107 lines
3.6 KiB
Diff
107 lines
3.6 KiB
Diff
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From 2e0a70b0406b93771127a35c80f7c07e1c2b091f Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megi@xff.cz>
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Date: Wed, 27 Apr 2022 07:06:10 +0200
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Subject: [PATCH 112/389] usb: musb: sunxi: Avoid enabling host side code on
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SoCs where it's not used
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For some sunxi SoCs host side code is active but unused, because
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phy re-routes USB handling to a regular EHCI/OHCI driver.
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When host side code of musb is left initialized it sometimes
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interferes with suspend to RAM. Disabling the host side code
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on SoCs that re-route host mode to a regular *HCI hardware
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block fixes the issue.
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Issue: https://gitlab.com/postmarketOS/pmaports/-/issues/1478
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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drivers/usb/musb/musb_core.c | 10 ++++++++++
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drivers/usb/musb/sunxi.c | 29 ++++++++++++++++++++++-------
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2 files changed, 32 insertions(+), 7 deletions(-)
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diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
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index 03027c6fa3ab..57199cbb3950 100644
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--- a/drivers/usb/musb/musb_core.c
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+++ b/drivers/usb/musb/musb_core.c
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@@ -979,6 +979,16 @@ static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl)
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case OTG_STATE_B_IDLE:
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musb_g_disconnect(musb);
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break;
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+ case OTG_STATE_A_WAIT_VRISE:
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+ /*
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+ * For sunxi use case, where host side of the musb driver
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+ * is not used for host mode, we want to ignore
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+ * OTG_STATE_A_WAIT_VRISE state set in sunxi glue code
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+ * when transitioning to host mode on disconnect, in
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+ * order to not confuse the dmesg reader about possible
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+ * issues.
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+ */
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+ break;
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default:
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WARNING("unhandled DISCONNECT transition (%s)\n",
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usb_otg_state_string(musb->xceiv->otg->state));
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diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
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index 7f9a999cd5ff..fcd3159a92af 100644
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--- a/drivers/usb/musb/sunxi.c
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+++ b/drivers/usb/musb/sunxi.c
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@@ -345,12 +345,6 @@ static int sunxi_musb_set_mode(struct musb *musb, u8 mode)
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if (glue->phy_mode == new_mode)
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return 0;
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- if (musb->port_mode != MUSB_OTG) {
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- dev_err(musb->controller->parent,
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- "Error changing modes is only supported in dual role mode\n");
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- return -EINVAL;
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- }
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-
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if (musb->port1_status & USB_PORT_STAT_ENABLE)
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musb_root_disconnect(musb);
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@@ -670,13 +664,21 @@ static struct musb_hdrc_config sunxi_musb_hdrc_config_h3 = {
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.ram_bits = SUNXI_MUSB_RAM_BITS,
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};
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+static const char * const sunxi_musb_host_rerouted_phys[] = {
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+ "allwinner,sun8i-h3-usb-phy",
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+ "allwinner,sun8i-r40-usb-phy",
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+ "allwinner,sun8i-v3s-usb-phy",
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+ "allwinner,sun50i-a64-usb-phy",
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+ "allwinner,sun50i-h6-usb-phy",
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+ NULL,
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+};
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static int sunxi_musb_probe(struct platform_device *pdev)
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{
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struct musb_hdrc_platform_data pdata;
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struct platform_device_info pinfo;
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struct sunxi_glue *glue;
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- struct device_node *np = pdev->dev.of_node;
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+ struct device_node *np = pdev->dev.of_node, *phy_np;
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int ret;
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if (!np) {
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@@ -758,6 +760,19 @@ static int sunxi_musb_probe(struct platform_device *pdev)
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return dev_err_probe(&pdev->dev, PTR_ERR(glue->phy),
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"Error getting phy\n");
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+ /*
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+ * Host mode is handled outside of the musb driver on some allwinner
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+ * SoCs. We don't need musb host side code to be enabled at all.
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+ * In fact it causes occasional issues with suspend to ram, when
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+ * the host side code is enabled and unused (due to phy being re-routed
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+ * to a different *HCI controller).
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+ */
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+ phy_np = glue->phy->dev.of_node;
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+ if (of_device_compatible_match(phy_np, sunxi_musb_host_rerouted_phys)) {
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+ dev_info(&pdev->dev, "Disabling musb host side code due to re-routed phy\n");
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+ pdata.mode = MUSB_PERIPHERAL;
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+ }
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+
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glue->usb_phy = usb_phy_generic_register();
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if (IS_ERR(glue->usb_phy)) {
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dev_err(&pdev->dev, "Error registering usb-phy %ld\n",
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--
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2.35.3
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