Konrad Rzeszutek Wilk wrote:
>> > #define FBINFO_PARTIAL_PAN_OK 0x0040 /* otw use pan only for double-buffering */
>> > #define FBINFO_READS_FAST 0x0080 /* soft-copy faster than rendering */
> Not really. They have a different function, but you are better of looking in the code
> to see how they are used.
Well, I tried that, which is why I said, "I don't see any good documentation." FBINFO_PARTIAL_PAN_OK appears to be only used in one place:
case SCROLL_PAN_REDRAW:
if ((p->yscroll + count <=
2 * (p->vrows - vc->vc_rows))
&& ((!scroll_partial && (b - t == vc->vc_rows))
|| (scroll_partial
&& (b - t - count >
3 * vc->vc_rows >> 2)))) {
if (t > 0)
fbcon_redraw_move(vc, p, 0, t, count);
ypan_up_redraw(vc, t, count);
if (vc->vc_rows - b > 0)
fbcon_redraw_move(vc, p, b,
vc->vc_rows - b, b);
} else
fbcon_redraw_move(vc, p, t + count, b - t - count, t);
fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
break;
I can't parse this, and I can't figure out if my driver is better off with or without FBINFO_PARTIAL_PAN_OK.
I have the same problem with FBINFO_READS_FAST.
So I really would like someone explain these macros to me.
--
Timur Tabi
Linux kernel developer at Freescale
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