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 C375BC4167B for ; Wed, 13 Dec 2023 15:05:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1B3AB10E072; Wed, 13 Dec 2023 15:05:59 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) by gabe.freedesktop.org (Postfix) with ESMTPS id 42BAD10E072 for ; Wed, 13 Dec 2023 15:05:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1702479958; x=1734015958; h=date:from:to:cc:subject:message-id:reply-to:references: mime-version:content-transfer-encoding:in-reply-to; bh=IS90ab+IizQm7rT2/hAE/Y2NVwJakoK9vA4tJZ/lYdw=; b=jx1fZIqcx/ppgVWnpxF0ylHsgWaZaqHkB0DzpUOAt0CEGIeqYqhw8T5J NUQ1Nt/QHYFh4oV9cdozWknRKvCittVALDJmt6wd7kbRZfAdKHqv1ljXM /r6OlnZzkeXthsS1vkLqb4vV8O5oYvD1eEDzEIr5vsUhsARUWOHWgHV7R Rtxpco4rrLLBryVXUh23M1IxW1BcNBl9s3xU7n5fl95W8cxCmyvjrkEh9 3sDXibs0geooLyfbN7Yd3i15UTLNESlvLgndUu403TbUo+gnKwGnkrcNu fYGdVLuEpkzgbc3Jh9okKhI9hJ2w256Zh25bXJspIFEcK/EgTpvdlRQez w==; X-IronPort-AV: E=McAfee;i="6600,9927,10923"; a="8367925" X-IronPort-AV: E=Sophos;i="6.04,273,1695711600"; d="scan'208";a="8367925" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Dec 2023 07:05:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10922"; a="808187635" X-IronPort-AV: E=Sophos;i="6.04,273,1695711600"; d="scan'208";a="808187635" Received: from ideak-desk.fi.intel.com ([10.237.72.78]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Dec 2023 07:05:08 -0800 Date: Wed, 13 Dec 2023 17:05:13 +0200 From: Imre Deak To: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= Subject: Re: [PATCH 3/4] drm/i915/dmc: Also disable HRR event on TGL main DMC Message-ID: References: <20231211213750.27109-1-ville.syrjala@linux.intel.com> <20231211213750.27109-4-ville.syrjala@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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: , Reply-To: imre.deak@intel.com Cc: intel-gfx@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, Dec 13, 2023 at 05:02:52PM +0200, Ville Syrjälä wrote: > On Wed, Dec 13, 2023 at 12:58:08PM +0200, Imre Deak wrote: > > On Wed, Dec 13, 2023 at 11:31:24AM +0200, Ville Syrjälä wrote: > > > On Wed, Dec 13, 2023 at 10:17:58AM +0200, Imre Deak wrote: > > > > On Mon, Dec 11, 2023 at 11:37:49PM +0200, Ville Syrjala wrote: > > > > > From: Ville Syrjälä > > > > > > > > > > Unlike later platforms TGL has the half refresh rate (HRR) event > > > > > on the main DMC (as opposed to the pipe DMC). Since we're disabling > > > > > that event on all later platforms already let's do the same on > > > > > TGL as well. > > > > > > > > > > There is supposedly a bit somewhere (DMC_CHICKEN on TGL) to make > > > > > the handler not do anything, but we don't currently have code > > > > > to frob it. Though that bit should be off by default, the ADL+ > > > > > experience has shown us that trusting any of this isn't a good > > > > > idea. So seems safer to just disable all event handlers we know > > > > > that we don't need. > > > > > > > > > > Also the TGL DMC firmware is apparently using the wrong event > > > > > (undelayed vblank) here anyway. It should be using the delayed > > > > > vblank event instead (like ADL+ firmware does), but they didn't > > > > > release a firmware fix for this and instead just hacked around > > > > > this in the Windows driver code :/ > > > > > > > > > > Signed-off-by: Ville Syrjälä > > > > > --- > > > > > drivers/gpu/drm/i915/display/intel_dmc.c | 5 +++++ > > > > > drivers/gpu/drm/i915/display/intel_dmc_regs.h | 1 + > > > > > 2 files changed, 6 insertions(+) > > > > > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c > > > > > index 9385898e3aa5..0722d322ec63 100644 > > > > > --- a/drivers/gpu/drm/i915/display/intel_dmc.c > > > > > +++ b/drivers/gpu/drm/i915/display/intel_dmc.c > > > > > @@ -448,6 +448,11 @@ static bool disable_dmc_evt(struct drm_i915_private *i915, > > > > > REG_FIELD_GET(DMC_EVT_CTL_EVENT_ID_MASK, data) == DMC_EVT_CTL_EVENT_ID_CLK_MSEC) > > > > > return true; > > > > > > > > > > + /* also disable the HRR event on the main DMC on TGL */ > > > > > + if (IS_TIGERLAKE(i915) && > > > > > + REG_FIELD_GET(DMC_EVT_CTL_EVENT_ID_MASK, data) == DMC_EVT_CTL_EVENT_ID_VBLANK_A) > > > > > > > > The adls FW has the same event (but not the MSEC flip-queue one for some > > > > reason). > > > > > > I can't see it in the binary. Though I am using hexdump so it might > > > also be that I'm looking in the wrong place :P > > > > I see > > dmc-dump -p 0 -i ~/Downloads/adls_dmc_ver2_01.bin > > > > CSS module > > ================================= > > Module type : 9 > > Module header len : 128 bytes > > Module header version : 1.0 > > Module id : 0x00000000 > > Module vendor : 0x00000000 > > Module build date : 2020/05/26 > > Module size : 18704 bytes > > Module key size : 0 > > Module modulus size : 0 > > Module exponent size : 0 > > Module version : 2.1 > > Module kernel header : 0x0 > > > > Package > > =================================== > > Package header len : 400 bytes > > Package header version : 2 > > Package payload entries: 2 > > > > Payload#0 > > ----------------------------------- > > Payload type : main > > Payload CPU stepping : * > > Payload CPU substepping: * > > Payload file offset : 528 > > ----------------------------------- > > FW signature : 0x40403e3e > > FW header len : 256 bytes > > FW header version : 3 > > FW DMC HW version : 12.2 > > FW Project : 0x0c00 > > FW program size : 16784 bytes > > FW program area : 0x080000 - 0x08418f > > FW file offset : 784 > > FW source version : 0.1 > > FW fix MMIO count : 7 > > FW fix MMIOs : > > [8f074]=00086fc0 > > [8f034]=c003b400 > > [8f004]=01a40188 > > [8f038]=c003b200 > > [8f008]=3dc43bf4 > > [8f03c]=c0033200 > > [8f00c]=40b8408c > > Hmm, yeah I see that now with hexdump as well. I think I was > accidentally looking at rkl firmware previously. Dunno how I > managed to mistyle "adls" as "rkl" though. Oh well, I'll respin > with an adls check added. I think no need and better as a follow-up to reduce CI latency. > > > FW source file name : d12adls_fw_main_0.1.d\x00-device\x00D1 > > > > > > > > > > > > > > + return true; > > > > > + > > > > > return false; > > > > > } > > > > > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dmc_regs.h b/drivers/gpu/drm/i915/display/intel_dmc_regs.h > > > > > index cf10094acae3..90d0dbb41cfe 100644 > > > > > --- a/drivers/gpu/drm/i915/display/intel_dmc_regs.h > > > > > +++ b/drivers/gpu/drm/i915/display/intel_dmc_regs.h > > > > > @@ -60,6 +60,7 @@ > > > > > > > > > > #define DMC_EVT_CTL_EVENT_ID_MASK REG_GENMASK(15, 8) > > > > > #define DMC_EVT_CTL_EVENT_ID_FALSE 0x01 > > > > > +#define DMC_EVT_CTL_EVENT_ID_VBLANK_A 0x32 /* main DMC */ > > > > > /* An event handler scheduled to run at a 1 kHz frequency. */ > > > > > #define DMC_EVT_CTL_EVENT_ID_CLK_MSEC 0xbf > > > > > > > > > > -- > > > > > 2.41.0 > > > > > > > > > > > -- > > > Ville Syrjälä > > > Intel > > -- > Ville Syrjälä > Intel