From: Archit Taneja <architt@codeaurora.org>
To: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, Pawel Moll <pawel.moll@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
dri-devel@lists.freedesktop.org, Rob Herring <robh+dt@kernel.org>,
Chris Healy <Chris.Healy@zii.aero>,
Kumar Gala <galak@codeaurora.org>,
Thierry Reding <treding@nvidia.com>
Subject: Re: [PATCH 2/2] drm/bridge: tc358767: Add DPI to eDP bridge driver
Date: Mon, 11 Jul 2016 14:16:44 +0530 [thread overview]
Message-ID: <57835CF4.2080601@codeaurora.org> (raw)
In-Reply-To: <1468226655.3048.2.camel@pengutronix.de>
On 07/11/2016 02:14 PM, Philipp Zabel wrote:
> Am Montag, den 11.07.2016, 14:02 +0530 schrieb Archit Taneja:
> [...]
>>>>> + /* PXL PLL setup */
>>>>> + if (tc->test_pattern) {
>>>>
>>>> I couldn't find out who is setting tc->test_pattern. Is it always
>>>> 0?
>>>
>>> Hm, you are right. I wonder what a good mechanism would be to enable a
>>> test pattern for a bridge driver. Module parameters? We don't have
>>> anyhting like V4L2_CID_TEST_PATTERN in drm. I could also drop test
>>> pattern support from the initial patch and submit it separately.
>>
>> Module parameter sounds like a good option.
>
> Ok.
>
>> Although, it seems like the pll is enabled only when test_pattern is
>> set. How does the bridge work if the pll isn't enabled?
>
> The PXL PLL is only necessary regenerate the pixel clock from the DSI HS
> clock, or to create the test pattern. In DPI mode the pixel clock from
> the parallel interface is used directly.
Okay. Thanks for the clarification.
Archit
>
> regards
> Philipp
>
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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prev parent reply other threads:[~2016-07-11 8:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-01 14:50 [PATCH 0/2] Toshiba TC358767 eDP bridge driver Philipp Zabel
[not found] ` <1467384610-29908-1-git-send-email-p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2016-07-01 14:50 ` [PATCH 1/2] dt-bindings: tc358767: add DT documentation Philipp Zabel
2016-07-05 3:23 ` Archit Taneja
2016-07-05 7:59 ` Philipp Zabel
2016-07-01 14:50 ` [PATCH 2/2] drm/bridge: tc358767: Add DPI to eDP bridge driver Philipp Zabel
2016-07-05 4:38 ` Archit Taneja
2016-07-05 8:00 ` Philipp Zabel
2016-07-11 8:32 ` Archit Taneja
2016-07-11 8:44 ` Philipp Zabel
2016-07-11 8:46 ` Archit Taneja [this message]
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