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 X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C8D1C4363D for ; Tue, 22 Sep 2020 18:47:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC36520756 for ; Tue, 22 Sep 2020 18:47:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="It/q6b19" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726739AbgIVSrn (ORCPT ); Tue, 22 Sep 2020 14:47:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726563AbgIVSrn (ORCPT ); Tue, 22 Sep 2020 14:47:43 -0400 Received: from mail-il1-x142.google.com (mail-il1-x142.google.com [IPv6:2607:f8b0:4864:20::142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AF85C061755 for ; Tue, 22 Sep 2020 11:47:43 -0700 (PDT) Received: by mail-il1-x142.google.com with SMTP id s88so18332264ilb.6 for ; Tue, 22 Sep 2020 11:47:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=YxXbuF6hBJzfTWRt5DAEmfKwWloYHZy+sSnV2z24i2E=; b=It/q6b19ZASi47H1K/g2WvFY9UgqkwXrZHRYpvVl4iGTrYSzRIIQfmZeC9oh4OGlQy Gxs2B33xh/cYHd1VidpABYcMym1aQLTB/DvfFJHw+ENY96n+/P9qNkBreBdEkRtNDhNf uATTtJ03PiWRJ3hs5OOCKezfUzG9t/UlqLUlQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=YxXbuF6hBJzfTWRt5DAEmfKwWloYHZy+sSnV2z24i2E=; b=gh8g3tQdd7Q7qvA9zyXNkN6WPamS74sktE/NtRBEi66hUlUDDopUKkscvBe1DdGLLU 0uC7LFfH0OIUsUBRMXgJ4ofko8XR+QIYYGh9/reZK29SADfO6xWRkvFd1Y/6KrTMH7RW SVstXpinI5zIICw45v0qODHyc4QIftpTSFKNHaEewuNhYrlRWDI9UXtPX2iYFOUXn63m 5XKwa/oKnxxTCKM+kYQU7tEEEbXESHN9Rhtd06aqPXzhogwls1sly0ha49qaYjYX/4b+ FaOeWJ6/sgLgy4t21rQYo91O2WrW9obSbabeT8bXvmrfvozW/NA1vqb/xC22a1q7onr6 Kxwg== X-Gm-Message-State: AOAM531/zeI0uRErfMfoTquplP4ox/1lrQ27I9RyB3h1rOh/g95vHxsE dgfEFcXqBRgv7zdHhZxEZeWqLZyFaNXEtn2f8QVa/YQ0KdI= X-Google-Smtp-Source: ABdhPJy+GcNdew21VskNlbcEkD+F5Cq06615axgPEAP2aVa9VSLU2Hezbcm0dZ4Xk3q6VaSyG74SCTRJeWHi37VYbEc= X-Received: by 2002:a92:aa86:: with SMTP id p6mr5386297ill.157.1600800462207; Tue, 22 Sep 2020 11:47:42 -0700 (PDT) MIME-Version: 1.0 References: <20200917110838.1.I63d52f5b96d7e81e1e2dc2a72c4bf5fd84d3d3d0@changeid> <87o8m4uxcn.fsf@intel.com> <20200917182535.GC6112@intel.com> <20200917201102.GD6112@intel.com> In-Reply-To: From: Kevin Chowski Date: Tue, 22 Sep 2020 12:47:31 -0600 Message-ID: Subject: Re: [Intel-gfx] [PATCH] i915: Introduce quirk for shifting eDP brightness. To: Puthikorn Voravootivat Cc: =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= , David Airlie , intel-gfx , LKML , dri-devel@lists.freedesktop.org, Wambui Karuga Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Alrighty, I'll take everyone else's silence as tacit approval of Ville's opinions. (I didn't receive any email bounces this time, so I think my issue was transient.) I will start on inverting the quirk and making the most-significant-alignment matter for these registers by default. Who can help me gather a list of OUIs that we need to add to the quirk? I can follow up with Puthikorn about the relevant Chromebooks, but I don't know what other types of laptops are using this driver. Thanks for your time, Kevin Chowski On Fri, Sep 18, 2020 at 12:16 PM Puthikorn Voravootivat wrote: > > I'll defer to Ville & Lyude. > > I dug up more on the bug report and found that both Thinkpad and > Galaxy Chromebook use the same Samsung OLED. > So my 2 vs 1 argument is actually not valid. > > On Fri, Sep 18, 2020 at 10:59 AM Kevin Chowski wro= te: > > > > Apologies once again, some of my emails were bouncing for some > > addresses yesterday. Hopefully it was a temporary condition; I'll > > continue trying to dig into it on my end if it happens again for this > > email. > > > > Since there's evidence that some models want lsb and some (well, at > > least one) want msb, my understanding is that we'll need a quirk one > > way or the other (please correct if I'm mistaken). I unfortunately > > don't have the ability to test anything other than the Pixelbook, so > > if we decide the msb is the "right" way, then I will have to rely on > > others to test (and find the OUI of) other models which require lsb. > > > > I am happy to make any changes requested, but I do not at all have > > enough background here to make the decision on whether the msb > > functionality deserves the quirk or if the lsb one does. How can I > > help you all come to an agreement here? > > > > * It seems like Ville feels strongly about the msb being the correct > > interpretation of the spec. > > * It's unclear to me on which side of the fence Lyude falls, I > > couldn't pick up a strong opinion in her clarifying question. > > * Puthikorn seems to be on the side of lsb being correct, but maybe > > was swayed by Ville's argument. > > > > If no one feels that Ville's argument is not strong in some way, and > > we go with that, I will get to work on the requested changes. I am > > concerned, though, about changing the default functionality without > > testing it widely to find the set of laptops which require the lsb > > quirk. I'd appreciate any advice people might have about making this > > change safely. > > > > Thank you for your time, > > Kevin > > > > On Thu, Sep 17, 2020 at 2:11 PM Ville Syrj=C3=A4l=C3=A4 > > wrote: > > > > > > On Thu, Sep 17, 2020 at 09:25:35PM +0300, Ville Syrj=C3=A4l=C3=A4 wro= te: > > > > On Thu, Sep 17, 2020 at 11:14:43AM -0700, Puthikorn Voravootivat wr= ote: > > > > > The Lyude fde7266fb2f6 change is actually based on Chromium chang= e > > > > > (https://crrev.com/c/1650325) that fixes the brightness for Samsu= ng > > > > > Galaxy Chromebook. So currently we have 2 examples that use LSB > > > > > interpretation and 1 that use MSB. > > > > > > > > "If field 4:0 of the EDP_PWMGEN_BIT_COUNT register represents a val= ue > > > > of greater than 8 and the BACKLIGHT_BRIGHTNESS_BYTE_COUNT bit > > > > is cleared to 0, only the 8 MSB of the brightness control value can= be > > > > controlled. > > > > (See Note below.) > > > > Assigned bits are allocated to the MSB of the enabled register > > > > combination." > > > > > > > > I think that's pretty clear the assigned bits are supposed to be > > > > msb aligned. > > > > > > I guess there's some email issues happening, but just to clarify: > > > > > > When the spec says MSB in caps here it clearly means > > > "most significant-bit(s)" since otherwise "8 MSB" would not make > > > any sense in the context of a 2 byte value. > > > > > > Granted the spec is crap here since "Table 1-1: Acronyms and > > > Initialism" does claim "MSB" should be byte(s) and "msb" bit(s). > > > > > > Also I can't imagine anyone would allocate the bits starting > > > from the lsb when the whole thing is clearly supposed to be a > > > 16bit big endian integer. So with >8 assigned bits you'd end > > > up with crazy stuff like this: > > > > > > [ 7 ... 0 ][7 ... 0] > > > [ 8 MSB ][XXXX][N LSB] > > > > > > so you couldn't even treat the value as a regular big endian > > > thing. Instead, if you squint a bit, it now looks like a funky > > > little endian value. So we're deep into some mixed endian land > > > where nothing makes sense anymore. > > > > > > Anyways I think the code should simply do this to match the spec: > > > u16 value =3D brightness << (16 - num_assigned_bits); > > > val[0] =3D value >> 8; > > > val[1] =3D value & 0xff; > > > > > > > > > > > > > > > > > > > > > > > > > On Thu, Sep 17, 2020 at 10:55 AM Kevin Chowski wrote: > > > > > > > > > > > > Apologies for being too vague. To be as precise I can be, here = is the > > > > > > specific code delta I tested: https://crrev.com/c/2406616 . To = answer > > > > > > your other question, the code I tested against is indeed includ= ing the > > > > > > fde7266fb2f6 (despite ostensibly being called 5.4 in my commit > > > > > > message): our current top-of-tree for our 5.4 branch includes t= he > > > > > > intel_dp_aux_calc_max_backlight logic. Further, I'll note that = change > > > > > > is exactly the change which breaks my Pixelbook model: prior to= the > > > > > > change, the max_brightness was hard-coded to 0xFFFF and the mat= h > > > > > > worked out that it didn't matter that the hardware cared about = the MSB > > > > > > despite the driver code caring about the LSB. > > > > > > > > > > > > To answer Ville's question: the fde7266fb2f6 change which fixes= one > > > > > > laptop (I believe Thinkpad X1 extreme Gen 2, from some bug repo= rts I > > > > > > dug up) and breaks another (Pixelbook); so unfortunately I beli= eve we > > > > > > need a quirk at least for some laptop. Reading through the copy= of the > > > > > > datasheet I have, it wasn't clear to me which was the correct > > > > > > interpretation. I'm cc'ing puthik@, who was leaning toward the = current > > > > > > kernel code (caring about LSB) being the correct interpretation= . I > > > > > > believe we have other chromebooks which do rely on LSB function= ality, > > > > > > so unless we can find more examples of laptops wanting MSB it > > > > > > currently looks like Pixelbook is the outlier. > > > > > > > > > > > > On Thu, Sep 17, 2020 at 11:28 AM Jani Nikula > > > > > > wrote: > > > > > > > > > > > > > > On Thu, 17 Sep 2020, Kevin Chowski wro= te: > > > > > > > > We have observed that Google Pixelbook's backlight hardware= is > > > > > > > > interpretting these backlight bits from the most-significan= t side of the > > > > > > > > 16 bit word (if DP_EDP_PWMGEN_BIT_COUNT < 16), whereas the = driver code > > > > > > > > assumes the peripheral cares about the least-significant bi= ts. > > > > > > > > > > > > > > > > Testing was done from within Chrome OS's build environment = when the > > > > > > > > patch is backported to 5.4 (the version we are newly target= ing for the > > > > > > > > Pixelbook); for the record: > > > > > > > > $ emerge-eve-kernelnext sys-kernel/chromeos-kernel-5_4 &= & \ > > > > > > > > ./update_kernel.sh --remote=3D$IP > > > > > > > > > > > > > > > > I used `/sys/kernel/debug/dri/0/eDP-1/i915_dpcd` on my lapt= op to verify > > > > > > > > that the registers were being set according to what the act= ual hardware > > > > > > > > expects; I also observe that the backlight is noticeably br= ighter with > > > > > > > > this patch. > > > > > > > > > > > > > > It's unclear to me what kernel version this is against, and w= hat you've > > > > > > > actually tested. > > > > > > > > > > > > > > Have you tried v5.7 kernel with Lyude's fde7266fb2f6 ("drm/i9= 15: Fix eDP > > > > > > > DPCD aux max backlight calculations")? > > > > > > > > > > > > > > I just want to make sure you've tested with all the relevant = fixes > > > > > > > before adding quirks. > > > > > > > > > > > > > > BR, > > > > > > > Jani. > > > > > > > > > > > > > > > > > > > > > > > Signed-off-by: Kevin Chowski > > > > > > > > --- > > > > > > > > > > > > > > > > .../drm/i915/display/intel_dp_aux_backlight.c | 34 +++++++= ++++++++++++ > > > > > > > > drivers/gpu/drm/i915/display/intel_quirks.c | 13 +++++++ > > > > > > > > drivers/gpu/drm/i915/i915_drv.h | 1 + > > > > > > > > 3 files changed, 48 insertions(+) > > > > > > > > > > > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_back= light.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > > > > > > > > index acbd7eb66cbe3..99c98f217356d 100644 > > > > > > > > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > > > > > > > > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > > > > > > > > @@ -91,6 +91,23 @@ static u32 intel_dp_aux_get_backlight(st= ruct intel_connector *connector) > > > > > > > > if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNE= SS_BYTE_COUNT) > > > > > > > > level =3D (read_val[0] << 8 | read_val[1]); > > > > > > > > > > > > > > > > + if (i915->quirks & QUIRK_SHIFT_EDP_BACKLIGHT_BRIGHTNE= SS) { > > > > > > > > + if (!drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP= _PWMGEN_BIT_COUNT, > > > > > > > > + &read_val[0])= ) { > > > > > > > > + DRM_DEBUG_KMS("Failed to read DPCD re= gister 0x%x\n", > > > > > > > > + DP_EDP_PWMGEN_BIT_COU= NT); > > > > > > > > + return 0; > > > > > > > > + } > > > > > > > > + // Only bits 4:0 are used, 7:5 are reserved. > > > > > > > > + read_val[0] =3D read_val[0] & 0x1F; > > > > > > > > + if (read_val[0] > 16) { > > > > > > > > + DRM_DEBUG_KMS("Invalid DP_EDP_PWNGEN_= BIT_COUNT 0x%X, expected at most 16\n", > > > > > > > > + read_val[0]); > > > > > > > > + return 0; > > > > > > > > + } > > > > > > > > + level >>=3D 16 - read_val[0]; > > > > > > > > + } > > > > > > > > + > > > > > > > > return level; > > > > > > > > } > > > > > > > > > > > > > > > > @@ -106,6 +123,23 @@ intel_dp_aux_set_backlight(const struc= t drm_connector_state *conn_state, u32 lev > > > > > > > > struct drm_i915_private *i915 =3D dp_to_i915(intel_dp= ); > > > > > > > > u8 vals[2] =3D { 0x0 }; > > > > > > > > > > > > > > > > + if (i915->quirks & QUIRK_SHIFT_EDP_BACKLIGHT_BRIGHTNE= SS) { > > > > > > > > + if (!drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP= _PWMGEN_BIT_COUNT, > > > > > > > > + &vals[0])) { > > > > > > > > + DRM_DEBUG_KMS("Failed to write aux ba= cklight level: Failed to read DPCD register 0x%x\n", > > > > > > > > + DP_EDP_PWMGEN_BIT_C= OUNT); > > > > > > > > + return; > > > > > > > > + } > > > > > > > > + // Only bits 4:0 are used, 7:5 are reserved. > > > > > > > > + vals[0] =3D vals[0] & 0x1F; > > > > > > > > + if (vals[0] > 16) { > > > > > > > > + DRM_DEBUG_KMS("Failed to write aux ba= cklight level: Invalid DP_EDP_PWNGEN_BIT_COUNT 0x%X, expected at most 16\n"= , > > > > > > > > + vals[0]); > > > > > > > > + return; > > > > > > > > + } > > > > > > > > + level <<=3D (16 - vals[0]) & 0xFFFF; > > > > > > > > + } > > > > > > > > + > > > > > > > > vals[0] =3D level; > > > > > > > > > > > > > > > > /* Write the MSB and/or LSB */ > > > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/= drivers/gpu/drm/i915/display/intel_quirks.c > > > > > > > > index 46beb155d835f..63b27d49b2864 100644 > > > > > > > > --- a/drivers/gpu/drm/i915/display/intel_quirks.c > > > > > > > > +++ b/drivers/gpu/drm/i915/display/intel_quirks.c > > > > > > > > @@ -53,6 +53,16 @@ static void quirk_increase_ddi_disabled_= time(struct drm_i915_private *i915) > > > > > > > > drm_info(&i915->drm, "Applying Increase DDI Disabled = quirk\n"); > > > > > > > > } > > > > > > > > > > > > > > > > +/* > > > > > > > > + * Some eDP backlight hardware uses the most-significant b= its of the brightness > > > > > > > > + * register, so brightness values must be shifted first. > > > > > > > > + */ > > > > > > > > +static void quirk_shift_edp_backlight_brightness(struct dr= m_i915_private *i915) > > > > > > > > +{ > > > > > > > > + i915->quirks |=3D QUIRK_SHIFT_EDP_BACKLIGHT_BRIGHTNES= S; > > > > > > > > + DRM_INFO("Applying shift eDP backlight brightness qui= rk\n"); > > > > > > > > +} > > > > > > > > + > > > > > > > > struct intel_quirk { > > > > > > > > int device; > > > > > > > > int subsystem_vendor; > > > > > > > > @@ -156,6 +166,9 @@ static struct intel_quirk intel_quirks[= ] =3D { > > > > > > > > /* ASRock ITX*/ > > > > > > > > { 0x3185, 0x1849, 0x2212, quirk_increase_ddi_disabled= _time }, > > > > > > > > { 0x3184, 0x1849, 0x2212, quirk_increase_ddi_disabled= _time }, > > > > > > > > + > > > > > > > > + /* Google Pixelbook */ > > > > > > > > + { 0x591E, 0x8086, 0x2212, quirk_shift_edp_backlight_b= rightness }, > > > > > > > > }; > > > > > > > > > > > > > > > > void intel_init_quirks(struct drm_i915_private *i915) > > > > > > > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/= drm/i915/i915_drv.h > > > > > > > > index e4f7f6518945b..cc93bede4fab8 100644 > > > > > > > > --- a/drivers/gpu/drm/i915/i915_drv.h > > > > > > > > +++ b/drivers/gpu/drm/i915/i915_drv.h > > > > > > > > @@ -525,6 +525,7 @@ struct i915_psr { > > > > > > > > #define QUIRK_PIN_SWIZZLED_PAGES (1<<5) > > > > > > > > #define QUIRK_INCREASE_T12_DELAY (1<<6) > > > > > > > > #define QUIRK_INCREASE_DDI_DISABLED_TIME (1<<7) > > > > > > > > +#define QUIRK_SHIFT_EDP_BACKLIGHT_BRIGHTNESS (1<<8) > > > > > > > > > > > > > > > > struct intel_fbdev; > > > > > > > > struct intel_fbc_work; > > > > > > > > > > > > > > -- > > > > > > > Jani Nikula, Intel Open Source Graphics Center > > > > > > > > -- > > > > Ville Syrj=C3=A4l=C3=A4 > > > > Intel > > > > _______________________________________________ > > > > Intel-gfx mailing list > > > > Intel-gfx@lists.freedesktop.org > > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx > > > > > > -- > > > Ville Syrj=C3=A4l=C3=A4 > > > Intel 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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 587D7C4741F for ; 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Tue, 22 Sep 2020 11:47:42 -0700 (PDT) MIME-Version: 1.0 References: <20200917110838.1.I63d52f5b96d7e81e1e2dc2a72c4bf5fd84d3d3d0@changeid> <87o8m4uxcn.fsf@intel.com> <20200917182535.GC6112@intel.com> <20200917201102.GD6112@intel.com> In-Reply-To: From: Kevin Chowski Date: Tue, 22 Sep 2020 12:47:31 -0600 Message-ID: Subject: Re: [Intel-gfx] [PATCH] i915: Introduce quirk for shifting eDP brightness. To: Puthikorn Voravootivat X-Mailman-Approved-At: Wed, 23 Sep 2020 07:53:20 +0000 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: , Cc: David Airlie , intel-gfx , LKML , dri-devel@lists.freedesktop.org, Wambui Karuga Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" QWxyaWdodHksIEknbGwgdGFrZSBldmVyeW9uZSBlbHNlJ3Mgc2lsZW5jZSBhcyB0YWNpdCBhcHBy b3ZhbCBvZgpWaWxsZSdzIG9waW5pb25zLiAoSSBkaWRuJ3QgcmVjZWl2ZSBhbnkgZW1haWwgYm91 bmNlcyB0aGlzIHRpbWUsIHNvIEkKdGhpbmsgbXkgaXNzdWUgd2FzIHRyYW5zaWVudC4pIEkgd2ls bCBzdGFydCBvbiBpbnZlcnRpbmcgdGhlIHF1aXJrIGFuZAptYWtpbmcgdGhlIG1vc3Qtc2lnbmlm aWNhbnQtYWxpZ25tZW50IG1hdHRlciBmb3IgdGhlc2UgcmVnaXN0ZXJzIGJ5CmRlZmF1bHQuCgpX aG8gY2FuIGhlbHAgbWUgZ2F0aGVyIGEgbGlzdCBvZiBPVUlzIHRoYXQgd2UgbmVlZCB0byBhZGQg 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(mail-il1-x144.google.com [IPv6:2607:f8b0:4864:20::144]) by gabe.freedesktop.org (Postfix) with ESMTPS id F30796E2BC for ; Tue, 22 Sep 2020 18:47:42 +0000 (UTC) Received: by mail-il1-x144.google.com with SMTP id t18so18349183ilp.5 for ; Tue, 22 Sep 2020 11:47:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=YxXbuF6hBJzfTWRt5DAEmfKwWloYHZy+sSnV2z24i2E=; b=It/q6b19ZASi47H1K/g2WvFY9UgqkwXrZHRYpvVl4iGTrYSzRIIQfmZeC9oh4OGlQy Gxs2B33xh/cYHd1VidpABYcMym1aQLTB/DvfFJHw+ENY96n+/P9qNkBreBdEkRtNDhNf uATTtJ03PiWRJ3hs5OOCKezfUzG9t/UlqLUlQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=YxXbuF6hBJzfTWRt5DAEmfKwWloYHZy+sSnV2z24i2E=; b=fJlOmQll0rePela/PMKm6TF9ipsl4Fvs2U+gKsaSZ22CFzapcxS+TD7kXxEpEM+O2A SPs/VrH7SM/X0aZL2rOqhP9/K7ES6TlpluTmQ8LZP3vO5iZM+OFDfipfRYRCzP41wfRi 2/Heyb+zbMMc2z5feuUMqwyshBgySMSCwoYxCeunfT9HRi1BZaY8EAgzjEiJsyB7urUV U2bLRqDVReTljfVPa1Qis9BrNX7lCIYbeCNQGJU7z1SKQj3tcoHg3ZFp5YoZwITbID42 YOUgSSGBlgT/D6hYxLmABjQp5as53KTxnYDR2M4XNNCUYKydhuhisv2N+N2bMV39tvy3 us9w== X-Gm-Message-State: AOAM530xqNUtEw9dhiY6Tzmp2DO4dcecdjC9yqGO+iNN4R9AnyRqBpbl TOKihp4INO9Ohyx8fhNyKqq4Re7+Z5fytLrVTb8H1w== X-Google-Smtp-Source: ABdhPJy+GcNdew21VskNlbcEkD+F5Cq06615axgPEAP2aVa9VSLU2Hezbcm0dZ4Xk3q6VaSyG74SCTRJeWHi37VYbEc= X-Received: by 2002:a92:aa86:: with SMTP id p6mr5386297ill.157.1600800462207; Tue, 22 Sep 2020 11:47:42 -0700 (PDT) MIME-Version: 1.0 References: <20200917110838.1.I63d52f5b96d7e81e1e2dc2a72c4bf5fd84d3d3d0@changeid> <87o8m4uxcn.fsf@intel.com> <20200917182535.GC6112@intel.com> <20200917201102.GD6112@intel.com> In-Reply-To: From: Kevin Chowski Date: Tue, 22 Sep 2020 12:47:31 -0600 Message-ID: To: Puthikorn Voravootivat Subject: Re: [Intel-gfx] [PATCH] i915: Introduce quirk for shifting eDP brightness. 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