On Tue, Jun 05, 2012 at 12:04:34PM +0300, Mieshkov, Volodymyr wrote:
> Its observed with some PHY, the 60Mhz clock gets
> cut too soon for OMAP EHCI, leaving OMAP-EHCI in a bad state.
>
> So on starting port suspend, make sure the 60Mhz clock to EHCI
> is kept alive using an internal clock, so that EHCi can cleanly
> transition its hw state machine on a port suspend.
>
> Its not proven if this is the issue hit on USB3333,
> but the symptoms look very similar.
>
> Signed-off-by: Anand Gadiyar <gadiyar@xxxxxx>
> Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
> Signed-off-by: Volodymyr Mieshkov <x0182794@xxxxxx>
>
> diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
> index 5c78f9e..cb0de0e 100644
> --- a/drivers/usb/host/ehci-omap.c
> +++ b/drivers/usb/host/ehci-omap.c
> @@ -43,6 +43,7 @@
> #include <linux/regulator/consumer.h>
> #include <linux/pm_runtime.h>
> #include <linux/gpio.h>
> +#include <linux/clk.h>
>
> /* EHCI Register Set */
> #define EHCI_INSNREG04 (0xA0)
> @@ -55,6 +56,15 @@
> #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
> #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
>
> +/* Errata i693 */
> +static struct clk *utmi_p1_fck;
> +static struct clk *utmi_p2_fck;
> +static struct clk *xclk60mhsp1_ck;
> +static struct clk *xclk60mhsp2_ck;
> +static struct clk *usbhost_p1_fck;
> +static struct clk *usbhost_p2_fck;
> +static struct clk *init_60m_fclk;
> +
> /*-------------------------------------------------------------------------*/
>
> static const struct hc_driver ehci_omap_hc_driver;
> @@ -70,6 +80,41 @@ static inline u32 ehci_read(void __iomem *base, u32 reg)
> return __raw_readl(base + reg);
> }
>
> +/* Erratum i693 workaround sequence */
> +static void omap_ehci_erratum_i693(struct ehci_hcd *ehci)
> +{
> + int ret = 0;
tabs got converted into spaces...
--
balbi
Attachment:
signature.asc
Description: Digital signature
