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Date: Tue, 6 Jun 2023 11:05:18 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Aradhya Bhatia <a-bhatia1@...com>,
Tomi Valkeinen <tomba@...nel.org>,
Jyri Sarha <jyri.sarha@....fi>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Robert Foss <rfoss@...nel.org>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Swapnil Jakhade <sjakhade@...ence.com>,
Boris Brezillon <boris.brezillon@...labora.com>,
Francesco Dolcini <francesco@...cini.it>
Cc: DRI Development List <dri-devel@...ts.freedesktop.org>,
Linux Kernel List <linux-kernel@...r.kernel.org>,
Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Rahul T R <r-ravikumar@...com>,
Devarsh Thakkar <devarsht@...com>,
Jayesh Choudhary <j-choudhary@...com>
Subject: Re: [PATCH v7 3/8] drm/bridge: mhdp8546: Add minimal format
negotiation
On 06/06/2023 10:21, Aradhya Bhatia wrote:
> From: Nikhil Devshatwar <nikhil.nd@...com>
>
> With new connector model, mhdp bridge will not create the connector and
> SoC driver will rely on format negotiation to setup the encoder format.
>
> Support minimal format negotiations hooks in the drm_bridge_funcs.
> Complete format negotiation can be added based on EDID data.
> This patch adds the minimal required support to avoid failure
> after moving to new connector model.
>
> Signed-off-by: Nikhil Devshatwar <nikhil.nd@...com>
> [a-bhatia1: Drop the output_fmt check condition]
> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
> ---
>
> Notes:
>
> changes from v1:
> * cosmetic fixes, commit message update.
>
> changes from v5:
> * drop the default_bus_format variable and directly assigned
> MEDIA_BUS_FMT_RGB121212_1X36 to input_fmts.
>
> changes from v6:
> * Drop the output_fmt check condition and hence drop Tomi
> Valkeinen's R-b tag.
>
> .../drm/bridge/cadence/cdns-mhdp8546-core.c | 22 +++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index f6822dfa3805..afd4e353f37a 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -2146,6 +2146,27 @@ cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge)
> return &cdns_mhdp_state->base;
> }
>
> +static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state,
> + u32 output_fmt,
> + unsigned int *num_input_fmts)
> +{
> + u32 *input_fmts;
> +
> + *num_input_fmts = 0;
> +
> + input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
> + if (!input_fmts)
> + return NULL;
> +
> + *num_input_fmts = 1;
> + input_fmts[0] = MEDIA_BUS_FMT_RGB121212_1X36;
> +
> + return input_fmts;
> +}
> +
> static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
> struct drm_bridge_state *bridge_state,
> struct drm_crtc_state *crtc_state,
> @@ -2210,6 +2231,7 @@ static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
> .atomic_duplicate_state = cdns_mhdp_bridge_atomic_duplicate_state,
> .atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state,
> .atomic_reset = cdns_mhdp_bridge_atomic_reset,
> + .atomic_get_input_bus_fmts = cdns_mhdp_get_input_bus_fmts,
> .detect = cdns_mhdp_bridge_detect,
> .get_edid = cdns_mhdp_bridge_get_edid,
> .hpd_enable = cdns_mhdp_bridge_hpd_enable,
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
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