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ehci: msm: bring up iface + core clocks

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This seems to be necessary on my samsung-a5. Without this patch, the
first access of EHCI registers causes a bus stall and subsequent reset.

I am unsure why this wasn't already necessary for db410c, perhaps those
clocks are already enabled on boot.

Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Sam Day <me@samcday.com>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Sam Day
2024-05-06 10:26:58 +00:00
committed by Caleb Connolly
parent 4fb4bb08e7
commit 9b3a9f896e
1 changed files with 35 additions and 2 deletions
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37
drivers/usb/host/ehci-msm.c
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@@ -7,7 +7,9 @@
* Based on Linux driver
*/
#include <clk.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <errno.h>
#include <usb.h>
@@ -24,6 +26,8 @@ struct msm_ehci_priv {
struct usb_ehci *ehci; /* Start of IP core*/
struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
struct phy phy;
struct clk iface_clk;
struct clk core_clk;
};
static int msm_init_after_reset(struct ehci_ctrl *dev)
@@ -52,20 +56,46 @@ static int ehci_usb_probe(struct udevice *dev)
struct ehci_hcor *hcor;
int ret;
ret = clk_get_by_name(dev, "core", &p->core_clk);
if (ret) {
dev_err(dev, "Failed to get core clock: %d\n", ret);
return ret;
}
ret = clk_get_by_name(dev, "iface", &p->iface_clk);
if (ret) {
dev_err(dev, "Failed to get iface clock: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(&p->core_clk);
if (ret)
return ret;
ret = clk_prepare_enable(&p->iface_clk);
if (ret)
goto cleanup_core;
hccr = (struct ehci_hccr *)((phys_addr_t)&ehci->caplength);
hcor = (struct ehci_hcor *)((phys_addr_t)hccr +
HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
ret = generic_setup_phy(dev, &p->phy, 0);
if (ret)
return ret;
goto cleanup_iface;
ret = board_usb_init(0, plat->init_type);
if (ret < 0)
return ret;
goto cleanup_iface;
return ehci_register(dev, hccr, hcor, &msm_ehci_ops, 0,
plat->init_type);
cleanup_iface:
clk_disable_unprepare(&p->iface_clk);
cleanup_core:
clk_disable_unprepare(&p->core_clk);
return ret;
}
static int ehci_usb_remove(struct udevice *dev)
@@ -81,6 +111,9 @@ static int ehci_usb_remove(struct udevice *dev)
/* Stop controller. */
clrbits_le32(&ehci->usbcmd, CMD_RUN);
clk_disable_unprepare(&p->iface_clk);
clk_disable_unprepare(&p->core_clk);
ret = generic_shutdown_phy(&p->phy);
if (ret)
return ret;