From 20f48be63d1ad0ffa359c9612612876544669339 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Thu, 19 Dec 2024 13:05:34 -0500 Subject: drm/amdgpu: add OEM i2c bus for polaris chips It uses the VGADCC bus. DC doesn't use this bus, so it is safe to add it here. Reviewed-by: Harry Wentland Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 32 ++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c index 263242bd7c10..e476e45b996a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c @@ -144,6 +144,38 @@ void amdgpu_atombios_i2c_init(struct amdgpu_device *adev) } } +void amdgpu_atombios_oem_i2c_init(struct amdgpu_device *adev, u8 i2c_id) +{ + struct atom_context *ctx = adev->mode_info.atom_context; + ATOM_GPIO_I2C_ASSIGMENT *gpio; + struct amdgpu_i2c_bus_rec i2c; + int index = GetIndexIntoMasterTable(DATA, GPIO_I2C_Info); + struct _ATOM_GPIO_I2C_INFO *i2c_info; + uint16_t data_offset, size; + int i, num_indices; + char stmp[32]; + + if (amdgpu_atom_parse_data_header(ctx, index, &size, NULL, NULL, &data_offset)) { + i2c_info = (struct _ATOM_GPIO_I2C_INFO *)(ctx->bios + data_offset); + + num_indices = (size - sizeof(ATOM_COMMON_TABLE_HEADER)) / + sizeof(ATOM_GPIO_I2C_ASSIGMENT); + + gpio = &i2c_info->asGPIO_Info[0]; + for (i = 0; i < num_indices; i++) { + i2c = amdgpu_atombios_get_bus_rec_for_i2c_gpio(gpio); + + if (i2c.valid && i2c.i2c_id == i2c_id) { + sprintf(stmp, "OEM 0x%x", i2c.i2c_id); + adev->i2c_bus[i] = amdgpu_i2c_create(adev_to_drm(adev), &i2c, stmp); + break; + } + gpio = (ATOM_GPIO_I2C_ASSIGMENT *) + ((u8 *)gpio + sizeof(ATOM_GPIO_I2C_ASSIGMENT)); + } + } +} + struct amdgpu_gpio_rec amdgpu_atombios_lookup_gpio(struct amdgpu_device *adev, u8 id) -- cgit v1.2.3