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Date: Tue, 16 May 2023 09:24:24 +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>,
Rahul T R <r-ravikumar@...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>,
Devarsh Thakkar <devarsht@...com>,
Jayesh Choudhary <j-choudhary@...com>
Subject: Re: [PATCH v6 4/8] drm/bridge: mhdp8546: Set input_bus_flags from
atomic_check
On 09/05/2023 11:30, Aradhya Bhatia wrote:
> From: Nikhil Devshatwar <nikhil.nd@...com>
>
> input_bus_flags are specified in drm_bridge_timings (legacy) as well
> as drm_bridge_state->input_bus_cfg.flags
>
> The flags from the timings will be deprecated. Bridges are supposed
> to validate and set the bridge state flags from atomic_check.
>
> Signed-off-by: Nikhil Devshatwar <nikhil.nd@...com>
> [a-bhatia1: replace timings in cdns_mhdp_platform_info by input_bus_flags]
> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
> ---
>
> Notes:
>
> changes from v5:
> * removed the wrongly addded return statement in tfp410 driver.
> * replaced the timings field in cdns_mhdp_platform_info by
> input_bus_flags field, in order to get rid of bridge->timings
> altogether.
>
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 11 ++++++++---
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h | 2 +-
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c | 9 ++++-----
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h | 2 +-
> 4 files changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index 623e4235c94f..a677b1267525 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -2189,6 +2189,13 @@ static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
> return -EINVAL;
> }
>
> + /*
> + * There might be flags negotiation supported in future.
> + * Set the bus flags in atomic_check statically for now.
> + */
> + if (mhdp->info)
> + bridge_state->input_bus_cfg.flags = *mhdp->info->input_bus_flags;
> +
> mutex_unlock(&mhdp->link_mutex);
> return 0;
> }
> @@ -2554,8 +2561,6 @@ static int cdns_mhdp_probe(struct platform_device *pdev)
> mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
> DRM_BRIDGE_OP_HPD;
> mhdp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
> - if (mhdp->info)
> - mhdp->bridge.timings = mhdp->info->timings;
Won't this cause a breakage because at this point in time bridge.timings->input_bus_flags
seems to be still used by tidss right ?
Neil
>
> ret = phy_init(mhdp->phy);
> if (ret) {
> @@ -2642,7 +2647,7 @@ static const struct of_device_id mhdp_ids[] = {
> #ifdef CONFIG_DRM_CDNS_MHDP8546_J721E
> { .compatible = "ti,j721e-mhdp8546",
> .data = &(const struct cdns_mhdp_platform_info) {
> - .timings = &mhdp_ti_j721e_bridge_timings,
> + .input_bus_flags = &mhdp_ti_j721e_bridge_input_bus_flags,
> .ops = &mhdp_ti_j721e_ops,
> },
> },
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
> index bedddd510d17..bad2fc0c7306 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
> @@ -336,7 +336,7 @@ struct cdns_mhdp_bridge_state {
> };
>
> struct cdns_mhdp_platform_info {
> - const struct drm_bridge_timings *timings;
> + const u32 *input_bus_flags;
> const struct mhdp_platform_ops *ops;
> };
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
> index dfe1b59514f7..12d04be4e242 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
> @@ -71,8 +71,7 @@ const struct mhdp_platform_ops mhdp_ti_j721e_ops = {
> .disable = cdns_mhdp_j721e_disable,
> };
>
> -const struct drm_bridge_timings mhdp_ti_j721e_bridge_timings = {
> - .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE |
> - DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE |
> - DRM_BUS_FLAG_DE_HIGH,
> -};
> +const u32
> +mhdp_ti_j721e_bridge_input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE |
> + DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE |
> + DRM_BUS_FLAG_DE_HIGH;
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
> index 97d20d115a24..5ddca07a4255 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
> @@ -14,6 +14,6 @@
> struct mhdp_platform_ops;
>
> extern const struct mhdp_platform_ops mhdp_ti_j721e_ops;
> -extern const struct drm_bridge_timings mhdp_ti_j721e_bridge_timings;
> +extern const u32 mhdp_ti_j721e_bridge_input_bus_flags;
>
> #endif /* !CDNS_MHDP8546_J721E_H */
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