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SubjectRe: [PATCH] drm/bridge: dw-hdmi: Use automatic CTS generation mode when using non-AHB audio
Dne sreda, 12. junij 2019 ob 10:51:47 CEST je Neil Armstrong napisal(a):
> When using an I2S source using a different clock source (usually the I2S
> audio HW uses dedicated PLLs, different from the HDMI PHY PLL), fixed
> CTS values will cause some frequent audio drop-out and glitches as
> reported on Amlogic, Allwinner and Rockchip SoCs setups.
> Setting the CTS in automatic mode will let the HDMI controller generate
> automatically the CTS value to match the input audio clock.
> The DesignWare DW-HDMI User Guide explains:
> For Automatic CTS generation
> Write "0" on the bit field "CTS_manual", Register 0x3205: AUD_CTS3
> The DesignWare DW-HDMI Databook explains :
> If "CTS_manual" bit equals 0b this registers contains "audCTS[19:0]"
> generated by the Cycle time counter according to specified timing.
> Cc: Jernej Skrabec <>
> Cc: Maxime Ripard <>
> Cc: Jonas Karlman <>
> Cc: Heiko Stuebner <>
> Cc: Jerome Brunet <>
> Signed-off-by: Neil Armstrong <>

Tested-by: Jernej Skrabec <>
Reviewed-by: Jernej Skrabec <>

Best regards,

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