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

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Date:	Mon, 20 Jul 2015 09:18:16 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Jianwei Wang <jianwei.wang@...escale.com>
Cc:	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,
	Jianwei Wang <jianwei.wang.chn@...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

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)

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

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