linux-kernel - Re: [PATCH v3 2/3] davinci: vpss: dm365: set vpss clk ctrl

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Message-ID: <CA+V-a8vRndz7aEMfJjyUcSAwv6G5X2SZ+r_a9AzUbqzbLRDCYA@mail.gmail.com>
Date:	Thu, 29 Nov 2012 07:08:36 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sakari Ailus <sakari.ailus@....fi>
Cc:	LMML <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Manjunath Hadli <manjunath.hadli@...com>,
	Prabhakar Lad <prabhakar.lad@...com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH v3 2/3] davinci: vpss: dm365: set vpss clk ctrl

Hi Sakari,

Thanks for the quick review.

On Thu, Nov 29, 2012 at 1:48 AM, Sakari Ailus <sakari.ailus@....fi> wrote:
> Hi Prabhakar,
>
> On Wed, Nov 28, 2012 at 04:25:33PM +0530, Prabhakar Lad wrote:
>> From: Manjunath Hadli <manjunath.hadli@...com>
>>
>> request_mem_region for VPSS_CLK_CTRL register and ioremap.
>> and enable clocks appropriately.
>>
>> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
>> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>> ---
>>  drivers/media/platform/davinci/vpss.c |   14 ++++++++++++++
>>  1 files changed, 14 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/media/platform/davinci/vpss.c b/drivers/media/platform/davinci/vpss.c
>> index 34ad7bd..a36d694 100644
>> --- a/drivers/media/platform/davinci/vpss.c
>> +++ b/drivers/media/platform/davinci/vpss.c
>> @@ -103,6 +103,7 @@ struct vpss_hw_ops {
>>  struct vpss_oper_config {
>>       __iomem void *vpss_regs_base0;
>>       __iomem void *vpss_regs_base1;
>> +     resource_size_t *vpss_regs_base2;
>>       enum vpss_platform_type platform;
>>       spinlock_t vpss_lock;
>>       struct vpss_hw_ops hw_ops;
>> @@ -484,11 +485,24 @@ static struct platform_driver vpss_driver = {
>>
>>  static void vpss_exit(void)
>>  {
>> +     iounmap(oper_cfg.vpss_regs_base2);
>> +     release_mem_region(*oper_cfg.vpss_regs_base2, 4);
>
> release_mem_region(VPSS_CLK_CTRL, 4);?
>
Ok.

>>       platform_driver_unregister(&vpss_driver);
>>  }
>>
>> +#define VPSS_CLK_CTRL                        0x01c40044
>> +#define VPSS_CLK_CTRL_VENCCLKEN              BIT(3)
>> +#define VPSS_CLK_CTRL_DACCLKEN               BIT(4)
>> +
>>  static int __init vpss_init(void)
>>  {
>> +     if (request_mem_region(VPSS_CLK_CTRL, 4, "vpss_clock_control")) {
>
> if (!request_mem_region())
>         return -EBUSY;
>
Ok makes sense returning early on failure.

Regards,
--Prabhakar

> ...
>
>> +             oper_cfg.vpss_regs_base2 = ioremap(VPSS_CLK_CTRL, 4);
>> +             __raw_writel(VPSS_CLK_CTRL_VENCCLKEN |
>> +                          VPSS_CLK_CTRL_DACCLKEN, oper_cfg.vpss_regs_base2);
>> +     } else {
>> +             return -EBUSY;
>> +     }
>>       return platform_driver_register(&vpss_driver);
>>  }
>>  subsys_initcall(vpss_init);
>
> --
> Sakari Ailus
> e-mail: sakari.ailus@....fi     XMPP: sailus@...iisi.org.uk
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