Hi, Xinlei:
On Thu, 2022-05-12 at 14:30 +0800, xinlei.lee@xxxxxxxxxxxx wrote:
> From: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
>
> To comply with the panel sequence, hold the mipi signal to LP00
> before the dcs cmds transmission,
> and pull the mipi signal high from LP00 to LP11 until the start of
> the dcs cmds transmission.
> The normal panel timing is :
> (1) pp1800 DC pull up
> (2) avdd & avee AC pull high
> (3) lcm_reset pull high -> pull low -> pull high
> (4) Pull MIPI signal high (LP11) -> initial code -> send video
> data(HS mode)
> The power-off sequence is reversed.
> If dsi is not in cmd mode, then dsi will pull the mipi signal high in
> the mtk_output_dsi_enable function.
> The delay in lane_ready func is the reaction time of dsi_rx after
> pulling up the mipi signal.
>
> Fixes: 2dd8075d2185 ("drm/mediatek: mtk_dsi: Use the drm_panel_bridge
> API")
>
> Cc: <stable@xxxxxxxxxxxxxxx> # 6.6.x: b255d51e3967: sched: Modify dsi
> funcs to atomic operations
> Cc: <stable@xxxxxxxxxxxxxxx> # 6.6.x: 72c69c977502: sched: Separate
> poweron/poweroff from enable/disable and define new funcs
> Cc: <stable@xxxxxxxxxxxxxxx> # 6.6.x
This patch looks good to me, but do you want to 'back' port this patch
to Linux version 6.6?
Regards,
CK
> Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
> Signed-off-by: Xinlei Lee <xinlei.lee@xxxxxxxxxxxx>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_dsi.c | 28 +++++++++++++++++++++-------
> 1 file changed, 21 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
> b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index d9a6b928dba8..25e84d9426bf 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -203,6 +203,7 @@ struct mtk_dsi {
> struct mtk_phy_timing phy_timing;
> int refcount;
> bool enabled;
> + bool lanes_ready;
> u32 irq_data;
> wait_queue_head_t irq_wait_queue;
> const struct mtk_dsi_driver_data *driver_data;
> @@ -661,18 +662,11 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
> mtk_dsi_reset_engine(dsi);
> mtk_dsi_phy_timconfig(dsi);
>
> - mtk_dsi_rxtx_control(dsi);
> - usleep_range(30, 100);
> - mtk_dsi_reset_dphy(dsi);
> mtk_dsi_ps_control_vact(dsi);
> mtk_dsi_set_vm_cmd(dsi);
> mtk_dsi_config_vdo_timing(dsi);
> mtk_dsi_set_interrupt_enable(dsi);
>
> - mtk_dsi_clk_ulp_mode_leave(dsi);
> - mtk_dsi_lane0_ulp_mode_leave(dsi);
> - mtk_dsi_clk_hs_mode(dsi, 0);
> -
> return 0;
> err_disable_engine_clk:
> clk_disable_unprepare(dsi->engine_clk);
> @@ -701,6 +695,23 @@ static void mtk_dsi_poweroff(struct mtk_dsi
> *dsi)
> clk_disable_unprepare(dsi->digital_clk);
>
> phy_power_off(dsi->phy);
> +
> + dsi->lanes_ready = false;
> +}
> +
> +static void mtk_dsi_lane_ready(struct mtk_dsi *dsi)
> +{
> + if (!dsi->lanes_ready) {
> + dsi->lanes_ready = true;
> + mtk_dsi_rxtx_control(dsi);
> + usleep_range(30, 100);
> + mtk_dsi_reset_dphy(dsi);
> + mtk_dsi_clk_ulp_mode_leave(dsi);
> + mtk_dsi_lane0_ulp_mode_leave(dsi);
> + mtk_dsi_clk_hs_mode(dsi, 0);
> + msleep(20);
> + /* The reaction time after pulling up the mipi signal
> for dsi_rx */
> + }
> }
>
> static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
> @@ -708,6 +719,7 @@ static void mtk_output_dsi_enable(struct mtk_dsi
> *dsi)
> if (dsi->enabled)
> return;
>
> + mtk_dsi_lane_ready(dsi);
> mtk_dsi_set_mode(dsi);
> mtk_dsi_clk_hs_mode(dsi, 1);
>
> @@ -1017,6 +1029,8 @@ static ssize_t mtk_dsi_host_transfer(struct
> mipi_dsi_host *host,
> if (MTK_DSI_HOST_IS_READ(msg->type))
> irq_flag |= LPRX_RD_RDY_INT_FLAG;
>
> + mtk_dsi_lane_ready(dsi);
> +
> ret = mtk_dsi_host_send_cmd(dsi, msg, irq_flag);
> if (ret)
> goto restore_dsi_mode;
