usb: dwc2: Add new parameter eusb2_disc

Added new parameter eusb2_disc to list of core parameters which specify
whether eUSB2 PHY disconnect support flow applicable or no.
Set to false as default value and checked core version if set to true.
This parameter applicable in device mode of HSOTG and HS IOT cores
v5.00 or higher.

Added print this parameter in show parameters of debugfs.

Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/e77cc4312bda797d1ddaa4351d86c65a69c8b926.1708948356.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 0c10bd0c32fdfe8afb32ae5e53e8e6bb483a60a9..16d6ac97f23b3cace9283eed3d5f837aad515b06 100644 (file)
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -288,6 +288,11 @@ enum dwc2_ep0_state {
  *                      core has been configured to work at either data path
  *                      width.
  *                       8 or 16 (default 16 if available)
+ * @eusb2_disc:         Specifies whether eUSB2 PHY disconnect support flow
+ *                      applicable or no. Applicable in device mode of HSOTG
+ *                      and HS IOT cores v5.00 or higher.
+ *                       0 - eUSB2 PHY disconnect support flow not applicable
+ *                       1 - eUSB2 PHY disconnect support flow applicable
  * @phy_ulpi_ddr:       Specifies whether the ULPI operates at double or single
  *                      data rate. This parameter is only applicable if phy_type
  *                      is ULPI.
@@ -442,6 +447,7 @@ struct dwc2_core_params {
 #define DWC2_SPEED_PARAM_LOW   2
 
        u8 phy_utmi_width;
+       bool eusb2_disc;
        bool phy_ulpi_ddr;
        bool phy_ulpi_ext_vbus;
        bool enable_dynamic_fifo;

diff --git a/drivers/usb/dwc2/debugfs.c b/drivers/usb/dwc2/debugfs.c
index 1d72ece9cfe480d15b0a733bc3ad7e3e869d49c5..7c82ab590401a87b56db607a8a55fb576884a1c8 100644 (file)
--- a/drivers/usb/dwc2/debugfs.c
+++ b/drivers/usb/dwc2/debugfs.c
@@ -686,6 +686,7 @@ static int params_show(struct seq_file *seq, void *v)
        print_param(seq, p, host_channels);
        print_param(seq, p, phy_type);
        print_param(seq, p, phy_utmi_width);
+       print_param(seq, p, eusb2_disc);
        print_param(seq, p, phy_ulpi_ddr);
        print_param(seq, p, phy_ulpi_ext_vbus);
        print_param(seq, p, i2c_enable);

diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index eb677c3cfd0b62677a1e51502d3a78f1d68cdef2..c47524483f48afa15692ef2ae3a2ca52ad05a6ac 100644 (file)
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -475,6 +475,7 @@ static void dwc2_set_default_params(struct dwc2_hsotg *hsotg)
        dwc2_set_param_lpm(hsotg);
        p->phy_ulpi_ddr = false;
        p->phy_ulpi_ext_vbus = false;
+       p->eusb2_disc = false;
 
        p->enable_dynamic_fifo = hw->enable_dynamic_fifo;
        p->en_multiple_tx_fifo = hw->en_multiple_tx_fifo;
@@ -737,6 +738,25 @@ static void dwc2_check_param_tx_fifo_sizes(struct dwc2_hsotg *hsotg)
        }
 }
 
+static void dwc2_check_param_eusb2_disc(struct dwc2_hsotg *hsotg)
+{
+       u32 gsnpsid;
+
+       if (!hsotg->params.eusb2_disc)
+               return;
+       gsnpsid = dwc2_readl(hsotg, GSNPSID);
+       /*
+        * eusb2_disc not supported by FS IOT devices.
+        * For other cores, it supported starting from version 5.00a
+        */
+       if ((gsnpsid & ~DWC2_CORE_REV_MASK) == DWC2_FS_IOT_ID ||
+           (gsnpsid & DWC2_CORE_REV_MASK) <
+           (DWC2_CORE_REV_5_00a & DWC2_CORE_REV_MASK)) {
+               hsotg->params.eusb2_disc = false;
+               return;
+       }
+}
+
 #define CHECK_RANGE(_param, _min, _max, _def) do {                     \
                if ((int)(hsotg->params._param) < (_min) ||             \
                    (hsotg->params._param) > (_max)) {                  \
@@ -765,6 +785,8 @@ static void dwc2_check_params(struct dwc2_hsotg *hsotg)
        dwc2_check_param_speed(hsotg);
        dwc2_check_param_phy_utmi_width(hsotg);
        dwc2_check_param_power_down(hsotg);
+       dwc2_check_param_eusb2_disc(hsotg);
+
        CHECK_BOOL(enable_dynamic_fifo, hw->enable_dynamic_fifo);
        CHECK_BOOL(en_multiple_tx_fifo, hw->en_multiple_tx_fifo);
        CHECK_BOOL(i2c_enable, hw->i2c_enable);