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Subject: Re: [PATCH 4/9] drm: meson: vpp: use proper macros instead of magic
 constants
To:     Kevin Hilman <khilman@baylibre.com>, 86zhm782g5.fsf@baylibre.com
Cc:     linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, Julien Masson <jmasson@baylibre.com>
References: <86zhm782g5.fsf@baylibre.com> <86tvcf82eu.fsf@baylibre.com>
 <7h36jyy3qn.fsf@baylibre.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <d4bb07f6-4b42-573b-abe2-5d54a8b99a92@baylibre.com>
Date:   Thu, 8 Aug 2019 16:09:50 +0200
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Sender: linux-kernel-owner@vger.kernel.org
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On 25/06/2019 01:15, Kevin Hilman wrote:
> Julien Masson <jmasson@baylibre.com> writes:
> 
>> This patch add new macros which are used to set the following
>> registers:
>> - VPP_OSD_SCALE_COEF_IDX
>> - VPP_DOLBY_CTRL
>> - VPP_OFIFO_SIZE
>> - VPP_HOLD_LINES
>> - VPP_SC_MISC
>> - VPP_VADJ_CTRL
>>
>> Signed-off-by: Julien Masson <jmasson@baylibre.com>
> 
> [...]
> 
>> @@ -97,20 +97,22 @@ void meson_vpp_init(struct meson_drm *priv)
>>  	else if (meson_vpu_is_compatible(priv, "amlogic,meson-gxm-vpu")) {
>>  		writel_bits_relaxed(0xff << 16, 0xff << 16,
>>  				    priv->io_base + _REG(VIU_MISC_CTRL1));
>> -		writel_relaxed(0x20000, priv->io_base + _REG(VPP_DOLBY_CTRL));
>> -		writel_relaxed(0x1020080,
>> +		writel_relaxed(VPP_PPS_DUMMY_DATA_MODE,
>> +			       priv->io_base + _REG(VPP_DOLBY_CTRL));
>> +		writel_relaxed(0x108080,
> 
> nit: still a magic constant here, and it's not obvious why it's
> different from the current one.

This is a magic constant, it's a color, but indeed it should not change.

0x1020080 is the 10bit variant of 0x108080, on purpose.

Neil

> 
> Kevin
>