lkml.org 
[lkml]   [2017]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 4.4 28/40] drm/msm/dsi: Set msm_dsi->encoders before initializing bridge
From
Date
Hi Greg,

On 11/06/2017 03:15 PM, Greg Kroah-Hartman wrote:
> 4.4-stable review patch. If anyone has any objections, please let me know.

This patch isn't needed on 4.4 or the 4.9 stable branches. This was required
only after drm_bridge API was changed with the commit:

(3bb80f2495) drm: bridge: Link encoder and bridge in core code

This was merged only in 4.11.

Thanks,
Archit

>
> ------------------
>
> From: Archit Taneja <architt@codeaurora.org>
>
>
> [ Upstream commit 0bb70b82c2f91e4667f3c617505235efd6d77e46 ]
>
> The commit "drm: bridge: Link encoder and bridge in core code" updated
> the drm_bridge_attach() API to also include the drm_encoder pointer
> the bridge attaches to.
>
> The func msm_dsi_manager_bridge_init() now relies on the drm_encoder
> pointer stored in msm_dsi->encoders to pass the encoder to the bridge
> API.
>
> msm_dsi->encoders is unfortunately set after this function is called,
> resulting in us passing a NULL pointer to drm_brigde_attach. This
> results in an error and the DSI driver probe fails.
>
> Move the initialization of msm_dsi->encoders[] a bit up. Also, don't
> try to set the encoder's bridge. That's now managed by the bridge
> API.
>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> Signed-off-by: Rob Clark <robdclark@gmail.com>
> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
> drivers/gpu/drm/msm/dsi/dsi.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> --- a/drivers/gpu/drm/msm/dsi/dsi.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi.c
> @@ -205,6 +205,9 @@ int msm_dsi_modeset_init(struct msm_dsi
> goto fail;
> }
>
> + for (i = 0; i < MSM_DSI_ENCODER_NUM; i++)
> + msm_dsi->encoders[i] = encoders[i];
> +
> msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
> if (IS_ERR(msm_dsi->bridge)) {
> ret = PTR_ERR(msm_dsi->bridge);
> @@ -213,11 +216,6 @@ int msm_dsi_modeset_init(struct msm_dsi
> goto fail;
> }
>
> - for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
> - encoders[i]->bridge = msm_dsi->bridge;
> - msm_dsi->encoders[i] = encoders[i];
> - }
> -
> /*
> * check if the dsi encoder output is connected to a panel or an
> * external bridge. We create a connector only if we're connected to a
>
>

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

\
 
 \ /
  Last update: 2017-11-08 21:02    [W:5.324 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site