The default prefetch value for the eg20t device is hard coded to
0x000affaa.
Add support for an alternative to be read from DT if available
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@xxxxxxxxxx>
---
drivers/misc/pch_phub.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/pch_phub.c b/drivers/misc/pch_phub.c
index 4810e03..9b010a7 100644
--- a/drivers/misc/pch_phub.c
+++ b/drivers/misc/pch_phub.c
@@ -711,6 +711,12 @@ static int pch_phub_probe(struct pci_dev *pdev,
if (id->driver_data == 1) { /* EG20T PCH */
const char *board_name;
+ unsigned int prefetch = 0x000affaa;
+
+ if (pdev->dev.of_node)
+ of_property_read_u32(pdev->dev.of_node,
+ "intel,eg20t-prefetch",
+ &prefetch);
ret = sysfs_create_file(&pdev->dev.kobj,
&dev_attr_pch_mac.attr);
@@ -736,7 +742,7 @@ static int pch_phub_probe(struct pci_dev *pdev,
CLKCFG_UART_MASK);
/* set the prefech value */
- iowrite32(0x000affaa, chip->pch_phub_base_address + 0x14);
+ iowrite32(prefetch, chip->pch_phub_base_address + 0x14);
/* set the interrupt delay value */
iowrite32(0x25, chip->pch_phub_base_address + 0x44);
chip->pch_opt_rom_start_address = PCH_PHUB_ROM_START_ADDR_EG20T;
--
1.9.1
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