From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A58A635B138; Fri, 9 Jan 2026 12:47:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767962846; cv=none; b=YYnsU33l4rYF35RBHqaMPtgJKkwekpEJoSCAicCGEDFhmE8tWY+p73e0gyMcCeFYUaUHimOXme28HgXVpSKOwmZGOYmt07/KEck+evK5eenzLe9ohIckDwY240/kiwQckWCFINfunG8iPIhC+sTOyDL4goMIjzQjE7mOlaPRIQc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767962846; c=relaxed/simple; bh=eTGiundHwuXVLq7M0d8QX+uf9ziD2sYS5kUmcGTkZD0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JuyVPL8DTP++AoscNUZiFKHe/FIDeOgSnUBozdPxdJKkMjIx4pO4e0PapENHtSHUIvd+kmHY9hmJQNKHDoxhQIa+I2bx4M1GL8j5YyO7gwxVty/+Uespr8qAXh25Z4v7I/pi+lW8w3aC7vD1n9HuMT8UAKyXPlg+fmqv8BwZgdk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NRlyHIKZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NRlyHIKZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34DEFC4CEF1; Fri, 9 Jan 2026 12:47:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767962846; bh=eTGiundHwuXVLq7M0d8QX+uf9ziD2sYS5kUmcGTkZD0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NRlyHIKZkosBQhZ56lg+jrYNWl7cbsRj1ZIYW86mIQUU86oU/GkWBljRm4Dn8kPRS QgD3T+6PunTJ0U51HkgHvhdkrCxAefkQSd9nljpPXUc++FZNyCor1BnDtT61QCAJkB SoubPbdD0VJpbjQVMbebPu89KzZs0Spt4jPrYzeo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Ren=C3=A9=20Rebe?= , stable@kernel.org, Thomas Zimmermann Subject: [PATCH 6.1 508/634] drm/mgag200: Fix big-endian support Date: Fri, 9 Jan 2026 12:43:06 +0100 Message-ID: <20260109112136.666772275@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112117.407257400@linuxfoundation.org> References: <20260109112117.407257400@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: René Rebe commit 6cb31fba137d45e682ce455b8ea364f44d5d4f98 upstream. Unlike the original, deleted Matrox mga driver, the new mgag200 driver has the XRGB frame-buffer byte swapped on big-endian "RISC" systems. Fix by enabling byte swapping "PowerPC" OPMODE for any __BIG_ENDIAN config. Fixes: 414c45310625 ("mgag200: initial g200se driver (v2)") Signed-off-by: René Rebe Cc: stable@kernel.org Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Link: https://patch.msgid.link/20251208.141827.965103015954471168.rene@exactco.de Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/mgag200/mgag200_mode.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) --- a/drivers/gpu/drm/mgag200/mgag200_mode.c +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c @@ -173,6 +173,30 @@ static void mgag200_set_startadd(struct WREG_ECRT(0x00, crtcext0); } +/* + * Set the opmode for the hardware swapper for Big-Endian processor + * support for the frame buffer aperture and DMAWIN space. + */ +static void mgag200_set_datasiz(struct mga_device *mdev, u32 format) +{ +#if defined(__BIG_ENDIAN) + u32 opmode = RREG32(MGAREG_OPMODE); + + opmode &= ~(GENMASK(17, 16) | GENMASK(9, 8) | GENMASK(3, 2)); + + /* Big-endian byte-swapping */ + switch (format) { + case DRM_FORMAT_RGB565: + opmode |= 0x10100; + break; + case DRM_FORMAT_XRGB8888: + opmode |= 0x20200; + break; + } + WREG32(MGAREG_OPMODE, opmode); +#endif +} + void mgag200_init_registers(struct mga_device *mdev) { u8 crtc11, misc; @@ -506,6 +530,7 @@ void mgag200_primary_plane_helper_atomic if (!fb) return; + mgag200_set_datasiz(mdev, fb->format->format); drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state); drm_atomic_for_each_plane_damage(&iter, &damage) { mgag200_handle_damage(mdev, shadow_plane_state->data, fb, &damage);