On 14/10/24 3:19 pm, Manikandan Muralidharan wrote: > From: Cyrille Pitchen <[email protected]> > > On SoCs, like the SAM9X75, which embed the XLCDC ip, the registers that > configure the unified scaling engine were not filled with proper values. > > Indeed, for YCbCr formats, the VXSCFACT bitfield of the HEOCFG25 > register and the HXSCFACT bitfield of the HEOCFG27 register were > incorrect. > > For 4:2:0 formats, both vertical and horizontal factors for > chroma chanels should be divided by 2 from the factors for the luma > channel. Hence: > > HEOCFG24.VXSYFACT = VFACTOR > HEOCFG25.VSXCFACT = VFACTOR / 2 > HEOCFG26.HXSYFACT = HFACTOR > HEOCFG27.HXSCFACT = HFACTOR / 2 > > However, for 4:2:2 formats, only the horizontal factor for chroma > chanels should be divided by 2 from the factor for the luma channel; > the vertical factor is the same for all the luma and chroma channels. > Hence: > > HEOCFG24.VXSYFACT = VFACTOR > HEOCFG25.VXSCFACT = VFACTOR > HEOCFG26.HXSYFACT = HFACTOR > HEOCFG27.HXSCFACT = HFACTOR / 2 > > Fixes: d498771b0b83 ("drm: atmel_hlcdc: Add support for XLCDC using IP > specific driver ops") > Signed-off-by: Cyrille Pitchen <[email protected]>
Applied to drm-misc-next. drm: atmel-hlcdc: fix atmel_xlcdc_plane_setup_scaler() https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/a312acdc > --- > .../gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 27 ++++++++++++++++--- > 1 file changed, 24 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c > b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c > index 4bcaf2cd7672..41c7351ae811 100644 > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c > @@ -365,13 +365,34 @@ void atmel_xlcdc_plane_setup_scaler(struct > atmel_hlcdc_plane *plane, > xfactor); > > /* > - * With YCbCr 4:2:2 and YCbYcr 4:2:0 window resampling, configuration > - * register LCDC_HEOCFG25.VXSCFACT and LCDC_HEOCFG27.HXSCFACT is half > + * With YCbCr 4:2:0 window resampling, configuration register > + * LCDC_HEOCFG25.VXSCFACT and LCDC_HEOCFG27.HXSCFACT values are half > * the value of yfactor and xfactor. > + * > + * On the other hand, with YCbCr 4:2:2 window resampling, only the > + * configuration register LCDC_HEOCFG27.HXSCFACT value is half the value > + * of the xfactor; the value of LCDC_HEOCFG25.VXSCFACT is yfactor (no > + * division by 2). > */ > - if (state->base.fb->format->format == DRM_FORMAT_YUV420) { > + switch (state->base.fb->format->format) { > + /* YCbCr 4:2:2 */ > + case DRM_FORMAT_YUYV: > + case DRM_FORMAT_UYVY: > + case DRM_FORMAT_YVYU: > + case DRM_FORMAT_VYUY: > + case DRM_FORMAT_YUV422: > + case DRM_FORMAT_NV61: > + xfactor /= 2; > + break; > + > + /* YCbCr 4:2:0 */ > + case DRM_FORMAT_YUV420: > + case DRM_FORMAT_NV21: > yfactor /= 2; > xfactor /= 2; > + break; > + default: > + break; > } > > atmel_hlcdc_layer_write_cfg(&plane->layer, desc->layout.scaler_config + > 2, -- Thanks and Regards, Manikandan M.
