linux-kernel - Re: [PATCH] drm/meson: fix G12A HDMI PLL settings for 4K60 1000/1001 variations

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Message-ID: <abf63289-dd97-75d7-d3ae-e41e171d59cc@baylibre.com>
Date:   Fri, 7 Jun 2019 10:09:32 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Kevin Hilman <khilman@...libre.com>,
        dri-devel@...ts.freedesktop.org
Cc:     linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/meson: fix G12A HDMI PLL settings for 4K60 1000/1001
 variations

On 06/06/2019 18:30, Kevin Hilman wrote:
> Neil Armstrong <narmstrong@...libre.com> writes:
> 
>> The Amlogic G12A HDMI PLL needs some specific settings to lock with
>> different fractional values for the 5,4GHz mode.
>>
>> Handle the 1000/1001 variation fractional case here to avoid having
>> the PLL in an non lockable state.
>>
>> Fixes: 202b9808f8ed ("drm/meson: Add G12A Video Clock setup")
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/meson/meson_vclk.c | 13 +++++++++++--
>>  1 file changed, 11 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_vclk.c b/drivers/gpu/drm/meson/meson_vclk.c
>> index 44250eff8a3f..83fc2fc82001 100644
>> --- a/drivers/gpu/drm/meson/meson_vclk.c
>> +++ b/drivers/gpu/drm/meson/meson_vclk.c
>> @@ -553,8 +553,17 @@ void meson_hdmi_pll_set_params(struct meson_drm *priv, unsigned int m,
>>  
>>  		/* G12A HDMI PLL Needs specific parameters for 5.4GHz */
>>  		if (m >= 0xf7) {
>> -			regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL4, 0xea68dc00);
>> -			regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL5, 0x65771290);
>> +			if (frac < 0x10000) {
>> +				regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL4,
>> +							0x6a685c00);
>> +				regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL5,
>> +							0x11551293);
>> +			} else {
>> +				regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL4,
>> +							0xea68dc00);
>> +				regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL5,
>> +							0x65771290);
>> +			}
>>  			regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL6, 0x39272000);
>>  			regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL7, 0x55540000);
>>  		} else {
> 
> Reviewed-by: Kevin Hilman <khilman@...libre.com>

Applied to drm-misc-fixes

> 
> nit: this is continuing with more magic constants, and it would be nice
> to have them converted to #define'd bitfields.  But since that isn't a
> new problem in this patch, it's fine to cleanup later.

Yep, it's on our to priority.

Neil


> 
> Kevin
>