[PATCH v11 8/9] drm/msm/dsi: Use MSM and DRM DSC helper methods

[Marijn Suijten]

On 2023-05-17 21:13:36, Marijn Suijten wrote:
> 
> On 2023-05-17 11:51:17, Jessica Zhang wrote:
> > 
> > Use MSM and DRM DSC helper methods to configure DSC for DSI.
> > 
> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> > Reviewed-by: Marijn Suijten <marijn.suijten at somainline.org>
> > Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
> > ---
> >  drivers/gpu/drm/msm/dsi/dsi_host.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> > index 74d38f90398a..b21108948061 100644
> > --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> > +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> > @@ -28,6 +28,7 @@
> >  #include "dsi.xml.h"
> >  #include "sfpb.xml.h"
> >  #include "dsi_cfg.h"
> > +#include "msm_dsc_helper.h"
> >  #include "msm_kms.h"
> >  #include "msm_gem.h"
> >  #include "phy/dsi_phy.h"
> > @@ -848,7 +849,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
> >  	/* first calculate dsc parameters and then program
> >  	 * compress mode registers
> >  	 */
> > -	slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->slice_width);
> > +	slice_per_intf = msm_dsc_get_slices_per_intf(dsc, hdisplay);
> >  
> >  	/*
> >  	 * If slice_count is greater than slice_per_intf
> > @@ -858,7 +859,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
> >  	if (dsc->slice_count > slice_per_intf)
> >  		dsc->slice_count = 1;
> >  
> > -	total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf;
> > +	total_bytes_per_intf = dsc->slice_count * slice_per_intf;
> 
> Oh no, this line shouldn't have changed.  Besides not conforming to the
> "use MSM and DRM DSC helper methods" title, this is now no longer
> computing the bytes that we were in v10.  Was this tested?

Regarding testing, it probably goes unnoticed easily because of only
being used in eol_byte_num = total_bytes_per_intf % 3: on hdisplay=1096
and slice_count=slice_per_intf=2 both result in eol_byte_num=1 :)

- Marijn

> 
> - Marijn
> 
> >  
> >  	eol_byte_num = total_bytes_per_intf % 3;
> >  	pkt_per_line = slice_per_intf / dsc->slice_count;
> > @@ -1759,7 +1760,7 @@ static int dsi_populate_dsc_params(struct msm_dsi_host *msm_host, struct drm_dsc
> >  		return ret;
> >  	}
> >  
> > -	dsc->initial_scale_value = 32;
> > +	dsc->initial_scale_value = drm_dsc_initial_scale_value(dsc);
> >  	dsc->line_buf_depth = dsc->bits_per_component + 1;
> >  
> >  	return drm_dsc_compute_rc_parameters(dsc);
> > 
> > -- 
> > 2.40.1
> >