[RFC PATCH v2 3/4] usb: dwc3: Add device property sgl-trb-cache-size-quirk

[Tejas Joglekar <Tejas.Joglekar@xxxxxxxxxxxx>]

This commit adds the sgl-trb-cache-size-quirk property to enable
quirk for the XHCI driver with Synopsys xHC. This property is
enabled as initial property for the dwc3-haps driver.

Signed-off-by: Tejas Joglekar <joglekar@xxxxxxxxxxxx>
---
 Changes in v2:
 - Renamed the property

 drivers/usb/dwc3/core.c      | 2 ++
 drivers/usb/dwc3/core.h      | 2 ++
 drivers/usb/dwc3/dwc3-haps.c | 1 +
 drivers/usb/dwc3/host.c      | 6 +++++-
 4 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index ab6323b8e323..beb95f5fdce3 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1303,6 +1303,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 				"snps,usb3_lpm_capable");
 	dwc->usb2_lpm_disable = device_property_read_bool(dev,
 				"snps,usb2-lpm-disable");
+	dwc->sgl_trb_cache_size_quirk = device_property_read_bool(dev,
+				"snps,sgl-trb-cache-size-quirk");
 	device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
 				&rx_thr_num_pkt_prd);
 	device_property_read_u8(dev, "snps,rx-max-burst-prd",
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index bfc5c780a963..10647cbeea68 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1007,6 +1007,7 @@ struct dwc3_scratchpad_array {
  *			not needed for DWC_usb31 version 1.70a-ea06 and below
  * @usb3_lpm_capable: set if hadrware supports Link Power Management
  * @usb2_lpm_disable: set to disable usb2 lpm
+ * @sgl_trb_cache_size_quirk: set to enable the SG list consolidation
  * @disable_scramble_quirk: set if we enable the disable scramble quirk
  * @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
  * @u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
@@ -1206,6 +1207,7 @@ struct dwc3 {
 	unsigned		dis_start_transfer_quirk:1;
 	unsigned		usb3_lpm_capable:1;
 	unsigned		usb2_lpm_disable:1;
+	unsigned		sgl_trb_cache_size_quirk:1;
 
 	unsigned		disable_scramble_quirk:1;
 	unsigned		u2exit_lfps_quirk:1;
diff --git a/drivers/usb/dwc3/dwc3-haps.c b/drivers/usb/dwc3/dwc3-haps.c
index 3cecbf169452..9311cbe5f264 100644
--- a/drivers/usb/dwc3/dwc3-haps.c
+++ b/drivers/usb/dwc3/dwc3-haps.c
@@ -29,6 +29,7 @@ static const struct property_entry initial_properties[] = {
 	PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
 	PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
 	PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
+	PROPERTY_ENTRY_BOOL("snps,sgl-trb-cache-size-quirk"),
 	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
 	{ },
 };
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index 86dbd012b984..c1d851ff39b1 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -44,7 +44,7 @@ static int dwc3_host_get_irq(struct dwc3 *dwc)
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
-	struct property_entry	props[4];
+	struct property_entry	props[5];
 	struct platform_device	*xhci;
 	int			ret, irq;
 	struct resource		*res;
@@ -95,6 +95,10 @@ int dwc3_host_init(struct dwc3 *dwc)
 	if (dwc->usb2_lpm_disable)
 		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
 
+	if (dwc->sgl_trb_cache_size_quirk)
+		props[prop_idx++] =
+			PROPERTY_ENTRY_BOOL("sgl-trb-cache-size-quirk");
+
 	/**
 	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 	 * where Port Disable command doesn't work.
-- 
2.11.0