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drm/amdgpu: add a retry for IP discovery init 

commit 3938eb956e upstream.

AMD dGPUs have integrated FW that runs as soon as the
device gets power and initializes the board (determines
the amount of memory, provides configuration details to
the driver, etc.).  For direct PCIe attached cards this
happens as soon as power is applied and normally completes
well before the OS has even started loading.  However, with
hotpluggable ports like USB4, the driver needs to wait for
this to complete before initializing the device.

This normally takes 60-100ms, but could take longer on
some older boards periodically due to memory training.

Retry for up to a second.  In the non-hotplug case, there
should be no change in behavior and this should complete
on the first try.

v2: adjust test criteria
v3: adjust checks for the masks, only enable on removable devices
v4: skip bif_fb_en check

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2925
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher 2023-10-19 13:56:56 -04:00 committed by Greg Kroah-Hartman
parent a5bd0c0d31
commit 6f61775580
1 changed files with 21 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
View File

@ -92,6 +92,7 @@
MODULE_FIRMWARE(FIRMWARE_IP_DISCOVERY);
#define mmRCC_CONFIG_MEMSIZE 0xde3
#define mmMP0_SMN_C2PMSG_33 0x16061
#define mmMM_INDEX 0x0
#define mmMM_INDEX_HI 0x6
#define mmMM_DATA 0x1
@ -230,8 +231,26 @@ static int amdgpu_discovery_read_binary_from_sysmem(struct amdgpu_device *adev,
static int amdgpu_discovery_read_binary_from_mem(struct amdgpu_device *adev,
uint8_t *binary)
{
uint64_t vram_size = (uint64_t)RREG32(mmRCC_CONFIG_MEMSIZE) << 20;
int ret = 0;
uint64_t vram_size;
u32 msg;
int i, ret = 0;
/* It can take up to a second for IFWI init to complete on some dGPUs,
* but generally it should be in the 60-100ms range. Normally this starts
* as soon as the device gets power so by the time the OS loads this has long
* completed. However, when a card is hotplugged via e.g., USB4, we need to
* wait for this to complete. Once the C2PMSG is updated, we can
* continue.
*/
if (dev_is_removable(&adev->pdev->dev)) {
for (i = 0; i < 1000; i++) {
msg = RREG32(mmMP0_SMN_C2PMSG_33);
if (msg & 0x80000000)
break;
msleep(1);
}
}
vram_size = (uint64_t)RREG32(mmRCC_CONFIG_MEMSIZE) << 20;
if (vram_size) {
uint64_t pos = vram_size - DISCOVERY_TMR_OFFSET;