Hello.
Gupta, Ajay Kumar wrote:
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(100);
+ u32 devconf2;
+
+ /*
+ * Start the on-chip PHY and its PLL.
+ */
+ devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
+
+ devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN |
+ CONF2_PHY_GPIOMODE);
BWT, what's thet GPIOMODE bit for?
If GPIO Mode is set to '1' then UART3 Tx/Rx would come on DP and
DM pins of USBPHY.
Hm, why GPIOMODE then I wonder... :-)
+ devconf2 |= CONF2_PHY_PLLON | CONF2_DATPOL;
So, AM35x always uses the reversed data polarity?
It's getting set to '1' so its always normal polarity.
Ah, I got it reversed: 1 means normal polarity indeed...
+static void otg_timer(unsigned long _musb)
+{
+ struct musb *musb = (void *)_musb;
+ void __iomem *mregs = musb->mregs;
+ u8 devctl;
+ unsigned long flags;
+
+ /*
+ * We poll because AM35x's won't expose several OTG-critical
+ * status change events (from the transceiver) otherwise.
+ */
+ devctl = musb_readb(mregs, MUSB_DEVCTL);
+ DBG(7, "Poll devctl %02x (%s)\n", devctl, otg_state_string(musb));
+
+ spin_lock_irqsave(&musb->lock, flags);
+ switch (musb->xceiv->state) {
[...]
+ case OTG_STATE_A_WAIT_VFALL:
So, are you sure there's no need to call mod_timer() here for RTL 1.8?
What issue did you see on earlier RTLs ?
I didn't test DaVinci much; I didn't even test DA8xx much in OTG mode. :-/
And in the DA8xx host mode VBUS error would never occur anyway (as the VBUS
comparator is overridden on the EVM board).
As such I didn't see issue
In my normal testing.
OK.
+ musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
+ musb_writel(musb->ctrl_base, CORE_INTR_SRC_SET_REG,
+ MUSB_INTR_VBUSERROR << USB_INTR_USB_SHIFT);
+ break;
+ case OTG_STATE_B_IDLE:
+ if (!is_peripheral_enabled(musb))
+ break;
Hm, davinci.c sets DevCtl.Session here and I'm also doing it in
da8xx.c --
can you comment why you don't do that too?
I remember this was causing some issue in OTG testing.
Do you remember which issue?
Although I suspect that this code might be related to the comment below:
"DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set".
+ devctl = musb_readb(mregs, MUSB_DEVCTL);
+ if (devctl & MUSB_DEVCTL_BDEVICE)
+ mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
+ else
+ musb->xceiv->state = OTG_STATE_A_IDLE;
+ break;
[...]
+ musb->a_wait_bcon = A_WAIT_BCON_TIMEOUT;
This field is set by musb_core.c, so I dropped this line from
da8xx.c...
This has also been dropped from omap2430.c by this commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f7f9d63eac12b345d6243d1d608b7944a05be921
Need to test again but I was facing a issue where OTG build image
Was either working in host only mode or device only. Role were
Not changing based on ID pin status.
Hm, is this related?
+int musb_platform_exit(struct musb *musb)
+{
+ struct clk *otg_fck = clk_get(musb->controller, "fck");
+
+ if (is_host_enabled(musb))
+ del_timer_sync(&otg_workaround);
+
+ /* Delay to avoid problems with module reload... */
Are you sure this is needed? For DA8xx, I'm not sure: at least in host
mode it just causes pointless delay for me (VBUS comparator is overridden
in host mode); I was unable to test the OTG mode properly -- for some reason
USB device didn't get recongnized and VBUS has probably stayed low.
Didn't have time to properly look into the OTG mode yet...
I need to check on this, I guess it's not required though I have tested
OTG also on AM3517EVM.
+ for (delay = 30; delay > 0; delay--) {
+ devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+ if (!(devctl & MUSB_DEVCTL_VBUS))
+ goto done;
+ if ((devctl & MUSB_DEVCTL_VBUS) != warn) {
+ warn = devctl & MUSB_DEVCTL_VBUS;
+ DBG(1, "VBUS %d\n",
+ warn >> MUSB_DEVCTL_VBUS_SHIFT);
+ }
+ msleep(1000);
+ }
+
+ /* In OTG mode, another host might be connected... */
+ DBG(1, "VBUS off timeout (devctl %02x)\n", devctl);
+ }
+ if (otg_fck) {
musb_platfrom_init() suggests that otg_fck can't be NULL. Also,
clk_get
returns error code, not NULL, so should use IS_ERR() here.
Correct, would clean it.
Also, you call clk_get() on this clock twice, in musb_platfrom_init() and
here, but clk_put() only once.
Thanks,
Ajay
WBR, Sergei
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