msm: 8064: usb: Allow msm_bus vote when cable is connected
Drivers need to specify their bandwidth requirements to
bus-scaling driver to get guaranteed bandwidth on fabrics.
USB hardware uses a single buffer to transfer data across the
bus. As a result USB performance is highly dependent on system
fabric frequency as USB controller continuously sends NAKs on
the USB BUS unless complete buffer is filled/drained to the memory.
Hence, request for high bus bandwidth as long as USB cable is
connected to improve USB throughput.
Change-Id: I648755f1f7916c2b23e1eecf6cfdb66905792399
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-8064.c b/arch/arm/mach-msm/board-8064.c
index 9d4f0aa..c589026 100644
--- a/arch/arm/mach-msm/board-8064.c
+++ b/arch/arm/mach-msm/board-8064.c
@@ -469,12 +469,50 @@
},
};
+/* Bandwidth requests (zero) if no vote placed */
+static struct msm_bus_vectors usb_init_vectors[] = {
+ {
+ .src = MSM_BUS_MASTER_SPS,
+ .dst = MSM_BUS_SLAVE_EBI_CH0,
+ .ab = 0,
+ .ib = 0,
+ },
+};
+
+/* Bus bandwidth requests in Bytes/sec */
+static struct msm_bus_vectors usb_max_vectors[] = {
+ {
+ .src = MSM_BUS_MASTER_SPS,
+ .dst = MSM_BUS_SLAVE_EBI_CH0,
+ .ab = 60000000, /* At least 480Mbps on bus. */
+ .ib = 960000000, /* MAX bursts rate */
+ },
+};
+
+static struct msm_bus_paths usb_bus_scale_usecases[] = {
+ {
+ ARRAY_SIZE(usb_init_vectors),
+ usb_init_vectors,
+ },
+ {
+ ARRAY_SIZE(usb_max_vectors),
+ usb_max_vectors,
+ },
+};
+
+static struct msm_bus_scale_pdata usb_bus_scale_pdata = {
+ usb_bus_scale_usecases,
+ ARRAY_SIZE(usb_bus_scale_usecases),
+ .name = "usb",
+};
+
static struct msm_otg_platform_data msm_otg_pdata = {
.mode = USB_OTG,
.otg_control = OTG_PMIC_CONTROL,
.phy_type = SNPS_28NM_INTEGRATED_PHY,
.pmic_id_irq = PM8921_USB_ID_IN_IRQ(PM8921_IRQ_BASE),
.power_budget = 750,
+ .bus_scale_table = &usb_bus_scale_pdata,
};
static struct msm_usb_host_platform_data msm_ehci_host_pdata = {