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winsys/radeon: better explain the num_tile_pipes fixup for TAHITI (v2)

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v2: Clarify the relation between num_tiles_pipes and GB_TILE_MODE and the fix
 needed for Tahiti as suggested by Marek.

Signed-off-by: Alexandre Demers <alexandre.f.demers@gmail.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Alexandre Demers 2016-02-10 09:45:46 -05:00 • committed by Marek Olšák
parent 5e8db898fd
commit 111602e159
1 changed files with 4 additions and 2 deletions
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6
src/gallium/winsys/radeon/drm/radeon_drm_winsys.c
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@ -405,8 +405,10 @@ static boolean do_winsys_init(struct radeon_drm_winsys *ws)
radeon_get_drm_value(ws->fd, RADEON_INFO_NUM_TILE_PIPES, NULL,
&ws->info.num_tile_pipes);
/* The kernel returns 12 for some cards for an unknown reason.
* I thought this was supposed to be a power of two.
/* "num_tiles_pipes" must be equal to the number of pipes (Px) in the
/* pipe config field of the GB_TILE_MODE array. Only one card (Tahiti)
/* reports a different value (12). Fix it by setting what's in the
/* GB_TILE_MODE array (8).
*/
if (ws->gen == DRV_SI && ws->info.num_tile_pipes == 12)
ws->info.num_tile_pipes = 8;