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Fri, 28 Aug 2026 01:24:57 -0700 (PDT) X-Received: by 2002:a17:903:2f0d:b0:2c9:aae1:a61a with SMTP id d9443c01a7336-2d74e07003dmr102114855ad.14.1787905496507; Fri, 28 Aug 2026 01:24:56 -0700 (PDT) Received: from [10.206.96.212] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3286f784845sm3991921eec.2.2026.08.28.01.24.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Aug 2026 01:24:55 -0700 (PDT) Message-ID: Date: Fri, 28 Aug 2026 13:54:49 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Arpit Saini Subject: Re: [PATCH v2 2/4] arm64: dts: qcom: shikra-cqm-evk: Enable display and add ili7807s panel To: Dmitry Baryshkov Cc: Konrad Dybcio , Nabige Aala , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260706-shikra-dt-changes-v2-2-56fcd1659ea4@oss.qualcomm.com> <8a3cc857-0b1c-4bd5-a5ce-a564823ca614@oss.qualcomm.com> <6f8d8cf5-1e35-4d45-b2c1-6f36ac51ad4a@oss.qualcomm.com> <4efaa8d7-56c8-4581-a161-51abb319bdcf@oss.qualcomm.com> <6c89ef9d-3551-4b92-904c-316dbcffcfbd@oss.qualcomm.com> <15957c47-f8bc-4d92-a6b4-88c9a546d807@oss.qualcomm.com> <29ca6303-4368-4aeb-b82f-039aa252780a@oss.qualcomm.com> Content-Language: en-US In-Reply-To: <29ca6303-4368-4aeb-b82f-039aa252780a@oss.qualcomm.com> Content-Type: text/plain; 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Happy to make further changes if needed. Thanks for your time!. It was great meeting you in person Thanks, Arpit On 7/28/2026 11:14 AM, Arpit Saini wrote: > Hi Dmitry, > > On 7/22/2026 3:57 AM, Dmitry Baryshkov wrote: >> On Tue, Jul 21, 2026 at 02:35:42PM +0530, Arpit Saini wrote: >>> Hi Dmitry, >>> >>> On 7/20/2026 6:35 PM, Dmitry Baryshkov wrote: >>>> On Mon, Jul 20, 2026 at 05:37:25PM +0530, Arpit Saini wrote: >>>>> Hi Konrad, >>>>> >>>>> On 7/16/2026 11:21 PM, Konrad Dybcio wrote: >>>>>> On 7/14/26 9:21 AM, Arpit Saini wrote: >>>>>>> Hi Dmitry,Konrad >>>>>>> >>>>>>> On 7/10/2026 6:09 PM, Dmitry Baryshkov wrote: >>>>>>>> On Fri, Jul 10, 2026 at 05:28:04PM +0530, Arpit Saini wrote: >>>>>>>>> Hi Konrad, >>>>>>>>> >>>>>>>>> On 7/10/2026 2:31 PM, Arpit Saini wrote: >>>>>> >>>>>> [...] >>>>>> >>>>>>>>> Normally the backlight EN pin is controlled by a backlight driver. >>>>>>>>> >>>>>>>>> However, this panel uses MIPI DCS based backlight control with no >>>>>>>>> >>>>>>>>> separate backlight driver. Since there is no driver to assert gpio91, >>>>>>>>> >>>>>>>>> we control it via the panel's pinctrl default state.. >>>>>>>>> >>>>>>>>> So this is platform specific pin , we need this to enable/disable >>>>>>>>> >>>>>>>>> the backlight. >>>>>>>> >>>>>>>> Handle it from the panel driver. Also please fix your editor to prevent >>>>>>>> it from inserting extra empty lines. >>>>>>>> >>>>>>> >>>>>>> Earlier I handled it through panel driver, but this GPIO is specific to our >>>>>>> Qualcomm Daughter Card, it is not going to the panel connector. >>>>>> >>>>>> So is it an enable pin of a voltage regulator maybe? I'm having trouble >>>>>> understanding how this is all tied together, given the panel driver >>>>>> uses DCS commands to control the backlight status >>>>>> >>>>>> Konrad >>>>> >>>>> No, it is not a voltage regulator enable. >>>>> GPIO91 (WLED_P1_EN) is the enable pin of the WLED driver IC on the Qualcomm daughter card. >>>>> The WLED driver is a boost LED driver that powers the backlight LEDs. >>>>> The backlight control works in two parts: >>>> >>>> _that powers the backlight LEDs_. >>>> >>>> So it is a power supply. >>>> >>>>> >>>>> 1. GPIO91 must be asserted to enable the WLED driver IC itself. >>>>> 2. The panel's CABC output (a PWM signal) is connected to the WLED driver's PWM input >>>>> and controls the actual brightness. >>>>> This CABC output is driven by the DCS set_display_brightness command sent from the panel driver. >>>>> >>>>> So the DCS commands control brightness via the panel's PWM/CABC output, >>>>> but the WLED driver IC needs to be enabled first via GPIO91. >>>>> >>>>> Since GPIO91 is on the Qualcomm daughter card and not on the panel connector. >>>>> >>>>> Dmitry suggested , it is not appropriate to model it in the panel binding. >>>>> The current approach of asserting it via pinctrl default state in the board DTS keeps it board-specific. >>>>> >>>>> If you have a better suggestion for modelling this, I'm happy to follow your guidance. >>>>> >>>>> SoC (ITP Baseband Card) >>>>> ├── GPIO91 (WLED_P1_EN) ─────────────────────────────────────┐ >>>>> │ │ >>>>> └── DSI ──────────────────────────────────────────────────┐ │ >>>>> │ │ >>>>> ┌──────────────────────────────────────────────────────────┼──┼──────────────────────────────────┐ >>>>> │ Qualcomm Display Daughter Card │ │ │ >>>>> │ │ │ │ >>>>> │ ┌─────────────────────────────────┐ │ │ ┌──────────────────────┐ │ >>>>> │ │ DLC DLC0697 Panel (ILI7807S) │◄────────────────────┘ │ │ WLED Driver IC │ │ >>>>> │ │ │ | │ │ │ >>>>> │ │ DCS set_display_brightness() │ └──►│ EN │ │ >>>>> │ │ │ │ │ │ │ >>>>> │ │ ▼ │ │ │ │ >>>>> │ │ CABC output ───────────────────┼───────────────────────────►│ PWM │ │ >>>>> │ │ │ │ │ │ >>>>> │ │ │ │ LED outputs ────────┼──► Backlight LEDs >>>>> │ └─────────────────────────────────┘ └──────────────────────┘ │ >>>>> │ │ >>>>> └────────────────────────────────────────────────────────────────────────────────────────────────┘ >>>> >>>> This is a nice diagram, but it shows backlight LEDs as something >>>> completely separate. Usually they are a part of the panel. Are they not >>>> in this case? >>>> >>>> I'd be more interested in a different representation of the information. >>>> What are the _actual_ panel inputs? Decribe those (and only those) in >>>> the panel bindings. >>>> >>> >>> No , Backlight LEDs are part of the panel, I will correct the diagram for that, >>> and regards panel bindings, I modeled only the actual panel inputs. >>> >>> Hopefully, this diagram will clear this. >>> >>> ┌─────────────────┐ ┌───────────────────────────────────────────────────────────────────────────────────────────┐ >>> │ SOC Card │ │ Display DC │ >>> │ │ │ ┌──────────────────────────────┐ │ >>> │ DSI0 │ │ │ DLC Display CONN │ │ >>> │ ├─ DSICLK_P/M ─┼─────────┼────────────────────────────────────────────────────────┼──► DSICLK_P/M │ │ >>> │ ├─ DSILN0_P/M ─┼─────────┼────────────────────────────────────────────────────────┼──► DSILN0_P/M │ │ >>> │ ├─ DSILN1_P/M ─┼─────────┼────────────────────────────────────────────────────────┼──► DSILN1_P/M │ │ >>> │ ├─ DSILN2_P/M ─┼─────────┼────────────────────────────────────────────────────────┼──► DSILN2_P/M │ │ >>> │ └─ DSILN3_P/M ─┼─────────┼────────────────────────────────────────────────────────┼──► DSILN3_P/M │ │ >>> │ │ │ │ │ │ >>> │ 1.8V ──────────┼─────────┼──────────────────────────────────── vddi ──────────────┼──► vddi │ │ >>> │ │ │ │ │ │ >>> │ VSYS_PWR ──────┼─────────┼──────┐ │ │ │ >>> │ │ │ │ │ │ │ >>> │ LCD_BIAS_EN ───┼─────────┼──────┼──► ┌──────────────────┐ │ │ │ >>> │ │ │ ├───►│ LCD BIAS DRIVER ├──── VREG_DISP_P (+5.5V)┼──► VREG_DISP_P (+5.5V) │ │ >>> │ │ │ │ └──────────────────┘──── VREG_DISP_N (-5.5V)─┼──► VREG_DISP_N (-5.5V) │ │ >>> │ │ │ │ │ │ │ >>> │ LCD_BKLT_EN ───┼─────────┼──────┼──► ┌──────────────────┐ │ │ │ >>> │ | | | │ WLED DRIVER ├──── VREG_WLED ──────────┼──► VREG_WLED │ │ >>> │ │ │ └───►│ ├──── WLED_SIN1 ─────────┼──► WLED_SIN1 │ │ >>> │ │ │ │ ├──── WLED_SIN2 ─────────┼──► WLED_SIN2 │ │ >>> │ │ │ │ ◄─PWM─┤◄───────────────────────┼◄── CABC │ │ >>> │ │ │ └──────────────────┘ │ │ │ >> >> Perfect. So this is LED device, it provides backlight to the panel. >> Describe it correctly in the DT. >> >> Think of somebody using PM8150's WLED with the panel. >> >> For the panel bindings use only actual panel inputs. Think of it being >> used on a completely different platform, without the DC card. >> > The panel driver already handles this generically. In ili7807s_probe(): > ret = drm_panel_of_backlight(&ctx->panel); > if (ret) > return ret; > > if (!ctx->panel.backlight) { > ctx->panel.backlight = ili7807s_create_backlight(dsi); > if (IS_ERR(ctx->panel.backlight)) > return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight), > "failed to create backlight\n"); > } > > If a platform provides a `backlight` phandle in the panel DT node > (e.g., PM8150 WLED or any other backlight device), drm_panel_of_backlight() > will use that external backlight device. > > The DCS fallback is not created in that case. > > For our Qualcomm display daughter card, the DCS fallback backlight is used. > > So the panel driver is already platform-agnostic: > > - On a platform with PM8150 WLED → provide backlight = <&pm8150_wled> > in the panel DT node, and the panel driver uses it directly. > > - On our daughter card → no backlight phandle, panel driver > creates DCS backlight, GPIO91 is handled via board-level pinctrl. > > Please let me know if there is another way to do this, > or if I have misunderstood your comment. > > Thanks, > Arpit > > >> >>> │ MDP_VSYNC_P ───┼─────────┼────────────────────────────────────────────────────────┼──► MDP_VSYNC_P │ │ >>> │ │ │ │ │ │ >>> │ DISP_RST ──────┼─────────┼────────────────────────────────────────────────────────┼──► DISP_RST │ │ >>> │ │ │ │ │ │ >>> │ Touch ─//──────┼─────────┼────────────────────────────────────────────────────────┼──► Touch signals │ │ >>> │ signals │ │ └──────────────────────────────┘ │ >>> └─────────────────┘ └───────────────────────────────────────────────────────────────────────────────────────────┘ >>> >>> Thanks, >>> Arpit >> >