2019-09-19 14:43:19 +00:00
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From 36e1081459121883f9881a579c809c7b87895146 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 5 Feb 2018 18:01:02 +0000
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2019-09-19 14:43:19 +00:00
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Subject: [PATCH 119/806] drm/vc4: Fix warning about vblank interrupts before
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2019-07-09 18:32:28 +00:00
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DRM core is ready.
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The SMICS interrupt fires continuously, but since it's 1/100 the rate
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of the USB interrupts, we don't really need a way to turn it off. We
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do need to make sure that we don't tell DRM about it until DRM has
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asked for the interrupt at least once, because otherwise it will throw
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a warning at boot time.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/vc4/vc4_firmware_kms.c | 10 ++++++----
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1 file changed, 6 insertions(+), 4 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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@@ -43,6 +43,7 @@ struct vc4_crtc {
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struct drm_pending_vblank_event *event;
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u32 overscan[4];
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+ bool vblank_enabled;
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};
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static inline struct vc4_crtc *to_vc4_crtc(struct drm_crtc *crtc)
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@@ -420,7 +421,8 @@ static irqreturn_t vc4_crtc_irq_handler(
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if (stat & SMICS_INTERRUPTS) {
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writel(0, vc4_crtc->regs + SMICS);
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- drm_crtc_handle_vblank(&vc4_crtc->base);
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+ if (vc4_crtc->vblank_enabled)
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+ drm_crtc_handle_vblank(&vc4_crtc->base);
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vc4_crtc_handle_page_flip(vc4_crtc);
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ret = IRQ_HANDLED;
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}
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@@ -443,9 +445,9 @@ static int vc4_page_flip(struct drm_crtc
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static int vc4_fkms_enable_vblank(struct drm_crtc *crtc)
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{
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- /* XXX: Need a way to enable/disable the interrupt, to avoid
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- * DRM warnings at boot time.
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- */
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+ struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
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+
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+ vc4_crtc->vblank_enabled = true;
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return 0;
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}
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