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drm: rz-du: Ensure correct suspend/resume ordering with VSP

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The VSP serves as an interface to memory and a compositor to the DU. It
therefore needs to be suspended after and resumed before the DU, to be
properly stopped and restarted in a controlled fashion driven by the DU
driver. This currently works by chance. Avoid relying on luck by
enforcing the correct suspend/resume ordering with device links.

Based on similar work done by Laurent Pinchart for R-Car DU.
commit db5be3a7d6 ("drm: rcar-du: Ensure correct suspend/resume
ordering with VSP")

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/20260330144651.817338-1-tommaso.merciai.xr@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
This commit is contained in:
Tommaso Merciai 2026-03-30 16:46:47 +02:00 committed by Biju Das
parent 3e9a1da270
commit c94e765abb
2 changed files with 18 additions and 0 deletions
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16
drivers/gpu/drm/renesas/rz-du/rzg2l_du_vsp.c
View File

@ -20,6 +20,7 @@
#include <drm/drm_vblank.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
@ -293,6 +294,9 @@ static void rzg2l_du_vsp_cleanup(struct drm_device *dev, void *res)
{
struct rzg2l_du_vsp *vsp = res;
if (vsp->link)
device_link_del(vsp->link);
put_device(vsp->vsp);
}
@ -317,6 +321,18 @@ int rzg2l_du_vsp_init(struct rzg2l_du_vsp *vsp, struct device_node *np,
if (ret < 0)
return ret;
/*
* Enforce suspend/resume ordering between the DU (consumer) and the
* VSP (supplier). The DU will be suspended before and resume after the
* VSP.
*/
vsp->link = device_link_add(rcdu->dev, vsp->vsp, DL_FLAG_STATELESS);
if (!vsp->link) {
dev_err(rcdu->dev, "Failed to create device link to VSP %s\n",
dev_name(vsp->vsp));
return -EINVAL;
}
ret = vsp1_du_init(vsp->vsp);
if (ret < 0)
return ret;

2
drivers/gpu/drm/renesas/rz-du/rzg2l_du_vsp.h
View File

@ -15,6 +15,7 @@
#include <linux/scatterlist.h>
struct device;
struct device_link;
struct drm_framebuffer;
struct rzg2l_du_device;
struct rzg2l_du_format_info;
@ -29,6 +30,7 @@ struct rzg2l_du_vsp_plane {
struct rzg2l_du_vsp {
unsigned int index;
struct device *vsp;
struct device_link *link;
struct rzg2l_du_device *dev;
};