From mboxrd@z Thu Jan 1 00:00:00 1970 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 6FDDCC433FE for ; Thu, 24 Nov 2022 10:38:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6138A10E266; Thu, 24 Nov 2022 10:38:13 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id E42AF10E266 for ; Thu, 24 Nov 2022 10:38:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1669286290; x=1700822290; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=u9dF9Hik+gFI5RJ1McX/O71OkD3eDrDxlt52mwfG6Js=; b=iqE2lM4O5EtRrZ2hkRqQrTJyOVI7pDH/YDxVZdtQn0PFr6VUuVKLcRe4 cFZgHyE4LBvBYMYjf/L0TAZf+mfYgsgqOGbAOppbgjd+g7noUfpafNRhQ hb3muxvURfcozEp5PSexKrVWC4Un4Si3+KWgdHqH8hGe/x19lQsNCsFvg 7O2ChLPkyJ9U+nrNu4twVfiuJ0sTF5C/06jlgjM0xjoGXPbgAxwUzLKgD /V3tfXBTCV+ucDQK69kHD4R0LZ7A82KLjBbUgMiccUxgWorHo1k6zTKSP QBvtBbeBdo0stq+zoaV1JaUqY4+jl2rnhQBLPRgbZ8Z9IHRmhxIa/HpbN w==; X-IronPort-AV: E=McAfee;i="6500,9779,10540"; a="400566023" X-IronPort-AV: E=Sophos;i="5.96,190,1665471600"; d="scan'208";a="400566023" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2022 02:36:26 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10540"; a="675050020" X-IronPort-AV: E=Sophos;i="5.96,190,1665471600"; d="scan'208";a="675050020" Received: from unknown (HELO slisovsk-Lenovo-ideapad-720S-13IKB.fi.intel.com) ([10.237.72.65]) by orsmga001.jf.intel.com with ESMTP; 24 Nov 2022 02:36:24 -0800 From: Stanislav Lisovskiy To: intel-gfx@lists.freedesktop.org Date: Thu, 24 Nov 2022 12:36:22 +0200 Message-Id: <20221124103623.13974-1-stanislav.lisovskiy@intel.com> X-Mailer: git-send-email 2.37.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [Intel-gfx] [PATCH 0/1] Implement workaround for PLL enabling for DG2/MTL X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jani.nikula@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" It has been noticed by HW team, that there are might be problems when PLL is being enabled with CDCLK squashing being turned on, which might result in loosing register access and/or FIFO underrun. As a workaround it has been proposed to disable CDCLK squashing right before PLL is enabled and enable squashing later, if needed. Stanislav Lisovskiy (1): drm/i915: Implement workaround for CDCLK PLL disable/enable drivers/gpu/drm/i915/display/intel_cdclk.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) -- 2.37.3