linux-stable.git/drivers/phy/tegra, branch v6.0

phy: tegra: Add PCIe PIPE2UPHY support for Tegra234

2022-07-05T06:14:35+00:00

Synopsys DesignWare core based PCIe controllers in Tegra234 SoC
interface with Universal PHY (UPHY) module through a PIPE2UPHY (P2U)
module. For each PCIe lane of a controller, there is a P2U unit
instantiated at hardware level. This driver provides support for the
programming required for each P2U that is going to be used for a PCIe
controller.

Signed-off-by: Vidya Sagar 
Link: https://lore.kernel.org/r/20220629060435.25297-9-vidyas@nvidia.com
Signed-off-by: Vinod Koul

phy: tegra: xusb: Fix return value of tegra_xusb_find_port_node function

2021-12-14T07:37:21+00:00

callers of tegra_xusb_find_port_node() function only do NULL checking for
the return value. return NULL instead of ERR_PTR(-ENOMEM) to keep
consistent.

Signed-off-by: Miaoqian Lin 
Acked-by: Thierry Reding 
Link: https://lore.kernel.org/r/20211213020507.1458-1-linmq006@gmail.com
Signed-off-by: Vinod Koul

phy: tegra: xusb: mark PM functions as __maybe_unused

2021-07-22T09:11:07+00:00

When these are not referenced, gcc prints a harmless warning:

drivers/phy/tegra/xusb.c:1286:12: error: 'tegra_xusb_padctl_resume_noirq' defined but not used [-Werror=unused-function]
 1286 | static int tegra_xusb_padctl_resume_noirq(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/phy/tegra/xusb.c:1276:12: error: 'tegra_xusb_padctl_suspend_noirq' defined but not used [-Werror=unused-function]
 1276 | static int tegra_xusb_padctl_suspend_noirq(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: c545a9056712 ("phy: tegra: xusb: Add sleepwalk and suspend/resume")
Signed-off-by: Arnd Bergmann 
Link: https://lore.kernel.org/r/20210721152550.2976003-1-arnd@kernel.org
Signed-off-by: Vinod Koul

phy: tegra: xusb: Add wake/sleepwalk for Tegra186

2021-06-03T12:52:45+00:00

This commit implements Tegra186/Tegra194 XUSB PADCTL/AO wake and
sleepwalk operations.

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding

phy: tegra: xusb: Tegra210 host mode VBUS control

2021-06-03T12:52:45+00:00

To support XUSB host controller ELPG, this commit moves VBUS control
.phy_power_on()/.phy_power_off() to .phy_init()/.phy_exit().
When XUSB host controller enters ELPG, host driver invokes
.phy_power_off(), VBUS should remain ON so that USB devices will not
disconnect. VBUS can be turned OFF when host driver invokes
.phy_exit() which indicates disabling a USB port.

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding

phy: tegra: xusb: Add wake/sleepwalk for Tegra210

2021-06-03T12:52:40+00:00

This commit implements Tegra210 XUSB PADCTL wake and sleepwalk
routines. Sleepwalk logic is in PMC (always-on) hardware block.
PMC driver provides managed access to the sleepwalk registers
via regmap framework.

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding

phy: tegra: xusb: Add sleepwalk and suspend/resume

2021-06-03T12:49:34+00:00

This commit adds sleepwalk/wake and suspend/resume interfaces
to Tegra XUSB PHY driver.

Tegra XUSB host controller driver makes use of sleepwalk functions
to enable/disable sleepwalk circuit which is in always-on partition
and can respond to USB resume signals when controller is not powered.
Sleepwalk can be enabled/disabled for any USB UPHY individually.

  - tegra_xusb_padctl_enable_phy_sleepwalk()
  - tegra_xusb_padctl_disable_phy_sleepwalk()

Tegra XUSB host controller driver makes use of wake functions to
enable/disable/query wake circuit which is in always-on partition
can wake system up when USB resume happens.
Wake circuit can be enabled/disabled for any USB PHY individually.

  - tegra_xusb_padctl_enable_phy_wake()
  - tegra_xusb_padctl_disable_phy_wake()
  - tegra_xusb_padctl_remote_wake_detected()

This commit also adds two system suspend stubs that can be used to
save and restore XUSB PADCTL context during system suspend and
resume.
  - tegra_xusb_padctl_suspend_noirq()
  - tegra_xusb_padctl_resume_noirq()

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding

phy: tegra: xusb: Add Tegra210 lane_iddq operation

2021-06-03T12:49:33+00:00

As per Tegra210 TRM, before changing lane assignments, driver should
keep lanes in IDDQ and sleep state; after changing lane assignments,
driver should bring lanes out of IDDQ.
This commit implements the required operations.

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding

phy: tegra: xusb: Rearrange UPHY init on Tegra210

2021-06-03T12:49:33+00:00

This commit is a preparation for enabling XUSB SC7 support.
It rearranges Tegra210 XUSB PADCTL UPHY initialization sequence,
for the following reasons:

1. PLLE hardware power sequencer has to be enabled only after both
   PEX UPHY PLL and SATA UPHY PLL are initialized.
   tegra210_uphy_init() -> tegra210_pex_uphy_enable()
                        -> tegra210_sata_uphy_enable()
                        -> tegra210_plle_hw_sequence_start()
                        -> tegra210_aux_mux_lp0_clamp_disable()

2. At cold boot and SC7 exit, the following bits must be cleared after
   PEX/SATA lanes are out of IDDQ (IDDQ_DISABLE=1).
   a. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_CLAMP_EN,
   b. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_CLAMP_EN_EARLY
   c. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_VCORE_DOWN

   tegra210_pex_uphy_enable() and tegra210_sata_uphy_enable() are in
   charge of bringing lanes out of IDDQ, and then AUX_MUX_LP0_* bits
   will be cleared by tegra210_aux_mux_lp0_clamp_disable().

3. Once UPHY PLL hardware power sequencer is enabled, do not assert
   reset to PEX/SATA PLLs, otherwise UPHY PLL operation will be broken.

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding

phy: tegra: xusb: Move usb3 port init for Tegra210

2021-06-03T12:49:33+00:00

The programming sequence in tegra210_usb3_port_enable() is required
for both cold boot and SC7 exit, and must be performed only after
PEX/SATA UPHY is initialized. Therefore, this commit moves the
programming sequence to tegra210_usb3_phy_power_on(). PCIE/SATA phy
.power_on() stub will invoke tegra210_usb3_phy_power_on() if the lane
is assigned for XUSB super-speed.

Signed-off-by: JC Kuo 
Acked-By: Vinod Koul 
Signed-off-by: Thierry Reding