linux-kernel - [PATCH v4 17/25] drm/msm/dpu: Fail atomic

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Message-ID: <20241216-concurrent-wb-v4-17-fe220297a7f0@quicinc.com>
Date: Mon, 16 Dec 2024 16:43:28 -0800
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        <quic_abhinavk@...cinc.com>, Sean Paul
	<sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        "David
 Airlie" <airlied@...il.com>,
        Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Simona Vetter <simona@...ll.ch>,
        Simona Vetter <simona.vetter@...ll.ch>
CC: <quic_ebharadw@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, Rob Clark <robdclark@...omium.org>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        "Jessica
 Zhang" <quic_jesszhan@...cinc.com>
Subject: [PATCH v4 17/25] drm/msm/dpu: Fail atomic_check if CWB and CDM are
 enabled

We cannot support both CWB and CDM simultaneously as this would require
2 CDM blocks and currently our hardware only supports 1 CDM block at
most.

Thus return an error if both CWB and CDM are enabled.

Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 9bb920d28bae2706b3892c167fe2bec3fd8857f4..a6372eee916e8aba702bbefc3615d8882ddcaad9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1261,6 +1261,10 @@ static int dpu_crtc_assign_resources(struct drm_crtc *crtc, struct drm_crtc_stat
 		return 0;
 
 	topology = dpu_crtc_get_topology(crtc, dpu_kms, crtc_state);
+
+	if (topology.cwb_enabled && topology.needs_cdm)
+		return -EINVAL;
+
 	ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
 			     crtc, &topology);
 	if (ret)

-- 
2.34.1