From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 399D5C47BC4 for ; Tue, 6 Jan 2026 08:30:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=oKSD+DfZplRgQ3I5P1QWUyAqtr2bHihEFGy3fCMDYBc=; b=2hrj5oMYCyIgFKUx7qJ+YI1imq P2e8TmtOsUGvX9FUwCiGMKQvoayDNqAv46LD5uooP1zaLMg3fKUULwDTxkcJNcBiKUV6tjv8q6fdn ZPZ75KGpkPM4pMzYS+hAlUrKmRQ40H8xlLu9KBnh3H1Vx8qEedfj4aM0rhgveU0eYSXk8eTnQL6pu ECcHxkSScPjpS9LYM+om7lRj/AOpcTLKTDRNdKF3sI2t4DtLni0g8fYtJlT446USM1dZ8WXvNgJel CCYqGwTGX408LIs5ptm2TknycE45v278GurpMSjMNE160JuqeMycgrMiAOf0NR9JCC7MmB2aWgCm8 fAU6Xzkw==; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260106_002948_654251_98F255FC X-CRM114-Status: GOOD ( 23.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 06/01/2026 09:41, Thomas Zimmermann wrote: > Hi > > Am 22.12.25 um 09:58 schrieb Mikko Rapeli: >> Hi, >> >> On Fri, Dec 19, 2025 at 02:30:11PM +0200, Mikko Rapeli wrote: >>> On Fri, Dec 19, 2025 at 01:59:14PM +0200, Tomi Valkeinen wrote: >>>> On 05/12/2025 14:37, Mikko Rapeli wrote: >>>>> Currently on default yocto images Xorg fails to start on AMD KV260 >>>>> because 24/32 color depth gets detected but does not actually work. >>>>> >>>>> These two patches fix the issue and now 16 bpp gets detected >>>>> and Xorg starts and draws on external HDMI display using >>>>> kernel.org based linux-yocto kernel. >>>>> >>>>> Anatoliy Klymenko (1): >>>>>    drm: xlnx: zynqmp_kms: Init fbdev with 16 bit color >>>>> >>>>> Mikko Rapeli (1): >>>>>    drm: xlnx: zynqmp_kms: set preferred_depth to 16 bpp >>>>> >>>>>   drivers/gpu/drm/xlnx/zynqmp_kms.c | 3 ++- >>>>>   1 file changed, 2 insertions(+), 1 deletion(-) >>>>> >>>> Did you notice the few already sent serieses on the list where the >>>> topic >>>> has been discussed? >>>> [PATCH] drm: xlnx: zynqmp_dp: Support DRM_FORMAT_XRGB8888 >>>> [PATCH 0/3] drm: zynqmp: Make the video plane primary >>> Oh I wasn't aware of these. >>> >>>> Or is there something else on KV260 that messes up the 24 bit color? >>> These look very similar and likely fix the X11 startup. I will give them >>> a try. >> Right, now I've tested: >> >>   * these patches from Anatoliy and me to help X11 use 16bpp mode by >> default >>     and removes the need to manually setup Xorg for 16bpp >>   * "drm: xlnx: zynqmp_dp: Support DRM_FORMAT_XRGB8888" which enables >> the X11 default >>     24bpp to work, no need to set Xorg config to 16bpp >>   * "drm: zynqmp: Make the video plane primary" which also fixes the >> X11 default >>     24bpp to work, no need to set Xorg config to 16bpp >> >> All of these fix HDMI graphics output on AMD KV260 board with yocto >> genericarm64 machine >> and core-image-sato image which includes Xorg. The graphics rendering >> is still >> very slow but I think that is a different problem. >> >> I guess the last series from Sean Anderson is moving forward so I'll >> reply to that thread separately. > > Just want to say that the series here improves xlnx and makes it a > 'better' driver. IMHO the changes should be merged independently from > what happens with the other series. I might be missing something, but I don't think I fully agree. Yes, the userspace doesn't seem to be able to cope with the current upstream driver behavior (even if it's not wrong as such, afaics), so in that sense this series is better. But I don't think (almost) anyone really wants to use RGB565 if XRGB8888 is an option? And that's what the other series is trying to achieve, and that series conflicts with this one. So I'd rather try to get a conclusion on Sean's series (or the other one from Mike). If that effort fails, we could go with this series as a backup. Tomi