From: Rex-BC Chen <rex-bc.chen@mediatek.com>
To: CK Hu <ck.hu@mediatek.com>,
"chunkuang.hu@kernel.org" <chunkuang.hu@kernel.org>,
"p.zabel@pengutronix.de" <p.zabel@pengutronix.de>,
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Cc: "msp@baylibre.com" <msp@baylibre.com>,
"granquet@baylibre.com" <granquet@baylibre.com>,
"Jitao Shi (石记涛)" <jitao.shi@mediatek.com>,
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Project_Global_Chrome_Upstream_Group
<Project_Global_Chrome_Upstream_Group@mediatek.com>
Subject: Re: [PATCH v14 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver
Date: Tue, 26 Jul 2022 14:42:58 +0800 [thread overview]
Message-ID: <9c5b85034ec77be80d771ce3a17260453f007728.camel@mediatek.com> (raw)
In-Reply-To: <378f904a445e90d65048ed07a1a55fd8c633f934.camel@mediatek.com>
On Mon, 2022-07-25 at 17:16 +0800, CK Hu wrote:
> Hi, Bo-Chen:
>
> On Tue, 2022-07-12 at 19:12 +0800, Bo-Chen Chen wrote:
> > From: Markus Schneider-Pargmann <msp@baylibre.com>
> >
> > This patch adds a embedded displayport driver for the MediaTek
> > mt8195
> > SoC.
> >
> > It supports the MT8195, the embedded DisplayPort units. It offers
> > DisplayPort 1.4 with up to 4 lanes.
> >
> > The driver creates a child device for the phy. The child device
> > will
> > never exist without the parent being active. As they are sharing a
> > register range, the parent passes a regmap pointer to the child so
> > that
> > both can work with the same register range. The phy driver sets
> > device
> > data that is read by the parent to get the phy device that can be
> > used
> > to control the phy properties.
> >
> > This driver is based on an initial version by
> > Jitao shi <jitao.shi@mediatek.com>
> >
> > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> > ---
>
> [snip]
>
> > +
> > +static int mtk_dp_training(struct mtk_dp *mtk_dp)
> > +{
> > + short max_retry = 50;
> > + int ret;
> > +
> > + do {
> > + ret = mtk_dp_train_start(mtk_dp);
> > + if (!ret)
> > + break;
> > + else if (ret != -EAGAIN)
> > + return ret;
> > + } while (--max_retry);
>
> mtk_dp_train_start() would never return -EAGAIN, so drop this while
> loop.
>
> Regards,
> CK
>
Hello CK,
the function will not return -EAGAIN, but we still want to retry 50
times if mtk_dp_train_start() is failed. If we retry 50 times and it is
still failed. We can confirm there are some issues for the device.
I will remove the else if of -EAGAIN and keep th while loop.
BRs,
Bo-Chen
> >
> > + if (!max_retry)
> > + return -ETIMEDOUT;
> > +
> > + ret = mtk_dp_video_config(mtk_dp);
> > + if (ret)
> > + return ret;
> > + mtk_dp_video_enable(mtk_dp, true);
> > +
> > + return 0;
> > +}
> > +
>
>
next prev parent reply other threads:[~2022-07-26 6:43 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-12 11:12 [PATCH v14 00/10] drm/mediatek: Add MT8195 DisplayPort driver Bo-Chen Chen
2022-07-12 11:12 ` [PATCH v14 01/10] dt-bindings: mediatek,dp: Add Display Port binding Bo-Chen Chen
2022-07-13 7:56 ` CK Hu
2022-07-26 6:18 ` Rex-BC Chen
2022-07-26 8:46 ` CK Hu
2022-07-18 20:21 ` Rob Herring
2022-07-12 11:12 ` [PATCH v14 02/10] drm/edid: Convert cea_sad helper struct to kernelDoc Bo-Chen Chen
2022-07-12 11:12 ` [PATCH v14 03/10] drm/edid: Add cea_sad helpers for freq/length Bo-Chen Chen
2022-07-14 11:12 ` AngeloGioacchino Del Regno
2022-07-14 11:19 ` Rex-BC Chen
2022-07-12 11:12 ` [PATCH v14 04/10] video/hdmi: Add audio_infoframe packing for DP Bo-Chen Chen
2022-07-14 11:26 ` AngeloGioacchino Del Regno
2022-07-12 11:12 ` [PATCH v14 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver Bo-Chen Chen
2022-07-13 8:03 ` CK Hu
2022-07-13 8:10 ` CK Hu
2022-07-14 8:24 ` Rex-BC Chen
2022-07-14 10:21 ` CK Hu
2022-07-13 8:22 ` CK Hu
2022-07-13 8:30 ` CK Hu
2022-07-13 9:12 ` CK Hu
2022-07-13 9:31 ` CK Hu
2022-07-14 8:52 ` Rex-BC Chen
2022-07-13 9:33 ` CK Hu
2022-07-14 8:57 ` Rex-BC Chen
2022-07-13 9:45 ` CK Hu
2022-07-14 6:51 ` CK Hu
2022-07-14 9:09 ` Rex-BC Chen
2022-07-14 10:34 ` CK Hu
2022-07-14 7:06 ` CK Hu
2022-07-15 8:51 ` CK Hu
2022-07-21 2:38 ` Rex-BC Chen
2022-07-21 6:24 ` CK Hu
2022-07-15 9:13 ` CK Hu
2022-07-15 9:14 ` CK Hu
2022-07-15 9:37 ` CK Hu
2022-07-15 18:01 ` kernel test robot
2022-07-25 9:16 ` CK Hu
2022-07-26 6:42 ` Rex-BC Chen [this message]
2022-07-26 9:34 ` CK Hu
2022-07-26 10:06 ` Rex-BC Chen
2022-07-25 9:23 ` CK Hu
2022-07-26 3:30 ` Rex-BC Chen
2022-07-26 8:37 ` CK Hu
2022-07-12 11:12 ` [PATCH v14 06/10] drm/mediatek: Add MT8195 External DisplayPort support Bo-Chen Chen
2022-07-25 9:51 ` CK Hu
2022-07-12 11:12 ` [PATCH v14 07/10] drm/mediatek: add hpd debounce Bo-Chen Chen
2022-07-12 11:12 ` [PATCH v14 08/10] drm/mediatek: set monitor to DP_SET_POWER_D3 to avoid garbage Bo-Chen Chen
2022-07-12 11:12 ` [PATCH v14 09/10] drm/mediatek: DP audio support for MT8195 Bo-Chen Chen
2022-07-14 11:43 ` AngeloGioacchino Del Regno
2022-07-12 11:12 ` [PATCH v14 10/10] drm/mediatek: Use cached audio config when changing resolution Bo-Chen Chen
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