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Thu, 05 Jan 2023 17:40:29 -0800 (PST) Received: from localhost ([2620:15c:9d:2:5567:fb20:aa4f:352]) by smtp.gmail.com with UTF8SMTPSA id 142-20020a621994000000b00575caf80d08sm17868008pfz.31.2023.01.05.17.40.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Jan 2023 17:40:28 -0800 (PST) From: Brian Norris To: =?utf-8?q?Heiko_St=C3=BCbner?= , Sean Paul Cc: Sandy Huang , =?utf-8?q?Michel_D=C3=A4nzer?= , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org, Brian Norris , stable@vger.kernel.org, "kernelci.org bot" Subject: [PATCH 2/2] drm/rockchip: vop: Leave vblank enabled in self-refresh Date: Thu, 5 Jan 2023 17:40:18 -0800 Message-Id: <20230105174001.2.Ic07cba4ab9a7bd3618a9e4258b8f92ea7d10ae5a@changeid> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog In-Reply-To: <20230105174001.1.I3904f697863649eb1be540ecca147a66e42bfad7@changeid> References: <20230105174001.1.I3904f697863649eb1be540ecca147a66e42bfad7@changeid> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230105_174030_389307_8D403521 X-CRM114-Status: GOOD ( 19.08 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org If we disable vblank when entering self-refresh, vblank APIs (like DRM_IOCTL_WAIT_VBLANK) no longer work. But user space is not aware when we enter self-refresh, so this appears to be an API violation -- that DRM_IOCTL_WAIT_VBLANK fails with EINVAL whenever the display is idle and enters self-refresh. The downstream driver used by many of these systems never used to disable vblank for PSR, and in fact, even upstream, we didn't do that until radically redesigning the state machine in commit 6c836d965bad ("drm/rockchip: Use the helpers for PSR"). Thus, it seems like a reasonable API fix to simply restore that behavior, and leave vblank enabled. Note that this appears to potentially unbalance the drm_crtc_vblank_{off,on}() calls in some cases, but: (a) drm_crtc_vblank_on() documents this as OK and (b) if I do the naive balancing, I find state machine issues such that we're not in sync properly; so it's easier to take advantage of (a). Backporting notes: Marking as 'Fixes' commit 6c836d965bad ("drm/rockchip: Use the helpers for PSR"), but it probably depends on commit bed030a49f3e ("drm/rockchip: Don't fully disable vop on self refresh") as well. We also need the previous patch ("drm/atomic: Allow vblank-enabled + self-refresh "disable""), of course. Fixes: 6c836d965bad ("drm/rockchip: Use the helpers for PSR") Cc: Link: https://lore.kernel.org/dri-devel/Y5itf0+yNIQa6fU4@sirena.org.uk/ Reported-by: "kernelci.org bot" Signed-off-by: Brian Norris --- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index fa1f4ee6d195..c541967114b4 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -719,11 +719,11 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc, mutex_lock(&vop->vop_lock); - drm_crtc_vblank_off(crtc); - if (crtc->state->self_refresh_active) goto out; + drm_crtc_vblank_off(crtc); + /* * Vop standby will take effect at end of current frame, * if dsp hold valid irq happen, it means standby complete.