Setup the EHCI internal buffer (before EHCI driver has a chance to touch the
registers) using the pre_setup() method in 'struct usb_ehci_pdata'.
The patch has been tested on the Marzen board.
Signed-off-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
Acked-by: Simon Horman <horms+rene...@verge.net.au>
---
Changes since version 4:
- refreshed the patch.
Changes since version 3:
- lowercased the SoC name in the subject.
Changes since version 2:
- added #include <linux/usb/hcd.h>;
- added a note about testing to the changelog;
- added ACKs from Simon Horman and Kuninori Morimoto.
Changes since the original posting:
- changed from init() platform device method to pre_setup() as per the previous
patch.
arch/arm/mach-shmobile/setup-r8a7779.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
Index: renesas/arch/arm/mach-shmobile/setup-r8a7779.c
===================================================================
--- renesas.orig/arch/arm/mach-shmobile/setup-r8a7779.c
+++ renesas/arch/arm/mach-shmobile/setup-r8a7779.c
@@ -33,6 +33,7 @@
#include <linux/sh_timer.h>
#include <linux/dma-mapping.h>
#include <linux/usb/otg.h>
+#include <linux/usb/hcd.h>
#include <linux/usb/ehci_pdriver.h>
#include <linux/usb/ohci_pdriver.h>
#include <linux/pm_runtime.h>
@@ -435,10 +436,25 @@ static void usb_power_off(struct platfor
pm_runtime_disable(&pdev->dev);
}
+static int ehci_init_internal_buffer(struct usb_hcd *hcd)
+{
+ /*
+ * Below are recommended values from the datasheet;
+ * see [USB :: Setting of EHCI Internal Buffer].
+ */
+ /* EHCI IP internal buffer setting */
+ iowrite32(0x00ff0040, hcd->regs + 0x0094);
+ /* EHCI IP internal buffer enable */
+ iowrite32(0x00000001, hcd->regs + 0x009C);
+
+ return 0;
+}
+
static struct usb_ehci_pdata ehcix_pdata = {
.power_on = usb_power_on,
.power_off = usb_power_off,
.power_suspend = usb_power_off,
+ .pre_setup = ehci_init_internal_buffer,
};
static struct resource ehci0_resources[] = {
--
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