From mboxrd@z Thu Jan  1 00:00:00 1970
From: alexander.stein@systec-electronic.com (Alexander Stein)
Date: Mon, 20 Jul 2015 09:18:16 +0200
Subject: [PATCH v10 1/5] drm/layerscape: Add Freescale DCU DRM driver
In-Reply-To: <1437129543-8037-1-git-send-email-jianwei.wang@freescale.com>
References: <1437129543-8037-1-git-send-email-jianwei.wang@freescale.com>
Message-ID: <2160582.6fH0nmeH2v@ws-stein>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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 at systec-electronic.com

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