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Date: Thu, 3 Nov 2022 15:12:32 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
Stefan Agner <stefan@...er.ch>,
Johan Hovold <johan@...nel.org>,
Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>
Subject: [PATCH 1/2] usb: dwc3: exynos: force PHY control from XHCI HCD
Force controlling of the generic USB PHYs also from XHCI HCD to let XHCI
driver call calibrate() method during the HCD reset. DWC3 also controls
USB PHYs, but it is not able to call the calibrate() method at the right
moment.
Fixes: 6000b8d900cd ("usb: dwc3: disable USB core PHY management")
Reported-by: Stefan Agner <stefan@...er.ch>
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
This fixes the issue reported here:
https://lore.kernel.org/all/808bdba846bb60456adf10a3016911ee@agner.ch/
Alternative for this change is a complete revert of the 6000b8d900cd
("usb: dwc3: disable USB core PHY management") commit.
Best regards
Marek Szyprowski, PhD
Samsung R&D Institute Poland
---
drivers/usb/dwc3/core.c | 2 ++
drivers/usb/dwc3/core.h | 1 +
drivers/usb/dwc3/dwc3-exynos.c | 65 +++++++++++++++++++++++-----------
drivers/usb/dwc3/host.c | 3 +-
4 files changed, 49 insertions(+), 22 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c0e7c76dc5c8..87d4472fc031 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1548,6 +1548,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
"snps,parkmode-disable-ss-quirk");
dwc->gfladj_refclk_lpm_sel = device_property_read_bool(dev,
"snps,gfladj-refclk-lpm-sel-quirk");
+ dwc->xhci_force_phy_control_quirk = device_property_read_bool(dev,
+ "snps,xhci_force_phy_control");
dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
"snps,tx_de_emphasis_quirk");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 8f9959ba9fd4..4d53edaf5999 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1318,6 +1318,7 @@ struct dwc3 {
unsigned resume_hs_terminations:1;
unsigned parkmode_disable_ss_quirk:1;
unsigned gfladj_refclk_lpm_sel:1;
+ unsigned xhci_force_phy_control_quirk:1;
unsigned tx_de_emphasis_quirk:1;
unsigned tx_de_emphasis:2;
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index 0ecf20eeceee..fbeefc9eb9c5 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -13,6 +13,7 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/consumer.h>
@@ -35,22 +36,20 @@ struct dwc3_exynos {
struct regulator *vdd33;
struct regulator *vdd10;
+ struct platform_device *dwc3;
};
-static int dwc3_exynos_remove_child(struct device *dev, void *unused)
-{
- struct platform_device *pdev = to_platform_device(dev);
-
- platform_device_unregister(pdev);
-
- return 0;
-}
+static const struct property_entry dwc3_exynos_properties[] = {
+ PROPERTY_ENTRY_BOOL("snps,xhci_force_phy_control"),
+ {}
+};
static int dwc3_exynos_probe(struct platform_device *pdev)
{
struct dwc3_exynos *exynos;
struct device *dev = &pdev->dev;
- struct device_node *node = dev->of_node;
+ struct device_node *node = dev->of_node, *child;
+ struct platform_device *dwc3;
const struct dwc3_exynos_driverdata *driver_data;
int i, ret;
@@ -109,21 +108,44 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
goto vdd10_err;
}
- if (node) {
- ret = of_platform_populate(node, NULL, NULL, dev);
- if (ret) {
- dev_err(dev, "failed to add dwc3 core\n");
- goto populate_err;
- }
- } else {
- dev_err(dev, "no device node, failed to add dwc3 core\n");
- ret = -ENODEV;
- goto populate_err;
+ child = of_get_next_child(node, NULL);
+ if (!child) {
+ dev_err(dev, "Failed to find DWC3 core device node\n");
+ goto dwc3_child_err;
+ }
+
+ dwc3 = of_device_alloc(child, NULL, dev);
+ if (!dwc3) {
+ dev_err(dev, "Failed to allocate DWC3 core device\n");
+ goto dwc3_alloc_err;
+ }
+
+ dwc3->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+ dwc3->dev.dma_mask = &dwc3->dev.coherent_dma_mask;
+ dwc3->dev.bus = &platform_bus_type;
+
+ ret = device_create_managed_software_node(&dwc3->dev,
+ dwc3_exynos_properties, NULL);
+ if (ret < 0) {
+ dev_err(dev, "Failed to add properties to DWC3 device\n");
+ goto dwc3_props_err;
+ }
+
+ ret = of_device_add(dwc3);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register DWC3 core device\n");
+ goto dwc3_props_err;
}
+ exynos->dwc3 = dwc3;
+ of_node_put(child);
return 0;
-populate_err:
+dwc3_props_err:
+ platform_device_put(dwc3);
+dwc3_alloc_err:
+ of_node_put(child);
+dwc3_child_err:
regulator_disable(exynos->vdd10);
vdd10_err:
regulator_disable(exynos->vdd33);
@@ -142,7 +164,8 @@ static int dwc3_exynos_remove(struct platform_device *pdev)
struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
int i;
- device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
+ device_remove_software_node(&exynos->dwc3->dev);
+ of_device_unregister(exynos->dwc3);
for (i = exynos->num_clks - 1; i >= 0; i--)
clk_disable_unprepare(exynos->clks[i]);
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index a7154fe8206d..84f25f392dbd 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -97,7 +97,8 @@ int dwc3_host_init(struct dwc3 *dwc)
goto err;
}
- ret = platform_device_add_data(xhci, &dwc3_xhci_plat_priv,
+ if (!dwc->xhci_force_phy_control_quirk)
+ ret = platform_device_add_data(xhci, &dwc3_xhci_plat_priv,
sizeof(dwc3_xhci_plat_priv));
if (ret)
goto err;
--
2.17.1
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