[PATCH v3 2/3] drm/amdgpu: Add USBC PD FW load to PSP 11

[Luben Tuikov]

On 2020-03-03 17:02, Andrey Grodzovsky wrote:
> Add the programming sequence.
> 
> v2:
> Change donwload wait loop to more efficient.
> Move C2PMSG_CMD_GFX_USB_PD_FW_VER defintion
> 
> v3: Fix lack of loop counter increment typo
> 
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/psp_gfx_if.h |  3 ++
>  drivers/gpu/drm/amd/amdgpu/psp_v11_0.c  | 82 +++++++++++++++++++++++++++++++++
>  2 files changed, 85 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/psp_gfx_if.h b/drivers/gpu/drm/amd/amdgpu/psp_gfx_if.h
> index 36b6579..a44fd60 100644
> --- a/drivers/gpu/drm/amd/amdgpu/psp_gfx_if.h
> +++ b/drivers/gpu/drm/amd/amdgpu/psp_gfx_if.h
> @@ -31,6 +31,9 @@
>  #define GFX_CMD_RESERVED_MASK       0x7FF00000
>  #define GFX_CMD_RESPONSE_MASK       0x80000000
>  
> +/* USBC PD FW version retrieval command */
> +#define C2PMSG_CMD_GFX_USB_PD_FW_VER 0x2000000
> +
>  /* TEE Gfx Command IDs for the register interface.
>  *  Command ID must be between 0x00010000 and 0x000F0000.
>  */
> diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
> index 8ab3bf3..3db1c0d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
> @@ -65,6 +65,9 @@ MODULE_FIRMWARE("amdgpu/arcturus_ta.bin");
>  /* memory training timeout define */
>  #define MEM_TRAIN_SEND_MSG_TIMEOUT_US	3000000
>  
> +/* For large FW files the time to complete can be very long */
> +#define USBC_PD_POLLING_LIMIT_S 240
> +
>  static int psp_v11_0_init_microcode(struct psp_context *psp)
>  {
>  	struct amdgpu_device *adev = psp->adev;
> @@ -1109,6 +1112,83 @@ static void psp_v11_0_ring_set_wptr(struct psp_context *psp, uint32_t value)
>  		WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_67, value);
>  }
>  
> +static int psp_v11_0_load_usbc_pd_fw(struct psp_context *psp, dma_addr_t dma_addr)
> +{
> +	struct amdgpu_device *adev = psp->adev;
> +	uint32_t reg_status;
> +	int ret, i = 0;
> +
> +	/* Write lower 32-bit address of the PD Controller FW */
> +	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_36, lower_32_bits(dma_addr));
> +	ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_35),
> +			     0x80000000, 0x80000000, false);
> +	if (ret)
> +		return ret;
> +
> +	/* Fireup interrupt so PSP can pick up the lower address */
> +	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_35, 0x800000);
> +	ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_35),
> +			     0x80000000, 0x80000000, false);
> +	if (ret)
> +		return ret;
> +
> +	reg_status = RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_35);
> +
> +	if ((reg_status & 0xFFFF) != 0) {
> +		DRM_ERROR("Lower address load failed - MP0_SMN_C2PMSG_35.Bits [15:0] = %02x...\n",
> +				reg_status & 0xFFFF);
> +		return -EIO;
> +	}
> +
> +	/* Write upper 32-bit address of the PD Controller FW */
> +	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_36, upper_32_bits(dma_addr));
> +
> +	ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_35),
> +			     0x80000000, 0x80000000, false);
> +	if (ret)
> +		return ret;
> +
> +	/* Fireup interrupt so PSP can pick up the upper address */
> +	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_35, 0x4000000);
> +
> +	/* FW load takes very long time */
> +	do {
> +		msleep(1000);
> +		reg_status = RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_35);
> +
> +		if (reg_status & 0x80000000)
> +			goto done;
> +
> +	} while(i++ < USBC_PD_POLLING_LIMIT_S);

1. The LKCS wants a space after a keyword ("while") and before parenthesis "(".

2. In do-while loops, you want to pre-increment, in order to account for the
   already executed iteration of the loop, since the check is done _after_
   the loop executes, in contrast to "for" and "while" loops. So you'll need
   to do this:

   } while (++i < USBC_PD_POLLING_LIMIT_S);

> +
> +	return -ETIME;
> +done:
> +	reg_status = RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_35);

3. You had _just_ read the register, right before the goto jump.
   You do not need to read it again. (Else a race would exist,
   and you'd need to poll, _again_.) You shouldn't have to
   read it again.

> +
> +	if ((reg_status & 0xFFFF) != 0) {
> +		DRM_ERROR("Upper address load failed - MP0_SMN_C2PMSG_35.Bits [15:0] = x%04x\n",
> +				reg_status & 0xFFFF);
> +		return -EIO;
> +	}

With those fixed, this patch is,
Reviewed-by: Luben Tuikov <luben.tuikov at amd.com>

Regards,
Luben



> +
> +	return 0;
> +}
> +
> +static int psp_v11_0_read_usbc_pd_fw(struct psp_context *psp, uint32_t *fw_ver)
> +{
> +	struct amdgpu_device *adev = psp->adev;
> +	int ret;
> +
> +	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_35, C2PMSG_CMD_GFX_USB_PD_FW_VER);
> +
> +	ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_35),
> +				     0x80000000, 0x80000000, false);
> +	if (!ret)
> +		*fw_ver = RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_36);
> +
> +	return ret;
> +}
> +
>  static const struct psp_funcs psp_v11_0_funcs = {
>  	.init_microcode = psp_v11_0_init_microcode,
>  	.bootloader_load_kdb = psp_v11_0_bootloader_load_kdb,
> @@ -1133,6 +1213,8 @@ static const struct psp_funcs psp_v11_0_funcs = {
>  	.mem_training = psp_v11_0_memory_training,
>  	.ring_get_wptr = psp_v11_0_ring_get_wptr,
>  	.ring_set_wptr = psp_v11_0_ring_set_wptr,
> +	.load_usbc_pd_fw = psp_v11_0_load_usbc_pd_fw,
> +	.read_usbc_pd_fw = psp_v11_0_read_usbc_pd_fw
>  };
>  
>  void psp_v11_0_set_psp_funcs(struct psp_context *psp)
>