Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
Documentation/gpu/amdgpu/flashing.rst | 33 +++++++++++++++++++++++++
Documentation/gpu/amdgpu/index.rst | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 16 ++++++++++++
3 files changed, 50 insertions(+)
create mode 100644 Documentation/gpu/amdgpu/flashing.rst
diff --git a/Documentation/gpu/amdgpu/flashing.rst b/Documentation/gpu/amdgpu/flashing.rst
new file mode 100644
index 0000000000000..bd745c42a538f
--- /dev/null
+++ b/Documentation/gpu/amdgpu/flashing.rst
@@ -0,0 +1,33 @@
+=======================
+ dGPU firmware flashing
+=======================
+
+IFWI
+----
+Flashing the dGPU integrated firmware image (IFWI) is supported by GPUs that
+use the PSP to orchestrate the update (Navi3x or newer GPUs).
+For supported GPUs, `amdgpu` will export a series of sysfs files that can be
+used for the flash process.
+
+The IFWI flash process is:
+
+1. Ensure the IFWI image is intended for the dGPU on the system.
+2. "Write" the IFWI image to the sysfs file `psp_vbflash`. This will stage the IFWI in memory.
+3. "Read" from the `psp_vbflash` sysfs file to initiate the flash process.
+4. Poll the `psp_vbflash_status` sysfs file to determine when the flash process completes.
+
+USB-C PD F/W
+------------
+On GPUs that support flashing an updated USB-C PD firmware image, the process
+is done using the `usbc_pd_fw` sysfs file.
+
+* Reading the file will provide the current firmware version.
+* Writing the name of a firmware payload stored in `/lib/firmware/amdgpu` to the sysfs file will initiate the flash process.
+
+The firmware payload stored in `/lib/firmware/amdgpu` can be named any name
+as long as it doesn't conflict with other existing binaries that are used by
+`amdgpu`.
+
+sysfs files
+-----------
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
diff --git a/Documentation/gpu/amdgpu/index.rst b/Documentation/gpu/amdgpu/index.rst
index 03c2966cae798..912e699fd3731 100644
--- a/Documentation/gpu/amdgpu/index.rst
+++ b/Documentation/gpu/amdgpu/index.rst
@@ -10,6 +10,7 @@ Next (GCN), Radeon DNA (RDNA), and Compute DNA (CDNA) architectures.
module-parameters
driver-core
display/index
+ flashing
xgmi
ras
thermal
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
index 7872004ed7f9b..047760bafcc23 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
@@ -3476,6 +3476,11 @@ void psp_copy_fw(struct psp_context *psp, uint8_t *start_addr, uint32_t bin_size
drm_dev_exit(idx);
}
+/**
+ * DOC: usbc_pd_fw
+ * Reading from this file will retrieve the USB-C PD firmware version. Writing to
+ * this file will trigger the update process.
+ */
static DEVICE_ATTR(usbc_pd_fw, S_IRUGO | S_IWUSR,
psp_usbc_pd_fw_sysfs_read,
psp_usbc_pd_fw_sysfs_write);
@@ -3569,6 +3574,11 @@ static ssize_t amdgpu_psp_vbflash_read(struct file *filp, struct kobject *kobj,
return 0;
}
+/**
+ * DOC: psp_vbflash
+ * Writing to this file will stage an IFWI for update. Reading from this file
+ * will trigger the update process.
+ */
static struct bin_attribute psp_vbflash_bin_attr = {
.attr = {.name = "psp_vbflash", .mode = 0660},
.size = 0,
@@ -3576,6 +3586,12 @@ static struct bin_attribute psp_vbflash_bin_attr = {
.read = amdgpu_psp_vbflash_read,
};
+/**
+ * DOC: psp_vbflash_status
+ * The status of the flash process.
+ * 0: IFWI flash not complete.
+ * 1: IFWI flash complete.
+ */
static ssize_t amdgpu_psp_vbflash_status(struct device *dev,
struct device_attribute *attr,
char *buf)
--
2.34.1
