sL6TeFPSZn4bPQV5O1j85Dj4jBecB1k z2arzwlWWKMZUbR04HTeAuuvYvCKEMnfW3ABzdonh70QdqJbpQGfAF2p4/iCETKWuqefiOYn pR8PqoQA1DYv3t7y9DIN5Jw/8Oj5wOeEybw6vTMB0rrnx+JaXvxeHSlFzHiD6il/ChDDkJ9J /ejCHUQIl40wLSDRABEBAAHCwXwEGAECAA8FAlQ84W0CGwwFCRLMAwAAIQkQvS1hSGYUO0wW IQQFLN57whUFO2ifG8q9LWFIZhQ7TA1WD/9yxJvQrpf6LcNrr8uMlQWCg2iz2q1LGt1Itkuu KaavEF9nqHmoqhSfZeAIKAPn6xuYbGxXDrpN7dXCOH92fscLodZqZtK5FtbLvO572EPfxneY UT7JzDc/5LT9cFFugTMOhq1BG62vUm/F6V91+unyp4dRlyryAeqEuISykhvjZCVHk/woaMZv c1Dm4Uvkv0Ilelt3Pb9J7zhcx6sm5T7v16VceF96jG61bnJ2GFS+QZerZp3PY27XgtPxRxYj AmFUeF486PHx/2Yi4u1rQpIpC5inPxIgR1+ZFvQrAV36SvLFfuMhyCAxV6WBlQc85ArOiQZB Wm7L0repwr7zEJFEkdy8C81WRhMdPvHkAIh3RoY1SGcdB7rB3wCzfYkAuCBqaF7Zgfw8xkad KEiQTexRbM1sc/I8ACpla3N26SfQwrfg6V7TIoweP0RwDrcf5PVvwSWsRQp2LxFCkwnCXOra gYmkrmv0duG1FStpY+IIQn1TOkuXrciTVfZY1cZD0aVxwlxXBnUNZZNslldvXFtndxR0SFat sflovhDxKyhFwXOP0Rv8H378/+14TaykknRBIKEc0+lcr+EMOSUR5eg4aURb8Gc3Uc7fgQ6q UssTXzHPyj1hAyDpfu8DzAwlh4kKFTodxSsKAjI45SLjadSc94/5Gy8645Y1KgBzBPTH7Q== Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Count how many Low Drive, Error and Arbitration Lost transmit status errors occurred, and expose that in debugfs. Also log the first 8 transmits that result in Low Drive or Error conditions. That really should not happen with well-behaved CEC devices and good HDMI cables. This is useful to detect and debug HDMI cable issues. Signed-off-by: Hans Verkuil --- Changes since v1: - Log the first 8 transmits that resulted in a Low Drive or Error status. --- diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c index 09ca83c23329..f8f7ac61fe55 100644 --- a/drivers/media/cec/core/cec-adap.c +++ b/drivers/media/cec/core/cec-adap.c @@ -511,7 +511,7 @@ int cec_thread_func(void *_adap) pr_warn("cec-%s: transmit timed out\n", adap->name); } adap->transmit_in_progress = false; - adap->tx_timeouts++; + adap->tx_timeout_cnt++; goto unlock; } @@ -625,6 +625,33 @@ void cec_transmit_done_ts(struct cec_adapter *adap, u8 status, msg->tx_low_drive_cnt += low_drive_cnt; msg->tx_error_cnt += error_cnt; + adap->tx_arb_lost_cnt += arb_lost_cnt; + adap->tx_low_drive_cnt += low_drive_cnt; + adap->tx_error_cnt += error_cnt; + + /* + * Low Drive transmission errors should really not happen for + * well-behaved CEC devices and proper HDMI cables. + * + * Ditto for the 'Error' status. + * + * For the first few times that this happens, log this. + * Stop logging after that, since that will not add any more + * useful information and instead it will just flood the kernel log. + */ + if (done && adap->tx_low_drive_log_cnt < 8 && msg->tx_low_drive_cnt) { + adap->tx_low_drive_log_cnt++; + dprintk(0, "low drive counter: %u (seq %u: %*ph)\n", + msg->tx_low_drive_cnt, msg->sequence, + msg->len, msg->msg); + } + if (done && adap->tx_error_log_cnt < 8 && msg->tx_error_cnt) { + adap->tx_error_log_cnt++; + dprintk(0, "error counter: %u (seq %u: %*ph)\n", + msg->tx_error_cnt, msg->sequence, + msg->len, msg->msg); + } + /* Mark that we're done with this transmit */ adap->transmitting = NULL; @@ -1607,6 +1634,8 @@ int cec_adap_enable(struct cec_adapter *adap) if (enable) { adap->last_initiator = 0xff; adap->transmit_in_progress = false; + adap->tx_low_drive_log_cnt = 0; + adap->tx_error_log_cnt = 0; ret = adap->ops->adap_enable(adap, true); if (!ret) { /* @@ -2260,10 +2289,25 @@ int cec_adap_status(struct seq_file *file, void *priv) if (adap->monitor_pin_cnt) seq_printf(file, "file handles in Monitor Pin mode: %u\n", adap->monitor_pin_cnt); - if (adap->tx_timeouts) { - seq_printf(file, "transmit timeouts: %u\n", - adap->tx_timeouts); - adap->tx_timeouts = 0; + if (adap->tx_timeout_cnt) { + seq_printf(file, "transmit timeout count: %u\n", + adap->tx_timeout_cnt); + adap->tx_timeout_cnt = 0; + } + if (adap->tx_low_drive_cnt) { + seq_printf(file, "transmit low drive count: %u\n", + adap->tx_low_drive_cnt); + adap->tx_low_drive_cnt = 0; + } + if (adap->tx_arb_lost_cnt) { + seq_printf(file, "transmit arbitration lost count: %u\n", + adap->tx_arb_lost_cnt); + adap->tx_arb_lost_cnt = 0; + } + if (adap->tx_error_cnt) { + seq_printf(file, "transmit error count: %u\n", + adap->tx_error_cnt); + adap->tx_error_cnt = 0; } data = adap->transmitting; if (data) diff --git a/include/media/cec.h b/include/media/cec.h index 53e4b2eb2b26..0b77ce9f2e65 100644 --- a/include/media/cec.h +++ b/include/media/cec.h @@ -262,7 +262,12 @@ struct cec_adapter { struct cec_log_addrs log_addrs; struct cec_connector_info conn_info; - u32 tx_timeouts; + u32 tx_timeout_cnt; + u32 tx_low_drive_cnt; + u32 tx_error_cnt; + u32 tx_arb_lost_cnt; + u32 tx_low_drive_log_cnt; + u32 tx_error_log_cnt; #ifdef CONFIG_CEC_NOTIFIER struct cec_notifier *notifier;