Commit c1ef3a2f authored by Dave Jones's avatar Dave Jones Committed by Dave Jones

[AGPGART] Sanity check (and fix up broken) AGP modes when in AGP 3.0 mode.

parent 1b47caf5
...@@ -419,7 +419,31 @@ static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp) ...@@ -419,7 +419,31 @@ static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
if (!((*cmd & AGPSTAT_FW) && (*tmp & AGPSTAT_FW) && (*mode & AGPSTAT_FW))) if (!((*cmd & AGPSTAT_FW) && (*tmp & AGPSTAT_FW) && (*mode & AGPSTAT_FW)))
*cmd &= ~AGPSTAT_FW; *cmd &= ~AGPSTAT_FW;
/* Set speed. */ /*
* Set speed.
* Check for invalid speeds. This can happen when applications
* written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
*/
if (*mode & AGPSTAT_MODE_3_0) {
/*
* Caller hasn't a clue what its doing. We are in 3.0 mode,
* have been passed a 3.0 mode, but with 2.x speed bits set.
* AGP2.x 4x -> AGP3.0 4x.
*/
if (*mode & AGPSTAT2_4X) {
*mode &= ~AGPSTAT2_4X;
*mode |= AGPSTAT3_4X;
}
} else {
/*
* The caller doesn't know what they are doing. We are in 3.0 mode,
* but have been passed an AGP 2.x mode.
* Convert AGP 1x,2x,4x -> AGP 3.0 4x.
*/
*mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
*mode |= AGPSTAT3_4X;
}
if (!((*cmd & AGPSTAT3_8X) && (*tmp & AGPSTAT3_8X) && (*mode & AGPSTAT3_8X))) if (!((*cmd & AGPSTAT3_8X) && (*tmp & AGPSTAT3_8X) && (*mode & AGPSTAT3_8X)))
*cmd &= ~AGPSTAT3_8X; *cmd &= ~AGPSTAT3_8X;
......
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