From patchwork Fri May 17 09:58:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: kuro X-Patchwork-Id: 13666806 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4CE56C04FFE for ; Fri, 17 May 2024 09:48:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C5A9410E219; Fri, 17 May 2024 09:48:12 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="key not found in DNS" (0-bit key; unprotected) header.d=ite.com.tw header.i=@ite.com.tw header.b="ByBzeppH"; dkim-atps=neutral Received: from ironport.ite.com.tw (60-251-196-230.hinet-ip.hinet.net [60.251.196.230]) by gabe.freedesktop.org (Postfix) with ESMTPS id D15BB10E219 for ; Fri, 17 May 2024 09:48:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ite.com.tw; s=dkim; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=SvJuRNCWuYZEZDBBbRcUdX1kPnc4DTTBAf/hI+tHNis=; b=ByBzeppHdnL8oFZ9fDFvq1LIsFVpRkIHbG5gTGAkEa31Z3SbgKdYk5k4 6ibDi6oOJOrt2vsKD69kMEBTDQNbAekRckG8JUmReI3rd/jYRgh11B9nV /JkFycLLKwqxaxkhqHJbamX1XMXCi2n2WAti8/shHc4P1e8hjzw7GcWgj yvRG/d/76ZTp3551s0jrbkyd8y1fK8PO+w+hi5xx4i30l+P0c+YKaVjEq 8uKsTgj2Sj7AvIcRVbncfgLhVGBuouIryG/Oayv6pWGP4JRckul5ta7+o aJaMSBoA1IKd9XxOo9h+w32DiJCZc0eTqxExh8WPaL3EYN7bDnINJzq6X g==; Received: from unknown (HELO mse.ite.com.tw) ([192.168.35.30]) by ironport.ite.com.tw with ESMTP; 17 May 2024 17:48:05 +0800 Received: from CSBMAIL1.internal.ite.com.tw (CSBMAIL1.internal.ite.com.tw [192.168.65.58]) by mse.ite.com.tw with ESMTP id 44H9m2kw037407; Fri, 17 May 2024 17:48:02 +0800 (GMT-8) (envelope-from kuro.chung@ite.com.tw) Received: from ite-XPS-13-9360.internal.ite.com.tw (192.168.72.42) by CSBMAIL1.internal.ite.com.tw (192.168.65.58) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Fri, 17 May 2024 17:48:02 +0800 From: kuro To: Pin-yen Lin , Kenneth Haung , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , AngeloGioacchino Del Regno , Allen Chen , Hermes Wu , "open list:DRM DRIVERS" , open list CC: Kuro Chung Subject: [PATCH v10] drm/bridge: it6505: fix hibernate to resume no display issue Date: Fri, 17 May 2024 17:58:47 +0800 Message-ID: <20240517095847.1035228-1-kuro.chung@ite.com.tw> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [192.168.72.42] X-ClientProxiedBy: CSBMAIL1.internal.ite.com.tw (192.168.65.58) To CSBMAIL1.internal.ite.com.tw (192.168.65.58) X-TM-SNTS-SMTP: 4868C337A08707CA42C15F05D7F5B7B7632440A583D998B48401C964B311050B2002:8 X-MAIL: mse.ite.com.tw 44H9m2kw037407 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Kuro Chung This patch added a FIFO reset bit for input video. When system power resume, the TTL input of it6505 may get some noise before video signal stable and the hardware function reset is required. But the input FIFO reset will also trigger error interrupts of output module rising. Thus, it6505 have to wait a period can clear those expected error interrupts caused by manual hardware reset in one interrupt handler calling to avoid interrupt looping. Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver") --- drivers/gpu/drm/bridge/ite-it6505.c | 73 +++++++++++++++++++---------- 1 file changed, 49 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 469157341f3ab..5703fcf4b7b00 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -1307,9 +1307,15 @@ static void it6505_video_reset(struct it6505 *it6505) it6505_link_reset_step_train(it6505); it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE); it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00); - it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET); + + it6505_set_bits(it6505, REG_VID_BUS_CTRL1, TX_FIFO_RESET, TX_FIFO_RESET); + it6505_set_bits(it6505, REG_VID_BUS_CTRL1, TX_FIFO_RESET, 0x00); + it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, RST_501_FIFO); it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, 0x00); + + it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET); + usleep_range(1000, 2000); it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, 0x00); } @@ -2245,12 +2251,11 @@ static void it6505_link_training_work(struct work_struct *work) if (ret) { it6505->auto_train_retry = AUTO_TRAIN_RETRY; it6505_link_train_ok(it6505); - return; } else { it6505->auto_train_retry--; + it6505_dump(it6505); } - it6505_dump(it6505); } static void it6505_plugged_status_to_codec(struct it6505 *it6505) @@ -2471,31 +2476,53 @@ static void it6505_irq_link_train_fail(struct it6505 *it6505) schedule_work(&it6505->link_works); } -static void it6505_irq_video_fifo_error(struct it6505 *it6505) +static bool it6505_test_bit(unsigned int bit, const unsigned int *addr) { - struct device *dev = it6505->dev; - - DRM_DEV_DEBUG_DRIVER(dev, "video fifo overflow interrupt"); - it6505->auto_train_retry = AUTO_TRAIN_RETRY; - flush_work(&it6505->link_works); - it6505_stop_hdcp(it6505); - it6505_video_reset(it6505); + return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE)); } -static void it6505_irq_io_latch_fifo_overflow(struct it6505 *it6505) +static void it6505_irq_video_handler(struct it6505 *it6505, const int *int_status) { struct device *dev = it6505->dev; + int reg_0d, reg_int03; - DRM_DEV_DEBUG_DRIVER(dev, "IO latch fifo overflow interrupt"); - it6505->auto_train_retry = AUTO_TRAIN_RETRY; - flush_work(&it6505->link_works); - it6505_stop_hdcp(it6505); - it6505_video_reset(it6505); -} + /* + * When video SCDT change with video not stable, + * Or video FIFO error, need video reset + */ -static bool it6505_test_bit(unsigned int bit, const unsigned int *addr) -{ - return 1 & (addr[bit / BITS_PER_BYTE] >> (bit % BITS_PER_BYTE)); + if ((!it6505_get_video_status(it6505) && + (it6505_test_bit(INT_SCDT_CHANGE, (unsigned int *) int_status))) || + (it6505_test_bit(BIT_INT_IO_FIFO_OVERFLOW, (unsigned int *) int_status)) || + (it6505_test_bit(BIT_INT_VID_FIFO_ERROR, (unsigned int *) int_status))) { + + it6505->auto_train_retry = AUTO_TRAIN_RETRY; + flush_work(&it6505->link_works); + it6505_stop_hdcp(it6505); + it6505_video_reset(it6505); + + usleep_range(10000, 11000); + + /* + * Clear FIFO error IRQ to prevent fifo error -> reset loop + * HW will trigger SCDT change IRQ again when video stable + */ + + reg_int03 = it6505_read(it6505, INT_STATUS_03); + reg_0d = it6505_read(it6505, REG_SYSTEM_STS); + + reg_int03 &= (BIT(INT_VID_FIFO_ERROR) | BIT(INT_IO_LATCH_FIFO_OVERFLOW)); + it6505_write(it6505, INT_STATUS_03, reg_int03); + + DRM_DEV_DEBUG_DRIVER(dev, "reg08 = 0x%02x", reg_int03); + DRM_DEV_DEBUG_DRIVER(dev, "reg0D = 0x%02x", reg_0d); + + return; + } + + + if (it6505_test_bit(INT_SCDT_CHANGE, (unsigned int *) int_status)) + it6505_irq_scdt(it6505); } static irqreturn_t it6505_int_threaded_handler(int unused, void *data) @@ -2508,15 +2535,12 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data) } irq_vec[] = { { BIT_INT_HPD, it6505_irq_hpd }, { BIT_INT_HPD_IRQ, it6505_irq_hpd_irq }, - { BIT_INT_SCDT, it6505_irq_scdt }, { BIT_INT_HDCP_FAIL, it6505_irq_hdcp_fail }, { BIT_INT_HDCP_DONE, it6505_irq_hdcp_done }, { BIT_INT_AUX_CMD_FAIL, it6505_irq_aux_cmd_fail }, { BIT_INT_HDCP_KSV_CHECK, it6505_irq_hdcp_ksv_check }, { BIT_INT_AUDIO_FIFO_ERROR, it6505_irq_audio_fifo_error }, { BIT_INT_LINK_TRAIN_FAIL, it6505_irq_link_train_fail }, - { BIT_INT_VID_FIFO_ERROR, it6505_irq_video_fifo_error }, - { BIT_INT_IO_FIFO_OVERFLOW, it6505_irq_io_latch_fifo_overflow }, }; int int_status[3], i; @@ -2546,6 +2570,7 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data) if (it6505_test_bit(irq_vec[i].bit, (unsigned int *)int_status)) irq_vec[i].handler(it6505); } + it6505_irq_video_handler(it6505, (unsigned int *) int_status); } pm_runtime_put_sync(dev);