Re: [v2 1/5] drm/mediatek: move mipi_dsi_host_register to probe

[Jitao Shi <jitao.shi@mediatek.com>]

On Tue, 2019-05-07 at 17:52 +0800, CK Hu wrote:
> Hi, Jitao:
> 
> On Tue, 2019-04-16 at 14:04 +0800, Jitao Shi wrote:
> > DSI panel driver need attach function which is inculde in
> > mipi_dsi_host_ops.
> > 
> > If mipi_dsi_host_register is not in probe, dsi panel will
> > probe fail or more delay.
> 
> I think this patch just prevent delay, not to prevent dsi panel probe
> fail. In [1], you mention mipi_dsi_attach() is called in
> panel_simple_dsi_probe(), but panel_simple_dsi_probe() is trigger by
> mipi_dsi_host_register(), so the probe would success.
> 
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/panel/panel-simple.c?h=v5.0-rc6#n2987
> 
> 

Yes, this just prevent delay.

> > 
> > So move the mipi_dsi_host_register to probe from bind.
> > 
> > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dsi.c | 50 ++++++++++++++++++------------
> >  1 file changed, 30 insertions(+), 20 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index b00eb2d2e086..6c4ac37f983d 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -1045,12 +1045,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> >  		return ret;
> >  	}
> >  
> > -	ret = mipi_dsi_host_register(&dsi->host);
> > -	if (ret < 0) {
> > -		dev_err(dev, "failed to register DSI host: %d\n", ret);
> > -		goto err_ddp_comp_unregister;
> > -	}
> > -
> >  	ret = mtk_dsi_create_conn_enc(drm, dsi);
> >  	if (ret) {
> >  		DRM_ERROR("Encoder create failed with %d\n", ret);
> > @@ -1060,8 +1054,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> >  	return 0;
> >  
> >  err_unregister:
> > -	mipi_dsi_host_unregister(&dsi->host);
> > -err_ddp_comp_unregister:
> >  	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
> >  	return ret;
> >  }
> > @@ -1097,31 +1089,37 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> >  
> >  	dsi->host.ops = &mtk_dsi_ops;
> >  	dsi->host.dev = dev;
> > +	dsi->dev = dev;
> 
> Why do this?
> 
> Regards,
> CK
> 

There are some error message require this poweron().

> > +	ret = mipi_dsi_host_register(&dsi->host);
> > +	if (ret < 0) {
> > +		dev_err(dev, "failed to register DSI host: %d\n", ret);
> > +		return ret;
> > +	}
> >  
> >  	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> >  					  &dsi->panel, &dsi->bridge);
> >  	if (ret)
> > -		return ret;
> > +		goto err_unregister_host;
> >  
> >  	dsi->engine_clk = devm_clk_get(dev, "engine");
> >  	if (IS_ERR(dsi->engine_clk)) {
> >  		ret = PTR_ERR(dsi->engine_clk);
> >  		dev_err(dev, "Failed to get engine clock: %d\n", ret);
> > -		return ret;
> > +		goto err_unregister_host;
> >  	}
> >  
> >  	dsi->digital_clk = devm_clk_get(dev, "digital");
> >  	if (IS_ERR(dsi->digital_clk)) {
> >  		ret = PTR_ERR(dsi->digital_clk);
> >  		dev_err(dev, "Failed to get digital clock: %d\n", ret);
> > -		return ret;
> > +		goto err_unregister_host;
> >  	}
> >  
> >  	dsi->hs_clk = devm_clk_get(dev, "hs");
> >  	if (IS_ERR(dsi->hs_clk)) {
> >  		ret = PTR_ERR(dsi->hs_clk);
> >  		dev_err(dev, "Failed to get hs clock: %d\n", ret);
> > -		return ret;
> > +		goto err_unregister_host;
> >  	}
> >  
> >  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> 
> 
> 


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