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Subject: Re: [PATCH 2/8] drm/meson: add HDMI div40 TMDS mode
To:     Andrzej Hajda <a.hajda@samsung.com>,
        Laurent.pinchart@ideasonboard.com
Cc:     linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org
References: <20190115123315.11069-1-narmstrong@baylibre.com>
 <CGME20190115123329epcas2p238b0b8a9f449f96991e02b34c54741ca@epcas2p2.samsung.com>
 <20190115123315.11069-3-narmstrong@baylibre.com>
 <5103b2e8-2f73-da18-a043-fa45d6e2c139@samsung.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <bdd3ec10-1f9f-324c-aed0-6eab30fe518b@baylibre.com>
Date:   Fri, 18 Jan 2019 10:40:17 +0100
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In-Reply-To: <5103b2e8-2f73-da18-a043-fa45d6e2c139@samsung.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Andrzej,

On 18/01/2019 10:13, Andrzej Hajda wrote:
> On 15.01.2019 13:33, Neil Armstrong wrote:
>> Add support for TMDS Clock > 3.4GHz for HDMI2.0 display modes.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>>  drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++++++++++++++++++----
>>  1 file changed, 19 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> index 807111ebfdd9..3d8decb77019 100644
>> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> @@ -365,7 +365,8 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
>>  	unsigned int wr_clk =
>>  		readl_relaxed(priv->io_base + _REG(VPU_HDMI_SETTING));
>>  
>> -	DRM_DEBUG_DRIVER("%d:\"%s\"\n", mode->base.id, mode->name);
>> +	DRM_DEBUG_DRIVER("%d:\"%s\" div%d\n", mode->base.id, mode->name,
>> +			 mode->clock > 340000 ? 40 : 10);
>>  
>>  	/* Enable clocks */
>>  	regmap_update_bits(priv->hhi, HHI_HDMI_CLK_CNTL, 0xffff, 0x100);
>> @@ -385,9 +386,17 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
>>  	/* Enable normal output to PHY */
>>  	dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_BIST_CNTL, BIT(12));
>>  
>> -	/* TMDS pattern setup (TOFIX pattern for 4k2k scrambling) */
>> -	dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01, 0x001f001f);
>> -	dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_23, 0x001f001f);
>> +	/* TMDS pattern setup (TOFIX Handle the YUV420 case) */
>> +	if (mode->clock > 340000) {
>> +		dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01, 0);
>> +		dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_23,
>> +				  0x03ff03ff);
>> +	} else {
>> +		dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01,
>> +				  0x001f001f);
>> +		dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_23,
>> +				  0x001f001f);
>> +	}
> 
> 
>     val = mode->clock > 340000 ? 0x03ff03ff : 0x001f001f;
>     dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01, val);
> 
>     dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_23, val);
> 
> 
> The best would be to replace these magic values with descriptive macros.

In fact, these are patterns, not sure how to describe them ? it's like a plain number, the value has it's own meaning.


Neil
> 
> 
> Regards
> 
> Andrzej
> 
> 
>>  
>>  	/* Load TMDS pattern */
>>  	dw_hdmi_top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_CNTL, 0x1);
>> @@ -413,6 +422,8 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
>>  	/* Disable clock, fifo, fifo_wr */
>>  	regmap_update_bits(priv->hhi, HHI_HDMI_PHY_CNTL1, 0xf, 0);
>>  
>> +	dw_hdmi_set_high_tmds_clock_ratio(hdmi);
>> +
>>  	msleep(100);
>>  
>>  	/* Reset PHY 3 times in a row */
>> @@ -562,6 +573,10 @@ dw_hdmi_mode_valid(struct drm_connector *connector,
>>  		mode->vdisplay, mode->vsync_start,
>>  		mode->vsync_end, mode->vtotal, mode->type, mode->flags);
>>  
>> +	/* If sink max TMDS clock, we reject the mode */
>> +	if (mode->clock > connector->display_info.max_tmds_clock)
>> +		return MODE_BAD;
>> +
>>  	/* Check against non-VIC supported modes */
>>  	if (!vic) {
>>  		status = meson_venc_hdmi_supported_mode(mode);
> 
> 
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