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[v2,0/2] TI AM64/J7: USB Errata i2409 workaround

Message ID 20240516042845.31211-1-r-gunasekaran@ti.com
Headers show
Series TI AM64/J7: USB Errata i2409 workaround | expand

Message

Ravi Gunasekaran May 16, 2024, 4:28 a.m. UTC 
This series adds workaround for all TI platforms using
cdns3,usb IP. i.e. AM64/J7x

Change log:
----------
Changes since v1:
----------------
* Grouped the susp_ctrl register update along with
  existing CDNS3 snippet as suggested by Peter Chen

v1: https://lore.kernel.org/all/20240514092421.20897-1-r-gunasekaran@ti.com/#t

Roger Quadros (2):
  usb: cdns3: Add quirk flag to enable suspend residency
  usb: cdns3-ti: Add workaround for Errata i2409

 drivers/usb/cdns3/cdns3-ti.c | 15 ++++++++++++++-
 drivers/usb/cdns3/core.h     |  1 +
 drivers/usb/cdns3/drd.c      | 11 ++++++++++-
 drivers/usb/cdns3/drd.h      |  3 +++
 4 files changed, 28 insertions(+), 2 deletions(-)

Comments

Ravi Gunasekaran May 16, 2024, 4:35 a.m. UTC | #1 
On 5/16/24 9:58 AM, Ravi Gunasekaran wrote:
> From: Roger Quadros <rogerq@kernel.org>
> 
> Some platforms (e.g. ti,j721e-usb, ti,am64-usb) require
> this bit to be set to workaround a lockup issue with PHY
> short suspend intervals [1]. Add a platform quirk flag
> to indicate if Suspend Residency should be enabled.
> 
> [1] - https://www.ti.com/lit/er/sprz457h/sprz457h.pdf
> i2409 - USB: USB2 PHY locks up due to short suspend
> 
> Signed-off-by: Roger Quadros <rogerq@kernel.org>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
> ---
> Change log:
> ----------
> 
> Changes since v1:
> ----------------
> * Grouped the susp_ctrl register update along with
>   existing CDNS3 snippet as suggested by Peter Chen
> 
> v1: https://lore.kernel.org/all/20240514092421.20897-1-r-gunasekaran@ti.com/#t

[...]

> -	u32 state;
> +	u32 state, reg;
>  	int ret;
>  
>  	regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);
> @@ -433,12 +433,21 @@ int cdns_drd_init(struct cdns *cdns)
>  			cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
>  					      &cdns->otg_v1_regs->ien;
>  			writel(1, &cdns->otg_v1_regs->simulate);
> +
> +			if (cdns->pdata &&
> +			    (cdns->pdata->quirks & CDNS3_DRD_SUSPEND_RESIDENCY_ENABLE)) {
> +				reg = readl(&cdns->otg_v1_regs->susp_ctrl);
> +				reg |= SUSP_CTRL_SUSPEND_RESIDENCY_ENABLE;
> +				writel(reg, &cdns->otg_v1_regs->susp_ctrl);
> +			}
> +
>  			cdns->version  = CDNS3_CONTROLLER_V1;
>  		} else {
>  			dev_err(cdns->dev, "not supported DID=0x%08x\n", state);
>  			return -EINVAL;
>  		}
>  
> +

Please ignore this patch. I didn't notice this.
I will send a v3 fixing it.


>  		dev_dbg(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",
>  			 readl(&cdns->otg_v1_regs->did),
>  			 readl(&cdns->otg_v1_regs->rid));
> diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
> index d72370c321d3..1e2aee14d629 100644
> --- a/drivers/usb/cdns3/drd.h
> +++ b/drivers/usb/cdns3/drd.h
> @@ -193,6 +193,9 @@ struct cdns_otg_irq_regs {
>  /* OTGREFCLK - bitmasks */
>  #define OTGREFCLK_STB_CLK_SWITCH_EN	BIT(31)
>  
> +/* SUPS_CTRL - bitmasks */
> +#define SUSP_CTRL_SUSPEND_RESIDENCY_ENABLE	BIT(17)
> +
>  /* OVERRIDE - bitmasks */
>  #define OVERRIDE_IDPULLUP		BIT(0)
>  /* Only for CDNS3_CONTROLLER_V0 version */