linux-kernel - Re: [PATCH v7 12/19] drm/imx: Add i.MX8qxp Display Controller KMS

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Message-ID: <wpxxedxabgo2kxf5wuosu76i5ud3ce2tywm2imhvad4nyy5u2d@qgfhev2hndba>
Date: Mon, 23 Dec 2024 13:32:10 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Liu Ying <victor.liu@....com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, p.zabel@...gutronix.de, 
	airlied@...il.com, simona@...ll.ch, maarten.lankhorst@...ux.intel.com, 
	mripard@...nel.org, tzimmermann@...e.de, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de, 
	kernel@...gutronix.de, festevam@...il.com, tglx@...utronix.de, vkoul@...nel.org, 
	kishon@...nel.org, aisheng.dong@....com, agx@...xcpu.org, 
	u.kleine-koenig@...libre.com, francesco@...cini.it, frank.li@....com
Subject: Re: [PATCH v7 12/19] drm/imx: Add i.MX8qxp Display Controller KMS

On Mon, Dec 23, 2024 at 02:41:40PM +0800, Liu Ying wrote:
> i.MX8qxp Display Controller(DC) is comprised of three main components that
> include a blit engine for 2D graphics accelerations, display controller for
> display output processing, as well as a command sequencer.  Add kernel
> mode setting support for the display controller part with two CRTCs and
> two primary planes(backed by FetchLayer and FetchWarp respectively).  The
> registers of the display controller are accessed without command sequencer
> involved, instead just by using CPU.  The command sequencer is supposed to
> be used by the blit engine.
> 
> Reviewed-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
> v7:
> * Drop using typeof in macros and explicitly define variable types. (Dmitry)
> * Add a comment for disable_irq_nosync() to explain why _nosync. (Dmitry)
> * Inline dc_crtc_check_clock(). (Dmitry)
> * Use global drm_dc->pe. (Dmitry)
> * Drop dc_crtc_disable_at_unbind(). (Dmitry)
> * Add kernel doc for struct dc_{crtc,drm_device,plane}. (Dmitry)
> * Define common IRQ handlers separately for each IRQs. (Dmitry)
> * Rebase this patch upon next-20241220, so drop date entry from drm_driver
>   and correctly include drm/clients/drm_client_setup.h.
> * Collect Maxime's R-b tag.
> 
> v6:
> * No change.
> 
> v5:
> * Replace .remove_new with .remove in dc-drv.c. (Uwe)
> 
> v4:
> * Move dc_fg_displaymode(), dc_fg_panic_displaymode() and dc_lb_blendcontrol()
>   function calls from KMS routine to initialization stage. (Dmitry)
> * Drop dc-crtc.h and dc-plane.h header files and move relevant defines to
>   appropriate .h header files or .c source files. (Dmitry)
> * Drop futile "else" clause from dc_crtc_common_irq_handler(). (Dmitry)
> * Drop dc_drm->pe_rpm_count. (Dmitry)
> * Drop DC_{CRTCS,ENCODERS,PRIMARYS} macros and only use DC_DISPLAYS. (Dmitry)
> * Drop drmm_kcalloc() function call to allocate an array for storing IRQs.
>   Instead, put it in struct dc_crtc.  (Dmitry)
> * Call devm_request_irq() to request IRQs, instead of using drmm action.
>   (Dmitry)
> * Call devm_drm_of_get_bridge() to find the next bridge. (Dmitry)
> * Select DRM_CLIENT_SELECTION due to rebase.
> * Select the missing DRM_DISPLAY_HELPER and DRM_BRIDGE_CONNECTOR.
> * Use DRM_FBDEV_DMA_DRIVER_OPS due to rebase.
> * Replace drm_fbdev_dma_setup() with drm_client_setup_with_fourcc() due to
>   rebase.
> * Replace drmm_add_action_or_reset() with devm_add_action_or_reset() to
>   register dc_drm_component_unbind_all() action.
> * Request interrupts in dc_crtc_post_init() after encoder initialization to
>   make sure next bridge is found first.
> 
> v3:
> * No change.
> 
> v2:
> * Find next bridge from TCon's port.
> * Drop drm/drm_module.h include from dc-drv.c.
> 
>  drivers/gpu/drm/imx/dc/Kconfig    |   5 +
>  drivers/gpu/drm/imx/dc/Makefile   |   5 +-
>  drivers/gpu/drm/imx/dc/dc-crtc.c  | 556 ++++++++++++++++++++++++++++++
>  drivers/gpu/drm/imx/dc/dc-de.h    |   3 +
>  drivers/gpu/drm/imx/dc/dc-drv.c   | 238 +++++++++++++
>  drivers/gpu/drm/imx/dc/dc-drv.h   |  22 ++
>  drivers/gpu/drm/imx/dc/dc-kms.c   | 143 ++++++++
>  drivers/gpu/drm/imx/dc/dc-kms.h   | 131 +++++++
>  drivers/gpu/drm/imx/dc/dc-plane.c | 241 +++++++++++++
>  9 files changed, 1342 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/gpu/drm/imx/dc/dc-crtc.c
>  create mode 100644 drivers/gpu/drm/imx/dc/dc-kms.c
>  create mode 100644 drivers/gpu/drm/imx/dc/dc-kms.h
>  create mode 100644 drivers/gpu/drm/imx/dc/dc-plane.c
> 


> +
> +static int dc_plane_check_no_off_screen(struct drm_plane_state *state,
> +					struct drm_crtc_state *crtc_state)
> +{
> +	if (state->dst.x1 < 0 || state->dst.y1 < 0 ||
> +	    state->dst.x2 > crtc_state->adjusted_mode.hdisplay ||
> +	    state->dst.y2 > crtc_state->adjusted_mode.vdisplay) {
> +		dc_plane_dbg(state->plane, "no off screen\n");
> +		return -EINVAL;
> +	}

Nit: doesn't drm_atomic_helper_check_plane_state() ensure in this already?

With that in mind

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


> +
> +	return 0;
> +}
> +
-- 
With best wishes
Dmitry