On 28/02/2023 02:26, Doug Anderson wrote:
Hi,
On Wed, Feb 1, 2023 at 1:51 AM Dave Stevenson
<dave.stevenson@xxxxxxxxxxxxxxx> wrote:
On Tue, 31 Jan 2023 at 22:22, Douglas Anderson <dianders@xxxxxxxxxxxx> wrote:
Set the "pre_enable_prev_first" as provided by commit 4fb912e5e190
("drm/bridge: Introduce pre_enable_prev_first to alter bridge init
order"). This should allow us to revert commit ec7981e6c614
("drm/msm/dsi: don't powerup at modeset time for parade-ps8640") and
commit 7d8e9a90509f ("drm/msm/dsi: move DSI host powerup to modeset
time").
I see no reference in the TC358762 datasheet to requiring the DSI
interface to be in any particular state.
However, setting this flag does mean that the DSI host doesn't need to
power up and down for each host_transfer request from
tc358762_pre_enable/tc358762_init, so on that basis I'm good with it.
Reviewed-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Cc: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Cc: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---
(no changes since v1)
drivers/gpu/drm/bridge/tc358762.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/bridge/tc358762.c b/drivers/gpu/drm/bridge/tc358762.c
index 0b6a28436885..77f7f7f54757 100644
--- a/drivers/gpu/drm/bridge/tc358762.c
+++ b/drivers/gpu/drm/bridge/tc358762.c
@@ -229,6 +229,7 @@ static int tc358762_probe(struct mipi_dsi_device *dsi)
ctx->bridge.funcs = &tc358762_bridge_funcs;
ctx->bridge.type = DRM_MODE_CONNECTOR_DPI;
ctx->bridge.of_node = dev->of_node;
+ ctx->bridge.pre_enable_prev_first = true;
drm_bridge_add(&ctx->bridge);
Abhinav asked what the plan was for landing this [1]. Since this isn't
urgent, I guess the plan is to land patch #1 in drm-misc-next. Then we
sit and wait until it percolates into mainline and, once it does, then
patch #2 and #3 can land.
Since I have Dave's review I can commit this to drm-misc-next myself.
My plan will be to wait until Thursday or Friday of this week (to give
people a bit of time to object) and then land patch #1. Then I'll
snooze things for a while and poke Abhinav and Dmitry to land patch #2
/ #3 when I notice it in mainline. If, at any point, someone comes out
of the woodwork and yells that this is breaking them then, worst case,
we can revert.
This plan sounds good to me.
[1] https://lore.kernel.org/r/1f204585-88e2-abae-1216-92f739ac9e91@xxxxxxxxxxx/
--
With best wishes
Dmitry
