This will allow us to only allocate memory when
we actually need.
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
drivers/usb/dwc3/core.c | 21 +++++++++++----------
drivers/usb/dwc3/core.h | 8 ++++++--
drivers/usb/dwc3/gadget.c | 2 +-
3 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index ca3b01f..1f67606 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -154,7 +154,7 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc)
struct dwc3_event_buffer *evt;
int i;
- for (i = 0; i < DWC3_EVENT_BUFFERS_NUM; i++) {
+ for (i = 0; i < dwc->num_event_buffers; i++) {
evt = dwc->ev_buffs[i];
if (evt) {
dwc3_free_one_event_buffer(dwc, evt);
@@ -166,17 +166,19 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc)
/**
* dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
* @dwc: Pointer to out controller context structure
- * @num: number of event buffers to allocate
* @length: size of event buffer
*
* Returns 0 on success otherwise negative errno. In error the case, dwc
* may contain some buffers allocated but not all which were requested.
*/
-static int __devinit dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned num,
- unsigned length)
+static int __devinit dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
{
+ int num;
int i;
+ num = DWC3_NUM_INT(dwc->hwparams.hwparams1);
+ dwc->num_event_buffers = num;
+
for (i = 0; i < num; i++) {
struct dwc3_event_buffer *evt;
@@ -202,7 +204,7 @@ static int __devinit dwc3_event_buffers_setup(struct dwc3 *dwc)
struct dwc3_event_buffer *evt;
int n;
- for (n = 0; n < DWC3_EVENT_BUFFERS_NUM; n++) {
+ for (n = 0; n < dwc->num_event_buffers; n++) {
evt = dwc->ev_buffs[n];
dev_dbg(dwc->dev, "Event buf %p dma %08llx length %d\n",
evt->buf, (unsigned long long) evt->dma,
@@ -225,7 +227,7 @@ static void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
struct dwc3_event_buffer *evt;
int n;
- for (n = 0; n < DWC3_EVENT_BUFFERS_NUM; n++) {
+ for (n = 0; n < dwc->num_event_buffers; n++) {
evt = dwc->ev_buffs[n];
dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n), 0);
dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n), 0);
@@ -289,8 +291,9 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
cpu_relax();
} while (true);
- ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_NUM,
- DWC3_EVENT_BUFFERS_SIZE);
+ dwc3_cache_hwparams(dwc);
+
+ ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
if (ret) {
dev_err(dwc->dev, "failed to allocate event buffers\n");
ret = -ENOMEM;
@@ -303,8 +306,6 @@ static int __devinit dwc3_core_init(struct dwc3 *dwc)
goto err1;
}
- dwc3_cache_hwparams(dwc);
-
return 0;
err1:
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index b7d56c3..4b6c673 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -52,7 +52,7 @@
/* Global constants */
#define DWC3_ENDPOINTS_NUM 32
-#define DWC3_EVENT_BUFFERS_NUM 2
+#define DWC3_EVENT_BUFFERS_MAX 2
#define DWC3_EVENT_BUFFERS_SIZE PAGE_SIZE
#define DWC3_EVENT_TYPE_MASK 0xfe
@@ -536,6 +536,8 @@ struct dwc3_hwparams {
u32 hwparams8;
};
+#define DWC3_NUM_INT(n) (((n) & (0x3f << 15)) >> 15)
+
/**
* struct dwc3 - representation of our controller
* @ctrl_req: usb control request which is used for ep0
@@ -555,6 +557,7 @@ struct dwc3_hwparams {
* @regs: base address for our registers
* @regs_size: address space size
* @irq: IRQ number
+ * @num_event_buffers: calculated number of event buffers
* @maximum_speed: maximum speed requested (mainly for testing purposes)
* @revision: revision register contents
* @is_selfpowered: true when we are selfpowered
@@ -585,7 +588,7 @@ struct dwc3 {
spinlock_t lock;
struct device *dev;
- struct dwc3_event_buffer *ev_buffs[DWC3_EVENT_BUFFERS_NUM];
+ struct dwc3_event_buffer *ev_buffs[DWC3_EVENT_BUFFERS_MAX];
struct dwc3_ep *eps[DWC3_ENDPOINTS_NUM];
struct usb_gadget gadget;
@@ -596,6 +599,7 @@ struct dwc3 {
int irq;
+ u32 num_event_buffers;
u32 maximum_speed;
u32 revision;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 807737a..b84418e 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1925,7 +1925,7 @@ static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
spin_lock(&dwc->lock);
- for (i = 0; i < DWC3_EVENT_BUFFERS_NUM; i++) {
+ for (i = 0; i < dwc->num_event_buffers; i++) {
irqreturn_t status;
status = dwc3_process_event_buf(dwc, i);
--
1.7.8.rc3
--
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