On Wed, Oct 16, 2024 at 03:54:15PM +0800, Hermes Wu via B4 Relay wrote: > From: Hermes Wu <Hermes.wu@xxxxxxxxxx> > > HDCP KSV list readback can choose to use AUX FIFO or > general data register. > For some DisplayPort devices, the KSV list must be read > in 5 byte boundaries. > The original AUX read command does not support these devices. > > The AUX command operation control register "REG_AUX_CMD_REQ" uses b[3:0] > as AUX operacion control, and b[7:4] are status bits and read only. > To change KSV read operation uses "CMD_AUX_NATIVE_READ" from using > the data registers to using AUX FIFO. > The extended command "CMD_AUX_GET_KSV_LIST" is added as > "CMD_AUX_NATIVE_READ" with the 0x10 flag which selects AUX FIFO mode. > > Signed-off-by: Hermes Wu <Hermes.wu@xxxxxxxxxx> > --- > drivers/gpu/drm/bridge/ite-it6505.c | 16 +++++++++++----- > 1 file changed, 11 insertions(+), 5 deletions(-) > > @@ -996,7 +1001,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505, > size); > > /* Aux Fire */ > - it6505_write(it6505, REG_AUX_CMD_REQ, cmd); > + it6505_write(it6505, REG_AUX_CMD_REQ, FIELD_GET(M_AUX_REQ_CMD, cmd)); This needs #include <linux/bitfield.h> Other than that Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> > > ret = it6505_aux_wait(it6505); > if (ret < 0) -- With best wishes Dmitry
