linux-kernel - Re: [PATCH v10 1/5] drm/layerscape: Add Freescale DCU DRM driver

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Date:	Mon, 20 Jul 2015 17:58:10 +0800
From:	jianwei wang <jianwei.wang.chn@...il.com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Jianwei Wang <jianwei.wang@...escale.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	airlied@...ux.ie, daniel.vetter@...ll.ch, mark.yao@...k-chips.com,
	scottwood@...escale.com, thierry.reding@...il.com,
	Alison Wang <b18965@...escale.com>,
	Xiubo Li <lixiubo@...s.chinamobile.com>
Subject: Re: [PATCH v10 1/5] drm/layerscape: Add Freescale DCU DRM driver

Hi Alexander,

Thank you for your review.

On Mon, Jul 20, 2015 at 3:18 PM, Alexander Stein
<alexander.stein@...tec-electronic.com> wrote:
> On Friday 17 July 2015 18:38:59, Jianwei Wang wrote:
>> [...]
>> +static const struct regmap_config fsl_dcu_regmap_config = {
>> +     .reg_bits = 32,
>> +     .reg_stride = 4,
>> +     .val_bits = 32,
>> +};
>
> This defaults to REGCACHE_NONE which in the end sets regmap.cache_only = true.
>
>> [...]
>> +#ifdef CONFIG_PM_SLEEP
>> +static int fsl_dcu_drm_pm_suspend(struct device *dev)
>> +{
>> +     struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
>> +
>> +     if (!fsl_dev)
>> +             return 0;
>> +
>> +     drm_kms_helper_poll_disable(fsl_dev->drm);
>> +     regcache_cache_only(fsl_dev->regmap, true);
>
> This should raise a warning (see http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/base/regmap/regcache.c#n472) as map->cache_bypass is set because of REGCACHE_NONE.
> I think you set the cache_type to REGCACHE_FLAT, but neither _LZO or _RBTREE (see https://lkml.org/lkml/2015/7/16/552 for that)
>

okay

BR.
Jianwei


> Best regards,
> Alexander
> --
> Dipl.-Inf. Alexander Stein
> SYS TEC electronic GmbH
> alexander.stein@...tec-electronic.com
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