linux-kernel - Re: [PATCH 4/9] drm: meson: vpp: use proper macros instead of magic constants

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Date:   Mon, 24 Jun 2019 16:15:28 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     86zhm782g5.fsf@...libre.com,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Julien Masson <jmasson@...libre.com>
Subject: Re: [PATCH 4/9] drm: meson: vpp: use proper macros instead of magic constants

Julien Masson <jmasson@...libre.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@...libre.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.

Kevin