On 2017-06-20 21:25, Peter Rosin wrote:
> The redundant fb helpers .load_lut, .gamma_set and .gamma_get are
> no longer used. Remove the dead code and hook up the crtc .gamma_set
> to use the crtc gamma_store directly instead of duplicating that
> info locally.
[...]
> - for (i = 0; i < 256; i++) {
> - u16 r = nv_crtc->lut.r[i] >> 2;
> - u16 g = nv_crtc->lut.g[i] >> 2;
> - u16 b = nv_crtc->lut.b[i] >> 2;
> + r = crtc->gamma_store;
> + g = r + crtc->gamma_size;
> + b = g + crtc->gamma_size;
>
> + for (i = 0; i < 256; i++) {
> if (disp->disp->oclass < GF110_DISP) {
> - writew(r + 0x0000, lut + (i * 0x08) + 0);
> - writew(g + 0x0000, lut + (i * 0x08) + 2);
> - writew(b + 0x0000, lut + (i * 0x08) + 4);
> + writew((*r++ >> 2) + 0x0000, lut + (i * 0x08) + 0);
> + writew((*g++ >> 2) + 0x0000, lut + (i * 0x08) + 2);
> + writew((*b++ >> 2) + 0x0000, lut + (i * 0x08) + 4);
> } else {
> - writew(r + 0x6000, lut + (i * 0x20) + 0);
> - writew(g + 0x6000, lut + (i * 0x20) + 2);
> - writew(b + 0x6000, lut + (i * 0x20) + 4);
> + writew((*r++ >> 2) + 0x6000, lut + (i * 0x20) + 0);
> + writew((*g++ >> 2) + 0x6000, lut + (i * 0x20) + 2);
> + writew((*b++ >> 2) + 0x6000, lut + (i * 0x20) + 4);
> }
> }
> }
I forgot to mention this, but the above is very strange for
disp->disp->oclass >= GF110_DISP because 0x6000 interferes with
the 14 bits that appear to be the lut depth in the registers.
I suspect some other bit-shift should be used for that case?
Someone should probably consult a datasheet...
Cheers,
peda
