On Wed, 15 Jan 2014 13:27:21 +0200 Jyri Sarha jsarha@ti.com wrote:
From driver/gpu/drm/i2c/tda998x_drv.c. The driver configures CTS_N register statically to a value that works only with 4 byte samples. According to my tests it is possible to support 3 and 2 byte samples too by changing the CTS_N register value, but I am not sure if the configuration can be changed on the fly. My data sheet of the nxp chip is very vague about the register definitions, but I suppose the register configures some clock divider on the chip. HDMI supports only upto 24bit audio and the data sheet states that any extraneous least significant bits are ignored.
In the tda998x driver, the CTS_N is automatic (AIP_CNTRL_0_ACR_MAN is not set).
Then, in my Cubox (Marvell A510 + tda19988), the 16, 24 and 32 bits formats are working well with I2S input at any rate.