XLibre/xf86-video-ast
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Do not hang if P2A is disabled, using sensible defaults instead.

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Based on Linux DRM https://patchwork.kernel.org/patch/9578793/
This commit is contained in:
Daniel O'Connor
2020-09-18 00:00:28 +09:30
committed by Alan Coopersmith
parent 773f703d92
commit 0e0fd56d9f
1 changed files with 20 additions and 4 deletions
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24
src/ast_vgatool.c
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@@ -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 */