[PATCH v1 2/2] usb: dwc3: core: Obtain imod_interval from device tree

[Badhri Jagan Sridharan]

Although commit cf40b86b6ef6 ("usb: dwc3: Implement interrupt
moderation") adds support for interrupt moderation in device
mode, it does not add an option to enable interrupt moderation
unless the version of the controller is 3.00a where the
interrupt moderation is automatically enabled. This patch
reads the interrupt moderation interval counter value from
device tree so that the interrupt moderation can be enabled
through the device tree.

The explicit initialization to 0 can be avoided as the dwc3
struct is kzalloc'ed.

Cc: stable@xxxxxxxxxx
Fixes: cf40b86b6ef6 ("usb: dwc3: Implement interrupt moderation")
Signed-off-by: Badhri Jagan Sridharan <badhri@xxxxxxxxxx>
---
 drivers/usb/dwc3/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index dfa1b5fe48dc..be0d302bbab7 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1818,6 +1818,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	dwc->dis_split_quirk = device_property_read_bool(dev,
 				"snps,dis-split-quirk");
 
+	device_property_read_u16(dev, "snps,device-mode-intrpt-mod-interval",
+				 &dwc->imod_interval);
+
 	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
 	dwc->tx_de_emphasis = tx_de_emphasis;
 
@@ -1835,8 +1838,6 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd;
 	dwc->tx_max_burst_prd = tx_max_burst_prd;
 
-	dwc->imod_interval = 0;
-
 	dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num;
 }
 
-- 
2.48.1.362.g079036d154-goog