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

From 28b5c129ca6e585ec95c160ec4297bc6c6360b6f Mon Sep 17 00:00:00 2001
From: Minas Harutyunyan <minas.harutyunyan@synopsys.com>
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 <hminas@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---
 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
@@ -273,6 +273,23 @@ 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.
@@ -291,6 +308,7 @@ 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;
 
@@ -303,11 +321,6 @@ 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;