drm/amdgpu: add sdma ip block for navy_flounder

Navy_Flounder has the same sdma IP version with
sienna_cichlid, and it has 2 sdma controllers.

Signed-off-by: Jiansong Chen <[e-mail]>
Reviewed-by: Tao Zhou <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/nv.c

···
 		amdgpu_device_ip_block_add(adev, &gmc_v10_0_ip_block);
 		amdgpu_device_ip_block_add(adev, &navi10_ih_ip_block);
 		amdgpu_device_ip_block_add(adev, &gfx_v10_0_ip_block);
+		amdgpu_device_ip_block_add(adev, &sdma_v5_2_ip_block);
 		break;
 	default:
 		return -EINVAL;

drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c

···
 #include "sdma_v5_2.h"
 
 MODULE_FIRMWARE("amdgpu/sienna_cichlid_sdma.bin");
+MODULE_FIRMWARE("amdgpu/navy_flounder_sdma.bin");
 
 #define SDMA1_REG_OFFSET 0x600
 #define SDMA3_REG_OFFSET 0x400
···
 {
 	switch (adev->asic_type) {
 	case CHIP_SIENNA_CICHLID:
+	case CHIP_NAVY_FLOUNDER:
 		break;
 	default:
 		break;
···
 	case CHIP_SIENNA_CICHLID:
 		chip_name = "sienna_cichlid";
 		break;
+	case CHIP_NAVY_FLOUNDER:
+		chip_name = "navy_flounder";
+		break;
 	default:
 		BUG();
 	}
···
 		goto out;
 
 	for (i = 1; i < adev->sdma.num_instances; i++) {
-		if (adev->asic_type == CHIP_SIENNA_CICHLID) {
+		if (adev->asic_type == CHIP_SIENNA_CICHLID ||
+		    adev->asic_type == CHIP_NAVY_FLOUNDER) {
 			memcpy((void*)&adev->sdma.instance[i],
 			       (void*)&adev->sdma.instance[0],
 			       sizeof(struct amdgpu_sdma_instance));
···
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	adev->sdma.num_instances = 4;
+	switch (adev->asic_type) {
+	case CHIP_SIENNA_CICHLID:
+		adev->sdma.num_instances = 4;
+		break;
+	case CHIP_NAVY_FLOUNDER:
+		adev->sdma.num_instances = 2;
+		break;
+	default:
+		break;
+	}
 
 	sdma_v5_2_set_ring_funcs(adev);
 	sdma_v5_2_set_buffer_funcs(adev);
···
 
 	switch (adev->asic_type) {
 	case CHIP_SIENNA_CICHLID:
+	case CHIP_NAVY_FLOUNDER:
 		sdma_v5_2_update_medium_grain_clock_gating(adev,
 				state == AMD_CG_STATE_GATE ? true : false);
 		sdma_v5_2_update_medium_grain_light_sleep(adev,