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 C85B6CE8374 for ; Tue, 1 Oct 2024 13:02:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4662D10E043; Tue, 1 Oct 2024 13:02:14 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="XEAmOd7P"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id 212D110E043 for ; Tue, 1 Oct 2024 13:02:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1727787732; x=1759323732; h=from:to:subject:in-reply-to:references:date:message-id: mime-version; bh=tOCJgXsYLL6eAODjUWpUILj5Knk086JcNp2bX8sl4yo=; b=XEAmOd7PD0vRIQBqdUOaYNu/W0MazIVvh8p++hlGA3qrJna6yRW/R87e jgR1UYprudUs/SdFjBIaNbcFWpcobTxGoD1/ZHGFko20bD8A6JSbpIRob EokThuNLQuw0ybmUZGhsr7m9ejHTus3qqB0OeETv+7cOgsIO5PY5eabrB x7DWqMQr2OOalMmeK5Bp11Ba5fblAyDjI/jBbPrh3eLfwrMWVN6eiubvT wANwWqFUD/dHOApA3W+O+aoXhtax+TvDTpw4YR/qIkY9+aKUpRU1vTRyo eWGuhiRfjKrb0C4aX1ljjy4id31XgyV4eVjFoj/KAhKy7l+63kOFmleYO A==; X-CSE-ConnectionGUID: 8L5A/N89QtCt2WdhpuyHhw== X-CSE-MsgGUID: 3EMPnabkSN+w4kbkIbQSPg== X-IronPort-AV: E=McAfee;i="6700,10204,11212"; a="49442923" X-IronPort-AV: E=Sophos;i="6.11,167,1725346800"; d="scan'208";a="49442923" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2024 06:02:12 -0700 X-CSE-ConnectionGUID: fST+LgH9RHGd5x7ATOobWw== X-CSE-MsgGUID: G8XJt+l3Qri3rzBBylwIpQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,167,1725346800"; d="scan'208";a="73276197" Received: from slindbla-desk.ger.corp.intel.com (HELO localhost) ([10.245.246.188]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2024 06:02:10 -0700 From: Jani Nikula To: Imre Deak , intel-gfx@lists.freedesktop.org Subject: Re: [PATCH v2 2/3] drm/i915/dp: Track source OUI validity explicitly In-Reply-To: <20241001123259.616486-2-imre.deak@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20241001123259.616486-1-imre.deak@intel.com> <20241001123259.616486-2-imre.deak@intel.com> Date: Tue, 01 Oct 2024 16:01:55 +0300 Message-ID: <87h69wugcc.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Tue, 01 Oct 2024, Imre Deak wrote: > While updating the source OUI on the sink the driver should avoid > writing the OUI if it's already up-to-date to prevent the sink from > resetting itself in response to the update. On eDP - the only output > type where the OUI was updated so far - the driver ensured this by > comparing the current source OUI DPCD register values with the expected > Intel OUI value, skipping the update in case of a match. On some non-eDP > sinks - at least on Synaptics branch devices - this method doesn't work, > since the source OUI DPCD registers read back as all 0, even after > updating the registers. > > Handle the above kind of sinks by tracking when the OUI was updated and > so should be valid, regardless of what the DPCD registers contain. > > This is required by the next patch updating the source OUI on non-eDP > sink types as well. > > Signed-off-by: Imre Deak > --- > drivers/gpu/drm/i915/display/g4x_dp.c | 1 + > drivers/gpu/drm/i915/display/intel_ddi.c | 1 + > .../drm/i915/display/intel_display_types.h | 1 + > drivers/gpu/drm/i915/display/intel_dp.c | 25 ++++++++++++++----- > drivers/gpu/drm/i915/display/intel_dp.h | 1 + > 5 files changed, 23 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c > index 440fb3002f286..596e926ef0894 100644 > --- a/drivers/gpu/drm/i915/display/g4x_dp.c > +++ b/drivers/gpu/drm/i915/display/g4x_dp.c > @@ -1251,6 +1251,7 @@ static void intel_dp_encoder_reset(struct drm_encoder *encoder) > intel_dp->DP = intel_de_read(display, intel_dp->output_reg); > > intel_dp->reset_link_params = true; > + intel_dp_invalidate_source_oui(intel_dp); > > if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) > vlv_pps_pipe_reset(intel_dp); > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c > index fe1ded6707f90..465f245a53c48 100644 > --- a/drivers/gpu/drm/i915/display/intel_ddi.c > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c > @@ -4392,6 +4392,7 @@ static void intel_ddi_encoder_reset(struct drm_encoder *encoder) > struct intel_digital_port *dig_port = enc_to_dig_port(to_intel_encoder(encoder)); > > intel_dp->reset_link_params = true; > + intel_dp_invalidate_source_oui(intel_dp); > > intel_pps_encoder_reset(intel_dp); > > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h > index 7ff97e5b83dd5..ad84ffa31c97f 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_types.h > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h > @@ -1757,6 +1757,7 @@ struct intel_dp { > > /* When we last wrote the OUI for eDP */ > unsigned long last_oui_write; > + bool oui_valid; > > bool colorimetry_support; > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > index b7661529f1927..2d6ffbeae07a0 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -3335,31 +3335,43 @@ void intel_dp_sink_disable_decompression(struct intel_atomic_state *state, > } > > static void > -intel_edp_init_source_oui(struct intel_dp *intel_dp, bool careful) > +intel_dp_init_source_oui(struct intel_dp *intel_dp) > { > struct drm_i915_private *i915 = dp_to_i915(intel_dp); > u8 oui[] = { 0x00, 0xaa, 0x01 }; > u8 buf[3] = {}; > > + if (!intel_dp_is_edp(intel_dp)) > + return; > + > /* > * During driver init, we want to be careful and avoid changing the source OUI if it's > * already set to what we want, so as to avoid clearing any state by accident > */ > - if (careful) { > + if (!intel_dp->oui_valid) { > if (drm_dp_dpcd_read(&intel_dp->aux, DP_SOURCE_OUI, buf, sizeof(buf)) < 0) > drm_err(&i915->drm, "Failed to read source OUI\n"); > > if (memcmp(oui, buf, sizeof(oui)) == 0) { > /* Assume the OUI was written now. */ > intel_dp->last_oui_write = jiffies; > - return; > + intel_dp->oui_valid = true; > } > } > > + if (intel_dp->oui_valid) > + return; > + > if (drm_dp_dpcd_write(&intel_dp->aux, DP_SOURCE_OUI, oui, sizeof(oui)) < 0) > drm_err(&i915->drm, "Failed to write source OUI\n"); > > intel_dp->last_oui_write = jiffies; > + intel_dp->oui_valid = true; Looking at patches 1 and 2, I'm thinking we don't need two members for this. Just make intel_dp->last_oui_write == 0 mean "invalid". BR, Jani. > +} > + > +void intel_dp_invalidate_source_oui(struct intel_dp *intel_dp) > +{ > + intel_dp->oui_valid = false; > } > > void intel_dp_wait_source_oui(struct intel_dp *intel_dp) > @@ -3390,6 +3402,8 @@ void intel_dp_set_power(struct intel_dp *intel_dp, u8 mode) > if (downstream_hpd_needs_d0(intel_dp)) > return; > > + intel_dp_invalidate_source_oui(intel_dp); > + > ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, mode); > } else { > struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp); > @@ -3397,8 +3411,7 @@ void intel_dp_set_power(struct intel_dp *intel_dp, u8 mode) > lspcon_resume(dp_to_dig_port(intel_dp)); > > /* Write the source OUI as early as possible */ > - if (intel_dp_is_edp(intel_dp)) > - intel_edp_init_source_oui(intel_dp, false); > + intel_dp_init_source_oui(intel_dp); > > /* > * When turning on, we need to retry for 1ms to give the sink > @@ -4115,7 +4128,7 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp, struct intel_connector *connector > * If needed, program our source OUI so we can make various Intel-specific AUX services > * available (such as HDR backlight controls) > */ > - intel_edp_init_source_oui(intel_dp, true); > + intel_dp_init_source_oui(intel_dp); > > return true; > } > diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h > index 3b869429e5756..0449d1d3f175d 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.h > +++ b/drivers/gpu/drm/i915/display/intel_dp.h > @@ -189,6 +189,7 @@ void intel_dp_check_frl_training(struct intel_dp *intel_dp); > void intel_dp_pcon_dsc_configure(struct intel_dp *intel_dp, > const struct intel_crtc_state *crtc_state); > > +void intel_dp_invalidate_source_oui(struct intel_dp *intel_dp); > void intel_dp_wait_source_oui(struct intel_dp *intel_dp); > int intel_dp_output_bpp(enum intel_output_format output_format, int bpp); -- Jani Nikula, Intel