habanalabs: remove power9 workaround for dma support

We don't need this workaround anymore.
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/habanalabs.h

@@ -2604,8 +2604,6 @@ struct hl_reset_info {
  * @in_debug: whether the device is in a state where the profiling/tracing infrastructure
  *            can be used. This indication is needed because in some ASICs we need to do
  *            specific operations to enable that infrastructure.
- * @power9_64bit_dma_enable: true to enable 64-bit DMA mask support. Relevant
- *                           only to POWER9 machines.
  * @cdev_sysfs_created: were char devices and sysfs nodes created.
  * @stop_on_err: true if engines should stop on error.
  * @supports_sync_stream: is sync stream supported.
@@ -2728,7 +2726,6 @@ struct hl_device {
 	u8				device_cpu_disabled;
 	u8				dma_mask;
 	u8				in_debug;
-	u8				power9_64bit_dma_enable;
 	u8				cdev_sysfs_created;
 	u8				stop_on_err;
 	u8				supports_sync_stream;

drivers/misc/habanalabs/common/pci/pci.c

@@ -338,10 +338,7 @@ int hl_pci_set_outbound_region(struct hl_device *hdev,
 				lower_32_bits(outbound_region_end_address));
 	rc |= hl_pci_iatu_write(hdev, 0x014, 0);
 
-	if ((hdev->power9_64bit_dma_enable) && (hdev->dma_mask == 64))
-		rc |= hl_pci_iatu_write(hdev, 0x018, 0x08000000);
-	else
-		rc |= hl_pci_iatu_write(hdev, 0x018, 0);
+	rc |= hl_pci_iatu_write(hdev, 0x018, 0);
 
 	rc |= hl_pci_iatu_write(hdev, 0x020,
 				upper_32_bits(outbound_region_end_address));

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -9008,14 +9008,7 @@ static void gaudi_reset_sob(struct hl_device *hdev, void *data)
 
 static void gaudi_set_dma_mask_from_fw(struct hl_device *hdev)
 {
-	if (RREG32(mmPSOC_GLOBAL_CONF_NON_RST_FLOPS_0) ==
-							HL_POWER9_HOST_MAGIC) {
-		hdev->power9_64bit_dma_enable = 1;
-		hdev->dma_mask = 64;
-	} else {
-		hdev->power9_64bit_dma_enable = 0;
-		hdev->dma_mask = 48;
-	}
+	hdev->dma_mask = 48;
 }
 
 static u64 gaudi_get_device_time(struct hl_device *hdev)

drivers/misc/habanalabs/goya/goya.c

@@ -5554,16 +5554,7 @@ static void goya_reset_sob_group(struct hl_device *hdev, u16 sob_group)
 
 static void goya_set_dma_mask_from_fw(struct hl_device *hdev)
 {
-	if (RREG32(mmPSOC_GLOBAL_CONF_NON_RST_FLOPS_0) ==
-							HL_POWER9_HOST_MAGIC) {
-		dev_dbg(hdev->dev, "Working in 64-bit DMA mode\n");
-		hdev->power9_64bit_dma_enable = 1;
-		hdev->dma_mask = 64;
-	} else {
-		dev_dbg(hdev->dev, "Working in 48-bit DMA mode\n");
-		hdev->power9_64bit_dma_enable = 0;
-		hdev->dma_mask = 48;
-	}
+	hdev->dma_mask = 48;
 }
 
 u64 goya_get_device_time(struct hl_device *hdev)