linux-kernel - Re: [PATCH v4 03/18] memory: mtk-smi: Use a general config

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Message-ID: <aa91ceb7-673b-7022-d718-f9f61d4b2f23@gmail.com>
Date:   Fri, 21 Dec 2018 18:47:39 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Tomasz Figa <tfiga@...gle.com>, Will Deacon <will.deacon@....com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, arnd@...db.de,
        yingjoe.chen@...iatek.com, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>,
        Arvind Yadav <arvind.yadav.cs@...il.com>
Subject: Re: [PATCH v4 03/18] memory: mtk-smi: Use a general config_port
 interface



On 08/12/2018 09:39, Yong Wu wrote:
> The config_port of mt2712 and mt8183 are the same. Use a general
> config_port interface instead.
> 
> In addition, in mt2712, larb8 and larb9 are the bdpsys larbs which
> are not the normal larb, their register space are different from the
> normal one. thus, we can not call the general config_port. In mt8183,
> IPU0/1 and CCU connect with smi-common directly, they also are not
> the normal larb. Hence, we add a "larb_special_mask" for these special
> larbs.
> 
> This is also a preparing patch for adding mt8183 SMI support.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  drivers/memory/mtk-smi.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 8f2d152..3b9ad0e 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -53,6 +53,7 @@ struct mtk_smi_larb_gen {
>  	bool need_larbid;
>  	int port_in_larb[MTK_LARB_NR_MAX + 1];
>  	void (*config_port)(struct device *);
> +	unsigned int larb_special_mask; /* The special larbs mask. */

I'm not really happy with the name larb_special_mask but I can't think of
anything else. The comment is not needed as it just rewords the name of the
variable.

Other then that (or even without changing anything):

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

>  };
>  
>  struct mtk_smi {
> @@ -176,17 +177,13 @@ void mtk_smi_larb_put(struct device *larbdev)
>  	return -ENODEV;
>  }
>  
> -static void mtk_smi_larb_config_port_mt2712(struct device *dev)
> +static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
>  {
>  	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
>  	u32 reg;
>  	int i;
>  
> -	/*
> -	 * larb 8/9 is the bdpsys larb, the iommu_en is enabled defaultly.
> -	 * Don't need to set it again.
> -	 */
> -	if (larb->larbid == 8 || larb->larbid == 9)
> +	if (BIT(larb->larbid) & larb->larb_gen->larb_special_mask)
>  		return;
>  
>  	for_each_set_bit(i, (unsigned long *)larb->mmu, 32) {
> @@ -261,7 +258,8 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
>  
>  static const struct mtk_smi_larb_gen mtk_smi_larb_mt2712 = {
>  	.need_larbid = true,
> -	.config_port = mtk_smi_larb_config_port_mt2712,
> +	.config_port       = mtk_smi_larb_config_port_gen2_general,
> +	.larb_special_mask = BIT(8) | BIT(9),          /* bdpsys */
>  };
>  
>  static const struct of_device_id mtk_smi_larb_of_ids[] = {
>