linux-kernel - Re: [PATCH v5 2/2] usb: dwc2: refactor common low-level hw code to platform.c

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Date:	Wed, 7 Oct 2015 02:37:13 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>
CC:	Robert Baldyga <r.baldyga@...sung.com>,
	John Youn <John.Youn@...opsys.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v5 2/2] usb: dwc2: refactor common low-level hw code to
 platform.c

On 10/6/2015 1:56 AM, Marek Szyprowski wrote:
> DWC2 module on some platforms needs three additional hardware
> resources: phy controller, clock and power supply. All of them must be
> enabled/activated to properly initialize and operate. This was initially
> handled in s3c-hsotg driver, which has been converted to 'gadget' part
> of dwc2 driver. Unfortunately, not all of this code got moved to common
> platform code, what resulted in accessing DWC2 registers without
> enabling low-level hardware resources. This fails for example on Exynos
> SoCs. This patch moves all the code for managing those resources to
> common platform.c file and provides convenient wrappers for controlling
> them.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
> Changelog:
> v5:
> - added separate patch removing init_mutex, which is no longer needed
> 
> v4:
> - fixed broken conditional compilation and adjusted comments in dwc2_hsotg
>   structure documentation
> 
> v3:
> - rebased onto latest 'testing/next' from Felipe Balbi (includes
>   s3c_hsotg -> dwc2 rename)
> 
> v2:
> - moved setting of ll_hw_enabled flag to enable/disable functions,
>   as suggested by John Youn
> - moved setting of phy width to dwc2_lowlevel_init function
> ---
>  drivers/usb/dwc2/core.h     |  24 +++--
>  drivers/usb/dwc2/gadget.c   | 186 ++++----------------------------------
>  drivers/usb/dwc2/platform.c | 216 ++++++++++++++++++++++++++++++++++++--------
>  3 files changed, 210 insertions(+), 216 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
> index 89091db..7e79976 100644
> --- a/drivers/usb/dwc2/core.h
> +++ b/drivers/usb/dwc2/core.h
> @@ -579,6 +579,15 @@ struct dwc2_hregs_backup {
>   *                      - USB_DR_MODE_PERIPHERAL
>   *                      - USB_DR_MODE_HOST
>   *                      - USB_DR_MODE_OTG
> + * @hcd_enabled		Host mode sub-driver initialization indicator.
> + * @gadget_enabled	Peripheral mode sub-driver initialization indicator.
> + * l@...w_enabled	Status of low-level hardware resources.

Typo here.


Otherwise for this series:

Acked-by: John Youn <johnyoun@...opsys.com>
Tested-by: John Youn <johnyoun@...opsys.com>

Tested on IP v3.20a host/gadget/DRD mode.

Regards,
John

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