diff options
| -rw-r--r-- | src/ast_vgatool.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/src/ast_vgatool.c b/src/ast_vgatool.c index 063775b..a22eb6d 100644 --- a/src/ast_vgatool.c +++ b/src/ast_vgatool.c @@ -432,11 +432,27 @@ ASTGetDRAMInfo(ScrnInfoPtr pScrn) *(ULONG *) (pAST->MMIOVirtualAddr + 0xF004) = 0x1e6e0000; *(ULONG *) (pAST->MMIOVirtualAddr + 0xF000) = 0x1; - *(ULONG *) (pAST->MMIOVirtualAddr + 0x10000) = 0xFC600309; - do { - ; - } while (*(volatile ULONG *) (pAST->MMIOVirtualAddr + 0x10000) != 0x01); + /* Based on the Linux DRM driver we might not be able to access this + * If we can't just use some sane defaults. + * + * See drm/drivers/gpu/drm/ast/ast_main.c line 295. + */ + *(ULONG *) (pAST->MMIOVirtualAddr + 0x10000) = 0xFC600309; + for (ulData = 10000; ulData > 0; ulData--) + if (*(volatile ULONG *) (pAST->MMIOVirtualAddr + 0x10000) == 0x01) + break; + + if (ulData == 0) { + xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Unable to read DRAM information, using defaults\n"); + pAST->ulDRAMBusWidth = 16; + pAST->jDRAMType = DRAMTYPE_1Gx16; + if (pAST->jChipType == AST2500) + pAST->ulMCLK = 800; + else + pAST->ulMCLK = 396; + return; + } ulData = *(volatile ULONG *) (pAST->MMIOVirtualAddr + 0x10004); /* Get BusWidth */ |