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

Alexander Stein
2015-07-20T07:18:26Z

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@systec-electronic.com

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