[lkml]   [2020]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v2 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading
Hi Stephen.

On Thu, Oct 29, 2020 at 06:17:34PM -0700, Stephen Boyd wrote:
> This patch series cleans up the DDC code a little bit so that
> it is more efficient time wise and supports grabbing the EDID
> of the eDP panel over the aux channel. I timed this on a board
> I have on my desk and it takes about 20ms to grab the EDID out
> of the panel and make sure it is valid.
> The first two patches seem less controversial so I stuck them at
> the beginning. The third patch does the EDID reading and caches
> it so we don't have to keep grabbing it over and over again. And
> finally the last patch updates the reply field so that short
> reads and nacks over the channel are reflected properly instead of
> treating them as some sort of error that can't be discerned.
> Stephen Boyd (4):
> drm/bridge: ti-sn65dsi86: Combine register accesses in
> ti_sn_aux_transfer()
> drm/bridge: ti-sn65dsi86: Make polling a busy loop
> drm/bridge: ti-sn65dsi86: Read EDID blob over DDC
> drm/bridge: ti-sn65dsi86: Update reply on aux failures

Series looks good. You can add my a-b on the full series.
Acked-by: Sam Ravnborg <>

I can apply after Douglas have had a look at the patches he did not r-b

Any chance we can convince you to prepare this bridge driver for use in
a chained bridge setup where the connector is created by the display
driver and uses drm_bridge_funcs?

First step wuld be to introduce the use of a panel_bridge.
Then add get_edid to drm_bridge_funcs and maybe more helpers.

Then natural final step would be to move connector creation to the
display driver - see how other uses drm_bridge_connector_init() to do so
- it is relatively simple.

Should be doable - and reach out if you need some help.


> drivers/gpu/drm/bridge/ti-sn65dsi86.c | 108 ++++++++++++++++++--------
> 1 file changed, 75 insertions(+), 33 deletions(-)
> Cc: Douglas Anderson <>
> Cc: Laurent Pinchart <>
> Cc: Jonas Karlman <>
> Cc: Jernej Skrabec <>
> Cc: Sean Paul <>
> base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
> --
> Sent by a computer, using git, on the internet
> _______________________________________________
> dri-devel mailing list

 \ /
  Last update: 2020-11-01 18:38    [W:0.138 / U:4.632 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site