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ati-vga: Add dummy MEM_SDRAM_MODE_REG

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Radeon chips have an SDRAM mode reg that is accessed by some drivers.
We don't emulate the memory controller but provide some default value
to prevent drivers getting unexpected 0.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: cc1324b9ef06beb8ae233ddc77dedd8bab9b8624.1592737958.git.balaton@eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2020-06-21 13:12:38 +02:00 committed by Gerd Hoffmann
parent 41977c65c0
commit 2bbcaa7cd6
3 changed files with 7 additions and 0 deletions
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5
hw/display/ati.c
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@ -361,6 +361,11 @@ static uint64_t ati_mm_read(void *opaque, hwaddr addr, unsigned int size)
case MC_STATUS:
val = 5;
break;
case MEM_SDRAM_MODE_REG:
if (s->dev_id != PCI_DEVICE_ID_ATI_RAGE128_PF) {
val = BIT(28) | BIT(20);
}
break;
case RBBM_STATUS:
case GUI_STAT:
val = 64; /* free CMDFIFO entries */

1
hw/display/ati_dbg.c
View File

@ -42,6 +42,7 @@ static struct ati_regdesc ati_reg_names[] = {
{"MC_FB_LOCATION", 0x0148},
{"MC_AGP_LOCATION", 0x014C},
{"MC_STATUS", 0x0150},
{"MEM_SDRAM_MODE_REG", 0x0158},
{"MEM_POWER_MISC", 0x015c},
{"AGP_BASE", 0x0170},
{"AGP_CNTL", 0x0174},

1
hw/display/ati_regs.h
View File

@ -60,6 +60,7 @@
#define MC_FB_LOCATION 0x0148
#define MC_AGP_LOCATION 0x014C
#define MC_STATUS 0x0150
#define MEM_SDRAM_MODE_REG 0x0158
#define MEM_POWER_MISC 0x015c
#define AGP_BASE 0x0170
#define AGP_CNTL 0x0174