linux-kernel - Re: [PATCH v3 5/9] drm: xlnx: zynqmp_dpsub: Minimize usage of global flag

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Date: Fri, 5 Apr 2024 15:42:45 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Anatoliy Klymenko <anatoliy.klymenko@....com>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-media@...r.kernel.org,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Michal Simek <michal.simek@....com>, Andrzej Hajda
 <andrzej.hajda@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>,
 Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>,
 Jernej Skrabec <jernej.skrabec@...il.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH v3 5/9] drm: xlnx: zynqmp_dpsub: Minimize usage of global
 flag

On 21/03/2024 22:43, Anatoliy Klymenko wrote:
> Avoid usage of global zynqmp_dpsub.dma_enabled flag in DPSUB layer
> context. This flag signals whether the driver runs in DRM CRTC or DRM
> bridge mode, assuming that all display layers share the same live or
> non-live mode of operation. Using per-layer mode instead of global flag
> will simplify future support of the hybrid scenario.
> 
> Remove redundant checks in DMA request/release contexts as
> zynqmp_disp_layer.info is well-defined for all layer types, including the
> correct number of DMA channels required for each particular layer.
> 
> Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@....com>
> ---
>   drivers/gpu/drm/xlnx/zynqmp_disp.c | 12 +++---------
>   1 file changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> index abdc3971b193..0c2b3f4bffa6 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> @@ -980,7 +980,7 @@ void zynqmp_disp_layer_disable(struct zynqmp_disp_layer *layer)
>   {
>   	unsigned int i;
>   
> -	if (layer->disp->dpsub->dma_enabled) {
> +	if (layer->mode == ZYNQMP_DPSUB_LAYER_NONLIVE) {
>   		for (i = 0; i < layer->drm_fmt->num_planes; i++)
>   			dmaengine_terminate_sync(layer->dmas[i].chan);
>   	}
> @@ -1006,7 +1006,7 @@ void zynqmp_disp_layer_set_format(struct zynqmp_disp_layer *layer,
>   
>   	zynqmp_disp_avbuf_set_format(layer->disp, layer, layer->disp_fmt);
>   
> -	if (!layer->disp->dpsub->dma_enabled)
> +	if (layer->mode == ZYNQMP_DPSUB_LAYER_LIVE)
>   		return;
>   
>   	/*
> @@ -1044,7 +1044,7 @@ int zynqmp_disp_layer_update(struct zynqmp_disp_layer *layer,
>   	const struct drm_format_info *info = layer->drm_fmt;
>   	unsigned int i;
>   
> -	if (!layer->disp->dpsub->dma_enabled)
> +	if (layer->mode == ZYNQMP_DPSUB_LAYER_LIVE)
>   		return 0;
>   
>   	for (i = 0; i < info->num_planes; i++) {
> @@ -1094,9 +1094,6 @@ static void zynqmp_disp_layer_release_dma(struct zynqmp_disp *disp,
>   {
>   	unsigned int i;
>   
> -	if (!layer->info || !disp->dpsub->dma_enabled)
> -		return;
> -
>   	for (i = 0; i < layer->info->num_channels; i++) {
>   		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
>   
> @@ -1137,9 +1134,6 @@ static int zynqmp_disp_layer_request_dma(struct zynqmp_disp *disp,
>   	unsigned int i;
>   	int ret;
>   
> -	if (!disp->dpsub->dma_enabled)
> -		return 0;
> -
>   	for (i = 0; i < layer->info->num_channels; i++) {
>   		struct zynqmp_disp_layer_dma *dma = &layer->dmas[i];
>   		char dma_channel_name[16];
> 

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

  Tomi