[PATCH v7 42/43] drm/mediatek: mtk_hdmi_v2: Add debugfs ops and implement ABIST

[CK Hu (胡俊光)]

On Mon, 2025-02-17 at 16:48 +0100, AngeloGioacchino Del Regno wrote:
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> 
> Implement the Automated Built-In Self-Test ABIST functionality
> provided by the HDMIv2 IP and expose it through the "hdmi_abist"
> debugfs file.
> 
> Write "1" to this file to activate ABIST, or "0" to deactivate.
> 
> The ABIST functionality can be used to validate that the HDMI
> Transmitter itself works and that can output a valid image to
> the HDMI Display that is connected.
> 
> This is especially useful when trying to rule out any possible
> issue that is related to the display pipeline, as the HDMI Tx
> is always the last component; this means that HDMI ABIST can be
> used even without prior display controller pipeline configuration.
> 
> The expected output is a 100% color bar (rainbow) test pattern.

Reviewed-by: CK Hu <ck.hu at mediatek.com>

> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> ---
> 

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