Re: [v9,2/3] drm/mediatek: implement the DSI hs packets aligned

[Andrzej Hajda]

On 14.01.2022 11:20, Rex-BC Chen wrote:
> Hello AngeloGioacchino,
>
> Thanks for your review.
> I will modify this in next version.
>
> BRs,
> Rex-BC Chen
>
> On Fri, 2022-01-14 at 10:36 +0100, AngeloGioacchino Del Regno wrote:
> > Il 14/01/22 10:21, Rex-BC Chen ha scritto:
> > > Some DSI RX devices require the packets on all lanes aligned at the
> > > end.
> > > Otherwise, there will be some issues of shift or scroll for screen.
> > >
> > > Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
> > > Signed-off-by: Rex-BC Chen <rex-bc.chen@xxxxxxxxxxxx>
> > Hello,
> > thanks for the patch! However, there's something to improve...
> >
> > > ---
> > >    drivers/gpu/drm/mediatek/mtk_dsi.c | 12 ++++++++++++
> > >    1 file changed, 12 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > index 5d90d2eb0019..ccdda15f5a66 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > @@ -195,6 +195,8 @@ struct mtk_dsi {
> > >    	struct clk *hs_clk;
> > >    
> > >    	u32 data_rate;
> > > +	/* force dsi line end without dsi_null data */
> > > +	bool hs_packet_end_aligned;
> > There's no need to introduce a new variable here...
> > >    
> > >    	unsigned long mode_flags;
> > >    	enum mipi_dsi_pixel_format format;
> > > @@ -500,6 +502,13 @@ static void mtk_dsi_config_vdo_timing(struct
> > > mtk_dsi *dsi)
> > >    		DRM_WARN("HFP + HBP less than d-phy, FPS will under
> > > 60Hz\n");
> > >    	}
> > >    
> > > +	if (dsi->hs_packet_end_aligned) {
> > You can simply check mode_flags here:
> > 	if (dsi->mode_flags & MIPI_DSI_HS_PKT_END_ALIGNED) {
> >
> > > +		horizontal_sync_active_byte =
> > > roundup(horizontal_sync_active_byte, dsi->lanes) - 2;
> > > +		horizontal_frontporch_byte =
> > > roundup(horizontal_frontporch_byte, dsi->lanes) - 2;
> > > +		horizontal_backporch_byte =
> > > roundup(horizontal_backporch_byte, dsi->lanes) - 2;
> > > +		horizontal_backporch_byte -= (vm->hactive *
> > > dsi_tmp_buf_bpp + 2) % dsi->lanes;
> > > +	}
> > > +


And if you could add comment explaining the magic here it would be nice.


Regards

Andrzej


> > >    	writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
> > >    	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
> > >    	writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
> > > @@ -794,6 +803,9 @@ static int mtk_dsi_host_attach(struct
> > > mipi_dsi_host *host,
> > >    	dsi->lanes = device->lanes;
> > >    	dsi->format = device->format;
> > >    	dsi->mode_flags = device->mode_flags;
> > > +	dsi->hs_packet_end_aligned = (dsi->mode_flags &
> > > +				      MIPI_DSI_HS_PKT_END_ALIGNED)
> > > +				     ? true : false;
> > ...so there's no need for this one, either.
> >
> > >    
> > >    	return 0;
> > >    }
> > Regards,
> > - Angelo