[bug report] drm/amd: Enable SMU 15_0_0 support

[Dan Carpenter <error27@gmail.com>]

Hello Pratik Vishwakarma,

Commit c7fc0f372374 ("drm/amd: Enable SMU 15_0_0 support") from Dec
5, 2025 (linux-next), leads to the following Smatch static checker
warning:

	drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu15/smu_v15_0.c:135 smu_v15_0_load_microcode()
	error: uninitialized symbol 'mp1_fw_flags'.

drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu15/smu_v15_0.c
    109 int smu_v15_0_load_microcode(struct smu_context *smu)
    110 {
    111         struct amdgpu_device *adev = smu->adev;
    112         const uint32_t *src;
    113         const struct smc_firmware_header_v1_0 *hdr;
    114         uint32_t addr_start = MP1_SRAM;
    115         uint32_t i;
    116         uint32_t smc_fw_size;
    117         uint32_t mp1_fw_flags;
    118 
    119         hdr = (const struct smc_firmware_header_v1_0 *) adev->pm.fw->data;
    120         src = (const uint32_t *)(adev->pm.fw->data +
    121                                  le32_to_cpu(hdr->header.ucode_array_offset_bytes));
    122         smc_fw_size = hdr->header.ucode_size_bytes;
    123 
    124         for (i = 1; i < smc_fw_size/4 - 1; i++) {
    125                 WREG32_PCIE(addr_start, src[i]);
    126                 addr_start += 4;
    127         }
    128 
    129 
    130         for (i = 0; i < adev->usec_timeout; i++) {
    131                 if (smu->is_apu)
    132                         mp1_fw_flags = RREG32_PCIE(MP1_Public |
    133                                                    (smnMP1_FIRMWARE_FLAGS & 0xffffffff));

mp1_fw_flags is uninitialized if smu->is_apu is false.

    134 
--> 135                 if ((mp1_fw_flags & MP1_CRU1_MP1_FIRMWARE_FLAGS__INTERRUPTS_ENABLED_MASK) >>
    136                     MP1_CRU1_MP1_FIRMWARE_FLAGS__INTERRUPTS_ENABLED__SHIFT)
    137                         break;
    138                 udelay(1);
    139         }
    140 
    141         if (i == adev->usec_timeout)
    142                 return -ETIME;
    143 
    144         return 0;
    145 }

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regards,
dan carpenter