Hi, On Mon, Jun 24, 2024 at 7:20 AM Zhaoxiong Lv <lvzhaoxiong@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Currently, the init_code of the jd9365da driver is placed > in the enable() function and sent, but this seems to take > a long time. It takes 17ms to send each instruction (an init > code consists of about 200 instructions), so it takes > about 3.5s to send the init_code. So we moved the sending > of the inti_code to the prepare() function, and each > instruction seemed to take only 25μs. > > We checked the DSI host and found that the difference in > command sending time is caused by the different modes of > the DSI host in prepare() and enable() functions. > Our DSI Host only supports sending cmd in LP mode, The > prepare() function can directly send init_code (LP->cmd) > in LP mode, but the enable() function is in HS mode and > needs to switch to LP mode before sending init code > (HS->LP->cmd->HS). Therefore, it takes longer to send > the command. > > Signed-off-by: Zhaoxiong Lv <lvzhaoxiong@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> > --- > Changes between V5 and V4: > - 1. No changes. > > V4:https://lore.kernel.org/all/20240620080509.18504-2-lvzhaoxiong@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ > > Changes between V4 and V3: > - 1. Only move mipi_dsi_dcs_write_buffer from enable() function to prepare() function, > - and no longer use mipi_dsi_dcs_write_seq_multi. > > V3:https://lore.kernel.org/all/20240614145510.22965-2-lvzhaoxiong@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ > > --- > .../gpu/drm/panel/panel-jadard-jd9365da-h3.c | 24 +++++++++---------- > 1 file changed, 11 insertions(+), 13 deletions(-) As mentioned in v4, it would be good if someone with more MIPI history confirmed that this looks like a reasonable thing to do. However, the code looks fine so I'll give: Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
