Messages in this thread | | | Subject | Re: [PATCH v12 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver | From | CK Hu <> | Date | Tue, 28 Jun 2022 14:42:26 +0800 |
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Hi, Bo-Chen:
On Mon, 2022-06-27 at 16:03 +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> > [Bo-Chen: Cleanup the drivers and modify comments from reviewers] > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com> > ---
[snip]
> + > +static int mtk_dp_training(struct mtk_dp *mtk_dp) > +{ > + bool training_done = false; > + short max_retry = 50; > + int ret = 0; > + > + do { > + switch (mtk_dp->train_state) { > + case MTK_DP_TRAIN_STATE_TRAINING: > + ret = mtk_dp_train_start(mtk_dp); > + if (!ret) > + mtk_dp->train_state = > MTK_DP_TRAIN_STATE_NORMAL; > + break; > + case MTK_DP_TRAIN_STATE_NORMAL: > + mtk_dp_video_config(mtk_dp); > + mtk_dp_video_enable(mtk_dp, true); > + training_done = true; > + break; > + default: > + break; > + } > + > + if (ret) { > + if (ret == -EAGAIN) > + continue; > + /* > + * If we get any other error number, it doesn't > + * make any sense to keep iterating. > + */ > + break; > + } > + } while (!training_done || --max_retry); > + > + return ret; > +}
This function could re rewritten as:
static bool mtk_dp_training(struct mtk_dp *mtk_dp) { short max_retry = 50;
do { ret = mtk_dp_train_start(mtk_dp); if (!ret) break; else if (ret != -EAGAIN) return false; } while (--max_retry);
if (!max_retry) return false;
mtk_dp_video_config(mtk_dp); mtk_dp_video_enable(mtk_dp, true);
return true; }
Regards, CK
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