On Tue, Jun 26, 2012 at 03:30:09AM +0200, Laurent Pinchart wrote:
> Hi Sakari,
Hi Laurent,
> On Saturday 23 June 2012 11:22:37 Sakari Ailus wrote:
> > On Mon, Jun 18, 2012 at 04:30:53PM +0200, Laurent Pinchart wrote:
> > > Rearrange the CFA interpolation coefficients table based on the Bayer
> > > pattern. Modifying the table during streaming isn't supported anymore,
> > > but didn't make sense in the first place anyway.
> >
> > Why not? I could imagine someone might want to change the table while
> > streaming to change the white balance, for example. Gamma tables or the SRGB
> > matrix can be used to do mostly the same but we should leave the decision
> > which one to use to the user space.
>
> Because making the CFA table runtime-configurable brings an additional
> complexity without a use case I'm aware of. The preview engine has separate
> gamma tables, white balance matrices, and RGB-to-RGB and RGB-to-YUV matrices
> that can be modified during streaming. If a user really needs to modify the
> CFA tables during streaming I'll be happy to implement that (and even happier
> to receive a patch :-)), but I'm a bit reluctant to add complexity to an
> already complex code without a real use case.
I'm fine with that. Let's get back to the topic once this is really needed.
...
> > > + return;
> > > + }
> > > +
> > > + params = (prev->params.active & OMAP3ISP_PREV_CFA)
> > > + ? &prev->params.params[0] : &prev->params.params[1];
> > > +
> > > + isp_reg_set(isp, OMAP3_ISP_IOMEM_PREV, ISPPRV_PCR, ISPPRV_PCR_CFAEN);
> > > + isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_PREV, ISPPRV_PCR,
> > > + ISPPRV_PCR_CFAFMT_MASK, ISPPRV_PCR_CFAFMT_BAYER);
> > > +
> > > + isp_reg_writel(isp,
> > > + (params->cfa.gradthrs_vert << ISPPRV_CFA_GRADTH_VER_SHIFT) |
> > > + (params->cfa.gradthrs_horz << ISPPRV_CFA_GRADTH_HOR_SHIFT),
> > > + OMAP3_ISP_IOMEM_PREV, ISPPRV_CFA);
> > > +
> > > + switch (prev->formats[PREV_PAD_SINK].code) {
> > > + case V4L2_MBUS_FMT_SGRBG10_1X10:
> >
> > > + default:
> > Is the "default" case expected to ever happen?
How about this one?
> > > + order = cfa_coef_order[0];
> > > + break;
> > > + case V4L2_MBUS_FMT_SRGGB10_1X10:
> > > + order = cfa_coef_order[1];
> > > + break;
> > > + case V4L2_MBUS_FMT_SBGGR10_1X10:
> > > + order = cfa_coef_order[2];
> > > + break;
> > > + case V4L2_MBUS_FMT_SGBRG10_1X10:
> > > + order = cfa_coef_order[3];
> > > + break;
> > > + }
> > > +
> > > + isp_reg_writel(isp, ISPPRV_CFA_TABLE_ADDR,
> > > + OMAP3_ISP_IOMEM_PREV, ISPPRV_SET_TBL_ADDR);
> > > +
> > > + for (i = 0; i < 4; ++i) {
> > > + __u32 *block = params->cfa.table
> > > + + order[i] * OMAP3ISP_PREV_CFA_BLK_SIZE;
> > > +
> > > + for (j = 0; j < OMAP3ISP_PREV_CFA_BLK_SIZE; ++j)
> > > + isp_reg_writel(isp, block[j], OMAP3_ISP_IOMEM_PREV,
> > > + ISPPRV_SET_TBL_DATA);
> > > + }
> > >
> > > }
> > >
> > > /*
Regards,
--
Sakari Ailus
e-mail: sakari.ailus@xxxxxx jabber/XMPP/Gmail: sailus@xxxxxxxxxxxxxx
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