| Message ID | 20230419070712.1422335-4-alexander.stein@ew.tq-group.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Fix imx7-media-csi format settings | expand |
Hi Alexander, Thank you for the patch. On Wed, Apr 19, 2023 at 09:07:11AM +0200, Alexander Stein wrote: > The driver unconditionally aligns the image width to multiples of 8 > pixels. The real alignment constraint is 8 bytes, as indicated by the > CSI_IMAG_PARA.IMAGE_WIDTH documentation that calls for 8 pixel alignment > for 8bpp formats and 4 pixel alignment for other formats. > > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > Changes in v4: > * Improve commit message > * Simplify walign calculation > * Remove comment on hardware alignment constraints > > drivers/media/platform/nxp/imx7-media-csi.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/drivers/media/platform/nxp/imx7-media-csi.c b/drivers/media/platform/nxp/imx7-media-csi.c > index 1315f5743b76f..e6abbfbc5c129 100644 > --- a/drivers/media/platform/nxp/imx7-media-csi.c > +++ b/drivers/media/platform/nxp/imx7-media-csi.c > @@ -1146,6 +1146,7 @@ __imx7_csi_video_try_fmt(struct v4l2_pix_format *pixfmt, > struct v4l2_rect *compose) > { > const struct imx7_csi_pixfmt *cc; > + u32 walign; > > if (compose) { > compose->width = pixfmt->width; > @@ -1163,12 +1164,13 @@ __imx7_csi_video_try_fmt(struct v4l2_pix_format *pixfmt, > } > > /* > - * Round up width for minimum burst size. > + * The width alignment is 8 bytes as indicated by the > + * CSI_IMAG_PARA.IMAGE_WIDTH documentation. Convert it to pixels. > * > - * TODO: Implement configurable stride support, and check what the real > - * hardware alignment constraint on the width is. > + * TODO: Implement configurable stride support. > */ > - v4l_bound_align_image(&pixfmt->width, 1, 0xffff, 8, > + walign = 8 * 8 / cc->bpp; > + v4l_bound_align_image(&pixfmt->width, 1, 0xffff, walign, > &pixfmt->height, 1, 0xffff, 1, 0); > > pixfmt->bytesperline = pixfmt->width * cc->bpp / 8;
diff --git a/drivers/media/platform/nxp/imx7-media-csi.c b/drivers/media/platform/nxp/imx7-media-csi.c index 1315f5743b76f..e6abbfbc5c129 100644 --- a/drivers/media/platform/nxp/imx7-media-csi.c +++ b/drivers/media/platform/nxp/imx7-media-csi.c @@ -1146,6 +1146,7 @@ __imx7_csi_video_try_fmt(struct v4l2_pix_format *pixfmt, struct v4l2_rect *compose) { const struct imx7_csi_pixfmt *cc; + u32 walign; if (compose) { compose->width = pixfmt->width; @@ -1163,12 +1164,13 @@ __imx7_csi_video_try_fmt(struct v4l2_pix_format *pixfmt, } /* - * Round up width for minimum burst size. + * The width alignment is 8 bytes as indicated by the + * CSI_IMAG_PARA.IMAGE_WIDTH documentation. Convert it to pixels. * - * TODO: Implement configurable stride support, and check what the real - * hardware alignment constraint on the width is. + * TODO: Implement configurable stride support. */ - v4l_bound_align_image(&pixfmt->width, 1, 0xffff, 8, + walign = 8 * 8 / cc->bpp; + v4l_bound_align_image(&pixfmt->width, 1, 0xffff, walign, &pixfmt->height, 1, 0xffff, 1, 0); pixfmt->bytesperline = pixfmt->width * cc->bpp / 8;
The driver unconditionally aligns the image width to multiples of 8 pixels. The real alignment constraint is 8 bytes, as indicated by the CSI_IMAG_PARA.IMAGE_WIDTH documentation that calls for 8 pixel alignment for 8bpp formats and 4 pixel alignment for other formats. Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> --- Changes in v4: * Improve commit message * Simplify walign calculation * Remove comment on hardware alignment constraints drivers/media/platform/nxp/imx7-media-csi.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)