linux-kernel - [RFC AFBC 09/12] drm/arm/malidp:- Writeback framebuffer does not support any modifiers

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Date:   Mon, 3 Dec 2018 11:32:03 +0000
From:   Ayan Halder <Ayan.Halder@....com>
To:     Ayan Halder <Ayan.Halder@....com>,
        Liviu Dudau <Liviu.Dudau@....com>,
        Brian Starkey <Brian.Starkey@....com>,
        "malidp@...s.arm.com" <malidp@...s.arm.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        "sean@...rly.run" <sean@...rly.run>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "corbet@....net" <corbet@....net>,
        "mchehab+samsung@...nel.org" <mchehab+samsung@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
CC:     nd <nd@....com>
Subject: [RFC AFBC 09/12] drm/arm/malidp:- Writeback framebuffer does not
 support any modifiers

In malidp, the writeback pipeline does not support writing crtc output
to a framebuffer with modifiers ie the memory writeback content is
devoid of any compression or tiling, etc.
So we have added a commit check in memory writeback encoder helper function
to validate if the framebuffer has any modifier and if so, return EINVAL.

Signed-off-by: Ayan Kumar halder <ayan.halder@....com>
---
 drivers/gpu/drm/arm/malidp_mw.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
index 0484744..90c964a 100644
--- a/drivers/gpu/drm/arm/malidp_mw.c
+++ b/drivers/gpu/drm/arm/malidp_mw.c
@@ -141,6 +141,11 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
 		return -EINVAL;
 	}
 
+	if (fb->modifier) {
+		DRM_DEBUG_KMS("Writeback framebuffer does not support modifiers\n");
+		return -EINVAL;
+	}
+
 	mw_state->format =
 		malidp_hw_get_format_id(&malidp->dev->hw->map, SE_MEMWRITE,
 					fb->format->format, !!fb->modifier);
-- 
2.7.4