linux-kernel - Re: [PATCH v12 27/28] drm/rockchip: inno

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Date: Mon, 6 May 2024 09:59:46 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Andy Yan <andy.yan@...k-chips.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Jonathan Corbet <corbet@....net>, 
	Sandy Huang <hjc@...k-chips.com>, Heiko Stübner <heiko@...ech.de>, 
	Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, Hans Verkuil <hverkuil@...all.nl>, 
	Sebastian Wick <sebastian.wick@...hat.com>, Ville Syrjälä <ville.syrjala@...ux.intel.com>, 
	dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
	linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v12 27/28] drm/rockchip: inno_hdmi: Switch to HDMI
 connector

Hi Andy,

Thanks a lot for giving it a try

All the issues you raised in your review are fixed.

On Sat, Apr 27, 2024 at 06:44:54PM GMT, Andy Yan wrote:
> And after this whole series applied on linux 6.9-rc4, the display on rk3036 kylin is lost, I get
> the following error:
> [  178.999421] rockchip-drm display-subsystem: [drm:drm_atomic_check_only] checking 87b7fbde
> [  178.999471] rockchip-drm display-subsystem: [drm:drm_atomic_helper_check_modeset] [CRTC:35:crtc-0] mode changed
> [  178.999498] rockchip-drm display-subsystem: [drm:drm_atomic_helper_check_modeset] [CRTC:35:crtc-0] enable changed
> [  178.999521] rockchip-drm display-subsystem: [drm:drm_atomic_helper_check_modeset] [CRTC:35:crtc-0] active changed
> [  178.999547] rockchip-drm display-subsystem: [drm:drm_atomic_helper_check_modeset] Updating routing for [CONNECTOR:37:HDMI-A-1]
> [  178.999575] rockchip-drm display-subsystem: [drm:drm_atomic_helper_check_modeset] [CONNECTOR:37:HDMI-A-1] using [ENCODER:36:TMDS-36] on [CRTC:35:crtc-0]
> [  178.999604] rockchip-drm display-subsystem: [drm:drm_atomic_helper_connector_hdmi_check] Trying with a 8 bpc output
> [  178.999636] rockchip-drm display-subsystem: [drm:drm_atomic_helper_connector_hdmi_check] Trying RGB output format
> [  178.999730] rockchip-drm display-subsystem: [drm:drm_atomic_helper_connector_hdmi_check] RGB Format, checking the constraints.
> [  178.999757] rockchip-drm display-subsystem: [drm:drm_atomic_helper_connector_hdmi_check] RGB output format not supported with 8 bpc
> [  178.999783] rockchip-drm display-subsystem: [drm:drm_atomic_helper_connector_hdmi_check] Failed. No Format Supported for that bpc count.
> [  178.999810] rockchip-drm display-subsystem: [drm:drm_atomic_helper_check_modeset] [CONNECTOR:37:HDMI-A-1] driver check failed
> [  178.999836] rockchip-drm display-subsystem: [drm:drm_atomic_check_only] atomic driver check for 87b7fbde failed: -22
> [  178.999868] rockchip-drm display-subsystem: [drm:drm_atomic_state_default_clear] Clearing atomic state 87b7fbde
> [  178.999898] [drm:drm_mode_object_put] OBJ ID: 37 (4)
> [  178.999922] [drm:drm_mode_object_put] OBJ ID: 37 (3)
> [  178.999944] [drm:drm_mode_object_put] OBJ ID: 40 (1)
> [  178.999971] [drm:drm_mode_object_put] OBJ ID: 39 (2)

Which kind of display are you testing with? The only reason it could do
so is if the display claim it doesn't support RGB in its EDID which is
contradicting the HDMI spec. Are you using an Analog display by any
chance? or the built-in EDIDs through the drm.edid_firmware mechanism?

Maxime

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