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Message-ID: <87io0a8nbd.fsf@ti.com>
Date: Fri, 25 Mar 2016 19:44:22 +0200
From: Felipe Balbi <balbi@...nel.org>
To: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc: Peter Griffin <peter.griffin@...aro.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
mathias.nyman@...el.com, gregkh@...uxfoundation.org,
lee.jones@...aro.org, linux-usb@...r.kernel.org,
maxime.coquelin@...com, patrice.chotard@...com,
stable@...r.kernel.org, yoshihiro.shimoda.uh@...esas.com,
felipe.balbi@...ux.intel.com
Subject: Re: [PATCH] usb: host: xhci-plat: Make enum xhci_plat_type start at a non zero value
Hi,
Gregory CLEMENT <gregory.clement@...e-electrons.com> writes:
>> Peter Griffin <peter.griffin@...aro.org> writes:
>>> Otherwise generic-xhci and xhci-platform which have no data get wrongly
>>> detected as XHCI_PLAT_TYPE_MARVELL_ARMADA by xhci_plat_type_is().
>>>
>>> This fixes a regression in v4.5 for STiH407 family SoC's which use the
>>> synopsis dwc3 IP, whereby the disable_clk error path gets taken due to
>>> wrongly being detected as XHCI_PLAT_TYPE_MARVELL_ARMADA and the hcd never
>>> gets added.
>>>
>>> I suspect this will also fix other dwc3 DT platforms such as Exynos,
>>> although I've only tested on STih410 SoC.
>>>
>>> Fixes: 4efb2f694114 ("usb: host: xhci-plat: add struct xhci_plat_priv")
>>> Cc: stable@...r.kernel.org
>>> Cc: gregory.clement@...e-electrons.com
>>> Cc: yoshihiro.shimoda.uh@...esas.com
>>> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
>>> ---
>>> drivers/usb/host/xhci-plat.h | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
>>> index 5a2e2e3..529c3c4 100644
>>> --- a/drivers/usb/host/xhci-plat.h
>>> +++ b/drivers/usb/host/xhci-plat.h
>>> @@ -14,7 +14,7 @@
>>> #include "xhci.h" /* for hcd_to_xhci() */
>>>
>>> enum xhci_plat_type {
>>> - XHCI_PLAT_TYPE_MARVELL_ARMADA,
>>> + XHCI_PLAT_TYPE_MARVELL_ARMADA = 1,
>>> XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
>>> XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
>>
>> aren't these platforms using device tree ? Why aren't these just
>> different compatible strings ?
>
> According to 4efb2f69411456d35051e9047c15157c9a5ba217 "usb: host:
> xhci-plat: add struct xhci_plat_priv" :
>
> This patch adds struct xhci_plat_priv to simplify the code to match
> platform specific variables. For now, this patch adds a member "type" in
> the structure
that's fine but the answer doesn't exactly match my question ;-)
My point is that this enum shouldn't be necessary at all. We have
compatible flags to make these checks instead. How about below ?
(untested, uncompiled, yada yada yada). Note that we DON'T need this
xhci_plat_type trickery, just need to be a little bit smarter about how
we use driver_data:
diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
index 1eefc988192d..1ea6c18b74f3 100644
--- a/drivers/usb/host/xhci-mvebu.c
+++ b/drivers/usb/host/xhci-mvebu.c
@@ -41,8 +41,9 @@ static void xhci_mvebu_mbus_config(void __iomem *base,
}
}
-int xhci_mvebu_mbus_init_quirk(struct platform_device *pdev)
+int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
{
+ struct platform_device *pdev = to_platform_device(hcd->self.controller);
struct resource *res;
void __iomem *base;
const struct mbus_dram_target_info *dram;
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 5c15e9bc5f7a..adb77c60a9ae 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -47,43 +47,56 @@ static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
xhci->quirks |= XHCI_PLAT;
}
+static void xhci_priv_plat_start(struct usb_hcd *hcd)
+{
+ struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
+
+ if (priv->plat_start)
+ priv->plat_start(hcd);
+}
+
+static int xhci_priv_init_quirk(struct usb_hcd *hcd)
+{
+ struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
+
+ if (!priv->init_quirk)
+ return 0;
+
+ return priv->init_quirk(hcd);
+}
+
/* called during probe() after chip reset completes */
static int xhci_plat_setup(struct usb_hcd *hcd)
{
int ret;
- if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
- xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3)) {
- ret = xhci_rcar_init_quirk(hcd);
- if (ret)
- return ret;
- }
+ ret = xhci_priv_init_quirk(hcd);
+ if (ret)
+ return ret;
return xhci_gen_setup(hcd, xhci_plat_quirks);
}
static int xhci_plat_start(struct usb_hcd *hcd)
{
- if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
- xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
- xhci_rcar_start(hcd);
-
+ xhci_priv_plat_start(hcd);
return xhci_run(hcd);
}
#ifdef CONFIG_OF
static const struct xhci_plat_priv xhci_plat_marvell_armada = {
- .type = XHCI_PLAT_TYPE_MARVELL_ARMADA,
+ .init_quirk = xhci_mvebu_mbus_init_quirk,
};
static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
- .type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
+ .init_quirk = xhci_rcar_init_quirk,
};
static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
- .type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
+ .init_quirk = xhci_rcar_init_quirk,
+ .plat_start = xhci_rcar_start,
};
static const struct of_device_id usb_xhci_of_match[] = {
diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
index 5a2e2e3936c4..c4d565980832 100644
--- a/drivers/usb/host/xhci-plat.h
+++ b/drivers/usb/host/xhci-plat.h
@@ -13,27 +13,13 @@
#include "xhci.h" /* for hcd_to_xhci() */
-enum xhci_plat_type {
- XHCI_PLAT_TYPE_MARVELL_ARMADA,
- XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
- XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
-};
-
struct xhci_plat_priv {
enum xhci_plat_type type;
const char *firmware_name;
+ void (*plat_start)(struct usb_hcd *);
+ int (*init_quirk)(struct usb_hcd *);
};
#define hcd_to_xhci_priv(h) ((struct xhci_plat_priv *)hcd_to_xhci(h)->priv)
-static inline bool xhci_plat_type_is(struct usb_hcd *hcd,
- enum xhci_plat_type type)
-{
- struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
-
- if (priv && priv->type == type)
- return true;
- else
- return false;
-}
#endif /* _XHCI_PLAT_H */
ps: there might be bugs there, but it's a holiday and I really shouldn't
be spending time on this right now ;-)
Anyway, have fun testing. Let me know if it doesn't work.
--
balbi
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