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 973B6C433EF for ; Fri, 11 Mar 2022 17:02:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2F47F10E199; Fri, 11 Mar 2022 17:02:51 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id AF2DD10E199 for ; Fri, 11 Mar 2022 17:02:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1647018169; x=1678554169; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=oP5l2N/QHAJdBOIeC7EbQTEv8OmmNB8wg5QtDfCN4is=; b=JNpHel6V9CFayrrEHxBopPIN0e/rTWWP4LX8jinTlrEjFgqmxC7GRXf8 OSAN24PXgcf3GTeFw0MWmGtMzpma7JyaUB7dAWl76vVuqboos4v125KXg 0nWmFKM0Tuw9viuwWdiAkyzyUBT+N5Saa3q3g4wgbJBYWzsVatxyJCg47 fUHahCmLFSoAS9ELRKIEsa+rr5eew7NFTsGVlAyO2kVe9g/zNthaQsiEC 9l+C1g4pgJIa/KcAl63yd1OoSs1s4SvL/12kLcGXzasLXXigOw2XvNnlK HaWfBjlnPSjMsYQxChlw5ONJTHVL1mG6wOAHtuTaxY6AxIuQBMBH3za/x A==; X-IronPort-AV: E=McAfee;i="6200,9189,10283"; a="253173124" X-IronPort-AV: E=Sophos;i="5.90,174,1643702400"; d="scan'208";a="253173124" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Mar 2022 09:02:49 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,174,1643702400"; d="scan'208";a="643037153" Received: from stinkpipe.fi.intel.com (HELO stinkbox) ([10.237.72.151]) by fmsmga002.fm.intel.com with SMTP; 11 Mar 2022 09:02:46 -0800 Received: by stinkbox (sSMTP sendmail emulation); Fri, 11 Mar 2022 19:02:45 +0200 Date: Fri, 11 Mar 2022 19:02:45 +0200 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: "Souza, Jose" Message-ID: References: <20220310200518.247909-1-jose.souza@intel.com> <7d46f07565b6d25b1f71c16051273f76def2e838.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7d46f07565b6d25b1f71c16051273f76def2e838.camel@intel.com> X-Patchwork-Hint: comment Subject: Re: [Intel-gfx] [PATCH 1/2] drm/i915/display: Fix HPD short pulse handling for eDP 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: "Nikula, Jani" , "intel-gfx@lists.freedesktop.org" Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Fri, Mar 11, 2022 at 01:05:49PM +0000, Souza, Jose wrote: > On Thu, 2022-03-10 at 23:52 +0200, Ville Syrjälä wrote: > > On Thu, Mar 10, 2022 at 12:05:17PM -0800, José Roberto de Souza wrote: > > > Commit 13ea6db2cf24 ("drm/i915/edp: Ignore short pulse when panel > > > powered off") completely broke short pulse handling for eDP as it is > > > usually generated by sink when it is displaying image and there is > > > some error or status that source needs to handle. > > > > > > When power panel is enabled, this state is enough to power aux > > > transactions and VDD override is disabled, so intel_pps_have_power() > > > is always returning false causing short pulses to be ignored. > > > > I think the times that we use the vdd override should be > > limited to: > > - aux transfers while the display off > > - potentially short periods of time during the modeset sequence > > > > So I guess what you're saying here is that during those times > > some panel is triggering an IRQ_HPD which, if ignored, causes > > some problem for us? > > No, not in those times. > When panel is on scanning out frames, PPS is enabled and VDD is disabled. > So any short pulse HPD was being ignored because (edp_have_panel_power() && edp_have_panel_vdd()) is always false. > > > > > > > > > So here better naming this function that intends to check if aux > > > lines are powered to avoid the endless cycle mentioned in the commit > > > being fixed and fixing the check for what it is intended. > > > > > > Fixes: 13ea6db2cf24 ("drm/i915/edp: Ignore short pulse when panel powered off") > > > Cc: Anshuman Gupta > > > Cc: Jani Nikula > > > Cc: Uma Shankar > > > Cc: Ville Syrjälä > > > Signed-off-by: José Roberto de Souza > > > --- > > > drivers/gpu/drm/i915/display/intel_dp.c | 2 +- > > > drivers/gpu/drm/i915/display/intel_pps.c | 4 ++-- > > > drivers/gpu/drm/i915/display/intel_pps.h | 2 +- > > > 3 files changed, 4 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > > > index 619546441eae5..b029b064000d6 100644 > > > --- a/drivers/gpu/drm/i915/display/intel_dp.c > > > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > > > @@ -4867,7 +4867,7 @@ intel_dp_hpd_pulse(struct intel_digital_port *dig_port, bool long_hpd) > > > struct intel_dp *intel_dp = &dig_port->dp; > > > > > > if (dig_port->base.type == INTEL_OUTPUT_EDP && > > > - (long_hpd || !intel_pps_have_power(intel_dp))) { > > > + (long_hpd || !intel_pps_have_vdd_power(intel_dp))) { > > > /* > > > * vdd off can generate a long/short pulse on eDP which > > > * would require vdd on to handle it, and thus we > > > diff --git a/drivers/gpu/drm/i915/display/intel_pps.c b/drivers/gpu/drm/i915/display/intel_pps.c > > > index 9c986e8932f87..d3e6083ad5b79 100644 > > > --- a/drivers/gpu/drm/i915/display/intel_pps.c > > > +++ b/drivers/gpu/drm/i915/display/intel_pps.c > > > @@ -1075,13 +1075,13 @@ static void intel_pps_vdd_sanitize(struct intel_dp *intel_dp) > > > edp_panel_vdd_schedule_off(intel_dp); > > > } > > > > > > -bool intel_pps_have_power(struct intel_dp *intel_dp) > > > +bool intel_pps_have_vdd_power(struct intel_dp *intel_dp) > > > { > > > intel_wakeref_t wakeref; > > > bool have_power = false; > > > > > > with_intel_pps_lock(intel_dp, wakeref) { > > > - have_power = edp_have_panel_power(intel_dp) && Ah, that s/&&/||/ is the bug you're fixing. I didn't even notice, probably because of the broken indentation in the code here. I just read it and thought it only checks for panel power and not vdd. Can you also fix up the indentation a bit so the code doesn't look so weird? I think I'd call the function intel_pps_have_panel_power_or_vdd() (or something along those lines) to make it clear what it does. Reviewed-by: Ville Syrjälä > > > + have_power = edp_have_panel_power(intel_dp) || > > > edp_have_panel_vdd(intel_dp); > > > } > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_pps.h b/drivers/gpu/drm/i915/display/intel_pps.h > > > index fbb47f6f453e4..948523ce32417 100644 > > > --- a/drivers/gpu/drm/i915/display/intel_pps.h > > > +++ b/drivers/gpu/drm/i915/display/intel_pps.h > > > @@ -37,7 +37,7 @@ void intel_pps_vdd_on(struct intel_dp *intel_dp); > > > void intel_pps_on(struct intel_dp *intel_dp); > > > void intel_pps_off(struct intel_dp *intel_dp); > > > void intel_pps_vdd_off_sync(struct intel_dp *intel_dp); > > > -bool intel_pps_have_power(struct intel_dp *intel_dp); > > > +bool intel_pps_have_vdd_power(struct intel_dp *intel_dp); > > > void intel_pps_wait_power_cycle(struct intel_dp *intel_dp); > > > > > > void intel_pps_init(struct intel_dp *intel_dp); > > > -- > > > 2.35.1 > > > -- Ville Syrjälä Intel