kernel: 4.19: Backport usb dwc2 lpm mode hw check

This patch backports verbatim the commit from Linux 5.2-rc7 that fixes
the warnings about invalid lpm related parameters on hardware which
don't that.

This is the case for e.g. lantiq xrx200 targets.

Supported only in Linux 4.17 an later.

Signed-off-by: Martin Schiller <[email protected]>
[refresh patches, fix commit title]
Signed-off-by: Mathias Kresin <[email protected]>

target/linux/cns3xxx/patches-4.19/210-dwc2_defaults.patch

@@ -37,7 +37,7 @@
  const struct of_device_id dwc2_of_match_table[] = {
  	{ .compatible = "brcm,bcm2835-usb", .data = dwc2_set_bcm_params },
  	{ .compatible = "hisilicon,hi6220-usb", .data = dwc2_set_his_params  },
-@@ -806,17 +836,23 @@ int dwc2_get_hwparams(struct dwc2_hsotg
+@@ -819,17 +849,23 @@ int dwc2_get_hwparams(struct dwc2_hsotg
  
  int dwc2_init_params(struct dwc2_hsotg *hsotg)
  {

target/linux/generic/backport-4.19/200-v5.2-usb-dwc2-Set-lpm-mode-parameters-depend-on-HW-configuration.patch

@@ -0,0 +1,63 @@
+From 28b5c129ca6e585ec95c160ec4297bc6c6360b6f Mon Sep 17 00:00:00 2001
+From: Minas Harutyunyan <[email protected]>
+Date: Mon, 4 Mar 2019 17:08:07 +0400
+Subject: usb: dwc2: Set lpm mode parameters depend on HW configuration
+
+If core not supported lpm, i.e. BCM2835 then confusing warnings seen
+in log.
+
+To avoid these warnings, added function dwc2_set_param_lpm() to set
+lpm and other lpm related parameters based on lpm support by core.
+
+Signed-off-by: Minas Harutyunyan <[email protected]>
+Signed-off-by: Felipe Balbi <[email protected]>
+---
+ drivers/usb/dwc2/params.c | 23 ++++++++++++++++++-----
+ 1 file changed, 18 insertions(+), 5 deletions(-)
+
+--- a/drivers/usb/dwc2/params.c
++++ b/drivers/usb/dwc2/params.c
+@@ -272,6 +272,23 @@ static void dwc2_set_param_power_down(st
+ 	hsotg->params.power_down = val;
+ }
+ 
++static void dwc2_set_param_lpm(struct dwc2_hsotg *hsotg)
++{
++	struct dwc2_core_params *p = &hsotg->params;
++
++	p->lpm = hsotg->hw_params.lpm_mode;
++	if (p->lpm) {
++		p->lpm_clock_gating = true;
++		p->besl = true;
++		p->hird_threshold_en = true;
++		p->hird_threshold = 4;
++	} else {
++		p->lpm_clock_gating = false;
++		p->besl = false;
++		p->hird_threshold_en = false;
++	}
++}
++
+ /**
+  * dwc2_set_default_params() - Set all core parameters to their
+  * auto-detected default values.
+@@ -290,6 +307,7 @@ static void dwc2_set_default_params(stru
+ 	dwc2_set_param_speed(hsotg);
+ 	dwc2_set_param_phy_utmi_width(hsotg);
+ 	dwc2_set_param_power_down(hsotg);
++	dwc2_set_param_lpm(hsotg);
+ 	p->phy_ulpi_ddr = false;
+ 	p->phy_ulpi_ext_vbus = false;
+ 
+@@ -302,11 +320,6 @@ static void dwc2_set_default_params(stru
+ 	p->reload_ctl = (hw->snpsid >= DWC2_CORE_REV_2_92a);
+ 	p->uframe_sched = true;
+ 	p->external_id_pin_ctl = false;
+-	p->lpm = true;
+-	p->lpm_clock_gating = true;
+-	p->besl = true;
+-	p->hird_threshold_en = true;
+-	p->hird_threshold = 4;
+ 	p->ipg_isoc_en = false;
+ 	p->max_packet_count = hw->max_packet_count;
+ 	p->max_transfer_size = hw->max_transfer_size;