linux-kernel - Re: [PATCH 1/8] drm/mediatek: Use regmap for register access

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Date:   Fri, 20 Apr 2018 11:41:22 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        ulrich.hecht+renesas@...il.com, laurent.pinchart@...asonboard.com,
        ck.hu@...iatek.com, airlied@...ux.ie, robh+dt@...nel.org,
        mark.rutland@....com, mturquette@...libre.com,
        sboyd@...eaurora.org, lee.jones@...aro.org
Cc:     davem@...emloft.net, gregkh@...uxfoundation.org,
        mchehab@...nel.org, rdunlap@...radead.org,
        pi-cheng.chen@...aro.org, sean.wang@...iatek.com,
        linux-clk@...r.kernel.org, linux@...linux.org.uk,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <mbrugger@...e.com>
Subject: Re: [PATCH 1/8] drm/mediatek: Use regmap for register access

Hi Philipp,

On 11/23/2017 09:54 AM, Philipp Zabel wrote:
> Hi Matthias,
> 
> On Tue, 2017-11-14 at 22:41 +0100, Matthias Brugger wrote:
>> The mmsys memory space is shared between the drm and the
>> clk driver. Use regmap to access it.
>>
>> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>> ---
>>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  4 ++--
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 30 +++++++++++++++++-------------
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |  4 ++--
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 13 ++++---------
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.h  |  2 +-
>>  5 files changed, 26 insertions(+), 27 deletions(-)
> [...]
[...]
>>  	}
>>  
>>  	value = mtk_ddp_sel_in(cur, next, &addr);
>>  	if (value) {
>> -		reg = readl_relaxed(config_regs + addr) & ~value;
>> -		writel_relaxed(reg, config_regs + addr);
>> +		regmap_read(config_regs, addr, &reg);
>> +		reg &= ~value;
>> +		regmap_write(config_regs, addr, reg);
> 
> 		regmap_update_bits(config_regs, addr, value, 0);
> 
> Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
> 

Thanks for having a look on that.

I'll update the next version with regmap_update_bits and leave your Reviewed-by,
hope that's ok.

Regards,
Matthias