drm/mediatek: implement the DSI hs packets aligned

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

Posted by Rex-BC Chen 4 years ago

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@mediatek.com>
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
---
 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;
 
 	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) {
+		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;
+	}
+
 	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;
 
 	return 0;
 }
-- 
2.18.0

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

Posted by AngeloGioacchino Del Regno 4 years ago

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@mediatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>

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;
> +	}
> +
>   	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

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

Posted by Rex-BC Chen 4 years ago

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@mediatek.com>
> > Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
> 
> 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;
> > +	}
> > +
> >   	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
>

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

Posted by Andrzej Hajda 4 years ago

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@mediatek.com>
>>> Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
>> 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
>>

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

Posted by Rex-BC Chen 4 years ago

Hello Andrzej,

Thanks for your review.
I will give the explanation for this in next version.

BRs,
Rex-BC hen

On Fri, 2022-01-14 at 12:11 +0100, Andrzej Hajda wrote:
> 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@mediatek.com>
> > > > Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
> > > 
> > > 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_ALIGN
> > > > ED)
> > > > +				     ? true : false;
> > > 
> > > ...so there's no need for this one, either.
> > > 
> > > >    
> > > >    	return 0;
> > > >    }
> > > > 
> > > 
> > > Regards,
> > > - Angelo
> > >