[Patch v2 1/3] misc: pch_phub: Read prefetch value from device tree if passed
From: Zubair Lutfullah Kakakhel <hidden>
Date: 2016-08-12 11:49:19
Also in:
lkml
Subsystem:
char and misc drivers, the rest · Maintainers:
Arnd Bergmann, Greg Kroah-Hartman, Linus Torvalds
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 <redacted> --- V1 -> V2 added #include <linux/of.h> --- drivers/misc/pch_phub.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/pch_phub.c b/drivers/misc/pch_phub.c
index 4810e03..1dd18f5 100644
--- a/drivers/misc/pch_phub.c
+++ b/drivers/misc/pch_phub.c@@ -28,6 +28,7 @@ #include <linux/if_ether.h> #include <linux/ctype.h> #include <linux/dmi.h> +#include <linux/of.h> #define PHUB_STATUS 0x00 /* Status Register offset */ #define PHUB_CONTROL 0x04 /* Control Register offset */
@@ -711,6 +712,12 @@ 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 +743,7 @@ 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