From nobody Tue Dec 16 07:09:10 2025 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 99422246A0B for ; Wed, 15 Jan 2025 09:04:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736931842; cv=none; b=AcubigwjmHkvwMUHA9FcKOIDGrGslOHy1+B3SGiOblrt394uLpx21W//FAjSVTmO5KH/qhC2NvOXojyj3f+kg7o2sajNYFzvFQMQM9HSU81inGy42CqiXvo+xUHJ/fo2u99GvhnFDqH8SW8uqu8xQbhXT2NDIT2M7nqZULYX43g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736931842; c=relaxed/simple; bh=BAt3uc6nPGNZCBjCplDEQ3lvr4SijGOwtJPTUPOoygU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=i8NJ3gTDGsW/EDTHY4cxzALh4LfpmVC+2KQWnmHEh4AwCye5NPtJOGdsalQDJSfkOtaIOwDWtSi7/mBaSOH8TUFRRErRYejViejM5AbxwI4xPMsL5XXEhk/qKYRz3k2/4vA+v0zhQsEiOHKj2Mh/4Lcdco/QpOCjqpa/OKCb4zs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=nBvNIVCM; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="nBvNIVCM" Received: from [127.0.1.1] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id AFEDA73E; Wed, 15 Jan 2025 10:02:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1736931780; bh=BAt3uc6nPGNZCBjCplDEQ3lvr4SijGOwtJPTUPOoygU=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=nBvNIVCMJcFLjsyAAiwgEAt22A7Vww6QXRNRtXliezNxkib1UBowCwAzEcZtiayev k8umeN5vz1EJ4/dxA3u0hlEgTp20+ceuRbSyDFK/VW+km0RuHALpHpfcGORL6K562f +TEuOYVo2flPlgQZ1bVaYq9z59ioFnLF539Px4Ps= From: Tomi Valkeinen Date: Wed, 15 Jan 2025 11:03:30 +0200 Subject: [PATCH v2 01/10] drm/fourcc: Add warning for bad bpp Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250115-xilinx-formats-v2-1-160327ca652a@ideasonboard.com> References: <20250115-xilinx-formats-v2-0-160327ca652a@ideasonboard.com> In-Reply-To: <20250115-xilinx-formats-v2-0-160327ca652a@ideasonboard.com> To: Vishal Sagar , Anatoliy Klymenko , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Laurent Pinchart , Michal Simek Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Tomi Valkeinen X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1442; i=tomi.valkeinen@ideasonboard.com; h=from:subject:message-id; bh=BAt3uc6nPGNZCBjCplDEQ3lvr4SijGOwtJPTUPOoygU=; b=owEBbQKS/ZANAwAIAfo9qoy8lh71AcsmYgBnh3n48iSXc2BjCEN+uQsHpIk0Q7sns9A9Gr17N grkQiX/f7CJAjMEAAEIAB0WIQTEOAw+ll79gQef86f6PaqMvJYe9QUCZ4d5+AAKCRD6PaqMvJYe 9fDDD/43GBkraeVwOyPiSc0RunT0Nk4jtVZ9ZopUVkIIdWStVtde4EhMxJPHIa+gPEmUnzmr1tX m+/LjX5qGj/UKXLdEOd0m3BqfjGbUBg6nsR3nDc8r3d4dJEZgp+0hPNbbIXemb/FKtvRobqSr2w wrzOQUEk7Q0boBDI+9uJUrf+laEhRCOKBkLedKtsJ1Vla6EXuaORV8CUx7oXvPOHNJ05QM+ekPa HAX2OMcRbhvAHC0f1XhXc3AxoEH+CV3m2SytVRLkowQoEkS2WKcC3DVomB177DbjxC9Pj5Sz57g LqFf8D901TFXmVvTAzB0eLHniNjDzN67AGFdCmcIX0ozGZklFpjfJS6oyWa62VPOzumjsny2NOU Pm6M9e6zGCfScXU8DUExHBvfcoLCtLpWV6eLJM0VA7CVgNS3BLZ66E8Cv4WsP9hmhKUmIoCrAP0 3MTY+e9Gle6idG/+K7iDcyfJS5KMeJiHmkH6CO8BuGvneaMBVzVOZ2d3XMtEXOOiPLeZvMsFMZL iqz535t+/p/o3wiueR4CC+QgUD2R7K6pMK8OqA6Bb/i+3B4fZ93L/UkwxR5vXooQvL03l+RHJ08 y4GDcL+NROcYz6NBpAJOczSZ+QNtjk7p2W4EApu+05V1qmPUpR1t76GR96ATbCxLRJZoDStgp0z DW0Hj54r1NWFmUg== X-Developer-Key: i=tomi.valkeinen@ideasonboard.com; a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 drm_format_info_bpp() cannot be used for formats which do not have an integer bits-per-pixel in a pixel block. E.g. DRM_FORMAT_XV15's (not yet in upstream) plane 0 has three 10-bit pixels (Y components), and two padding bits, in a 4 byte block. That is 10.666... bits per pixel when considering the whole 4 byte block, which is what drm_format_info_bpp() does. Thus a driver that supports such formats cannot use drm_format_info_bpp(), It is a driver bug if this happens, but so handle wrong calls by printing a warning and returning 0. Signed-off-by: Tomi Valkeinen --- drivers/gpu/drm/drm_fourcc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c index 193cf8ed7912..e84c4ed6928c 100644 --- a/drivers/gpu/drm/drm_fourcc.c +++ b/drivers/gpu/drm/drm_fourcc.c @@ -429,6 +429,13 @@ unsigned int drm_format_info_bpp(const struct drm_form= at_info *info, int plane) if (!info || plane < 0 || plane >=3D info->num_planes) return 0; =20 + if (info->char_per_block[plane] * 8 % + (drm_format_info_block_width(info, plane) * + drm_format_info_block_height(info, plane))) { + pr_warn("unable to return an integer bpp\n"); + return 0; + } + return info->char_per_block[plane] * 8 / (drm_format_info_block_width(info, plane) * drm_format_info_block_height(info, plane)); --=20 2.43.0