[PATCH v2] dwc3: make LPM configurable in DT

[Robert Baldyga]

This patch removes "Enable USB3 LPM Capability" option from Kconfig
and adds snps,usb3_lpm_capable devicetree property instead of it.

USB3 LPM (Link Power Management) capability is hardware property, and
it's platform dependent, so if our hardware supports this feature, we
want rather to configure it in devicetree than having it as Kconfig option.

Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
---

Changelog:

v2:
- addressed Felipe's comments

v1: https://lkml.org/lkml/2015/3/6/185

 Documentation/devicetree/bindings/usb/dwc3.txt | 1 +
 drivers/usb/dwc3/Kconfig                       | 7 -------
 drivers/usb/dwc3/core.c                        | 3 +++
 drivers/usb/dwc3/core.h                        | 2 ++
 drivers/usb/dwc3/host.c                        | 4 +---
 drivers/usb/dwc3/platform_data.h               | 1 +
 6 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index cd7f045..5cc3643 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -14,6 +14,7 @@ Optional properties:
  - phys: from the *Generic PHY* bindings
  - phy-names: from the *Generic PHY* bindings
  - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
+ - snps,usb3_lpm_capable: determines if platform is USB3 LPM capable
  - snps,disable_scramble_quirk: true when SW should disable data scrambling.
 	Only really useful for FPGA builds.
  - snps,has-lpm-erratum: true when DWC3 was configured with LPM Erratum enabled
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index edbf9c8..827c4f8 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -104,11 +104,4 @@ config USB_DWC3_DEBUG
 	help
 	  Say Y here to enable debugging messages on DWC3 Driver.
 
-config DWC3_HOST_USB3_LPM_ENABLE
-	bool "Enable USB3 LPM Capability"
-	depends on USB_DWC3_HOST=y || USB_DWC3_DUAL_ROLE=y
-	default n
-	help
-	  Select this when you want to enable USB3 LPM with dwc3 xhci host.
-
 endif
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 05b18ee..81b092b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -808,6 +808,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,is-utmi-l1-suspend");
 		of_property_read_u8(node, "snps,hird-threshold",
 				&hird_threshold);
+		dwc->usb3_lpm_capable = of_property_read_bool(node,
+				"snps,usb3_lpm_capable");
 
 		dwc->needs_fifo_resize = of_property_read_bool(node,
 				"tx-fifo-resize");
@@ -848,6 +850,7 @@ static int dwc3_probe(struct platform_device *pdev)
 			hird_threshold = pdata->hird_threshold;
 
 		dwc->needs_fifo_resize = pdata->tx_fifo_resize;
+		dwc->usb3_lpm_capable = pdata->usb3_lpm_capable;
 		dwc->dr_mode = pdata->dr_mode;
 
 		dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d201910..fdab715 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -689,6 +689,7 @@ struct dwc3_scratchpad_array {
  * @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
  * @start_config_issued: true when StartConfig command has been issued
  * @three_stage_setup: set if we perform a three phase setup
+ * @usb3_lpm_capable: set if hadrware supports Link Power Management
  * @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
@@ -812,6 +813,7 @@ struct dwc3 {
 	unsigned		setup_packet_pending:1;
 	unsigned		start_config_issued:1;
 	unsigned		three_stage_setup:1;
+	unsigned		usb3_lpm_capable:1;
 
 	unsigned		disable_scramble_quirk:1;
 	unsigned		u2exit_lfps_quirk:1;
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index 12bfd3c..c679f63 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -49,9 +49,7 @@ int dwc3_host_init(struct dwc3 *dwc)
 
 	memset(&pdata, 0, sizeof(pdata));
 
-#ifdef CONFIG_DWC3_HOST_USB3_LPM_ENABLE
-	pdata.usb3_lpm_capable = 1;
-#endif
+	pdata.usb3_lpm_capable = dwc->usb3_lpm_capable;
 
 	ret = platform_device_add_data(xhci, &pdata, sizeof(pdata));
 	if (ret) {
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index a3a3b6d5..a2bd464 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -24,6 +24,7 @@ struct dwc3_platform_data {
 	enum usb_device_speed maximum_speed;
 	enum usb_dr_mode dr_mode;
 	bool tx_fifo_resize;
+	bool usb3_lpm_capable;
 
 	unsigned is_utmi_l1_suspend:1;
 	u8 hird_threshold;
-- 
1.9.1

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