From: kgunda@codeaurora.org To: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Lee Jones <lee.jones@linaro.org>, Daniel Thompson <daniel.thompson@linaro.org>, Jingoo Han <jingoohan1@gmail.com>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-leds@vger.kernel.org, linux-arm-msm-owner@vger.kernel.org Subject: Re: [PATCH V1 5/5] backlight: qcom-wled: Add auto string detection logic Date: Tue, 15 May 2018 10:20:45 +0530 [thread overview] Message-ID: <5477037fff5d6f6ef335221220b527b6@codeaurora.org> (raw) In-Reply-To: <20180514170237.GL14924@minitux> On 2018-05-14 22:32, Bjorn Andersson wrote: > On Wed 09 May 00:14 PDT 2018, kgunda@codeaurora.org wrote: > >> On 2018-05-07 23:40, Bjorn Andersson wrote: >> > On Thu 03 May 02:57 PDT 2018, Kiran Gunda wrote: >> > >> > [..] >> > > + >> > > +#define WLED_AUTO_DETECT_OVP_COUNT 5 >> > > +#define WLED_AUTO_DETECT_CNT_DLY_US HZ /* 1 second */ >> > > +static bool wled_auto_detection_required(struct wled *wled) >> > >> > So cfg.auto_detection_enabled is set, but we didn't have a fault during >> > wled_auto_detection_at_init(), which I presume indicates that the boot >> > loader configured the strings appropriately (or didn't enable the BL). >> > Then first time we try to enable the backlight we will hit the ovp irq, >> > which will enter here a few times to figure out that the strings are >> > incorrectly configured and then we will do the same thing that would >> > have been done if we probed with a fault. >> > >> > This is convoluted! >> > >> > If auto-detection is a feature allowing the developer to omit the string >> > configuration then just do the auto detection explicitly in probe when >> > the developer did so and then never do it again. >> > >> As explained in the previous patch, the auto-detection is needed >> later, >> because are also cases where one/more of the connected LED string of >> the >> display-backlight is malfunctioning (because of damage) and requires >> the >> damaged string to be turned off to prevent the complete panel and/or >> board >> from being damaged. > > Okay, that sounds very reasonable. Please ensure that it's clearly > described in the commit message, so that we have this documented if > someone wonders in the future. > > Regards, > Bjorn > -- Thanks for that ! Sure I will describe it in the commit message. > To unsubscribe from this list: send the line "unsubscribe > linux-arm-msm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: kgunda@codeaurora.org To: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Lee Jones <lee.jones@linaro.org>, Daniel Thompson <daniel.thompson@linaro.org>, Jingoo Han <jingoohan1@gmail.com>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-leds@vger.kernel.org, linux-arm-msm-owner@vger.kernel.org Subject: Re: [PATCH V1 5/5] backlight: qcom-wled: Add auto string detection logic Date: Tue, 15 May 2018 04:50:49 +0000 [thread overview] Message-ID: <5477037fff5d6f6ef335221220b527b6@codeaurora.org> (raw) In-Reply-To: <20180514170237.GL14924@minitux> On 2018-05-14 22:32, Bjorn Andersson wrote: > On Wed 09 May 00:14 PDT 2018, kgunda@codeaurora.org wrote: > >> On 2018-05-07 23:40, Bjorn Andersson wrote: >> > On Thu 03 May 02:57 PDT 2018, Kiran Gunda wrote: >> > >> > [..] >> > > + >> > > +#define WLED_AUTO_DETECT_OVP_COUNT 5 >> > > +#define WLED_AUTO_DETECT_CNT_DLY_US HZ /* 1 second */ >> > > +static bool wled_auto_detection_required(struct wled *wled) >> > >> > So cfg.auto_detection_enabled is set, but we didn't have a fault during >> > wled_auto_detection_at_init(), which I presume indicates that the boot >> > loader configured the strings appropriately (or didn't enable the BL). >> > Then first time we try to enable the backlight we will hit the ovp irq, >> > which will enter here a few times to figure out that the strings are >> > incorrectly configured and then we will do the same thing that would >> > have been done if we probed with a fault. >> > >> > This is convoluted! >> > >> > If auto-detection is a feature allowing the developer to omit the string >> > configuration then just do the auto detection explicitly in probe when >> > the developer did so and then never do it again. >> > >> As explained in the previous patch, the auto-detection is needed >> later, >> because are also cases where one/more of the connected LED string of >> the >> display-backlight is malfunctioning (because of damage) and requires >> the >> damaged string to be turned off to prevent the complete panel and/or >> board >> from being damaged. > > Okay, that sounds very reasonable. Please ensure that it's clearly > described in the commit message, so that we have this documented if > someone wonders in the future. > > Regards, > Bjorn > -- Thanks for that ! Sure I will describe it in the commit message. > To unsubscribe from this list: send the line "unsubscribe > linux-arm-msm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2018-05-15 4:50 UTC|newest] Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-05-03 9:57 [PATCH V1 0/5] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda 2018-05-03 9:57 ` [PATCH V1 1/5] qcom: wled: Rename pm8941-wled.c to qcom-wled.c Kiran Gunda 2018-05-03 9:58 ` Kiran Gunda 2018-05-07 15:41 ` Bjorn Andersson 2018-05-07 15:41 ` Bjorn Andersson 2018-05-10 11:10 ` Pavel Machek 2018-05-10 11:10 ` Pavel Machek 2018-05-03 9:57 ` [PATCH V1 2/5] backlight: qcom-wled: Add support for WLED4 peripheral Kiran Gunda 2018-05-03 9:59 ` Kiran Gunda 2018-05-07 16:20 ` Bjorn Andersson 2018-05-07 16:20 ` Bjorn Andersson 2018-05-08 10:25 ` kgunda 2018-05-08 10:37 ` kgunda 2018-05-08 17:17 ` Bjorn Andersson 2018-05-08 17:17 ` Bjorn Andersson 2018-05-09 5:15 ` kgunda 2018-05-09 5:27 ` kgunda 2018-05-17 9:47 ` kgunda 2018-05-17 9:59 ` kgunda 2018-05-17 12:31 ` Rob Herring 2018-05-17 12:31 ` Rob Herring 2018-05-17 12:31 ` Rob Herring 2018-05-17 15:10 ` kgunda 2018-05-17 15:22 ` kgunda 2018-05-18 12:20 ` Rob Herring 2018-05-18 12:20 ` Rob Herring 2018-05-18 12:20 ` Rob Herring 2018-05-14 16:57 ` Pavel Machek 2018-05-14 16:57 ` Pavel Machek 2018-05-15 4:55 ` kgunda 2018-05-15 4:56 ` kgunda 2018-05-03 9:57 ` [PATCH V1 3/5] backlight: qcom-wled: Add support for short circuit handling Kiran Gunda 2018-05-03 9:59 ` Kiran Gunda 2018-05-07 8:06 ` Dan Carpenter 2018-05-07 8:06 ` Dan Carpenter 2018-05-07 8:06 ` Dan Carpenter 2018-05-07 9:08 ` kgunda 2018-05-07 9:20 ` kgunda 2018-05-07 17:06 ` Bjorn Andersson 2018-05-07 17:06 ` Bjorn Andersson 2018-05-08 10:35 ` kgunda 2018-05-08 10:47 ` kgunda 2018-05-03 9:57 ` [PATCH V1 4/5] backlight: qcom-wled: Add support for OVP interrupt handling Kiran Gunda 2018-05-03 9:59 ` Kiran Gunda 2018-05-07 17:21 ` Bjorn Andersson 2018-05-07 17:21 ` Bjorn Andersson 2018-05-08 12:26 ` kgunda 2018-05-08 12:38 ` kgunda 2018-05-08 17:19 ` Bjorn Andersson 2018-05-08 17:19 ` Bjorn Andersson 2018-05-09 5:06 ` kgunda 2018-05-09 5:18 ` kgunda 2018-05-09 6:16 ` kgunda 2018-05-09 6:28 ` kgunda 2018-05-03 9:57 ` [PATCH V1 5/5] backlight: qcom-wled: Add auto string detection logic Kiran Gunda 2018-05-03 9:59 ` Kiran Gunda 2018-05-07 18:10 ` Bjorn Andersson 2018-05-07 18:10 ` Bjorn Andersson 2018-05-09 7:14 ` kgunda 2018-05-09 7:26 ` kgunda 2018-05-14 17:02 ` Bjorn Andersson 2018-05-14 17:02 ` Bjorn Andersson 2018-05-15 4:50 ` kgunda [this message] 2018-05-15 4:50 ` kgunda
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