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 EA6AC2DF13B; Tue, 6 Jan 2026 17:40:32 +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=1767721233; cv=none; b=SQUSFP9Ld0L229oeSSYrhp4S6IDpdfXAQBXy47CZDhy8aUiP37gvP8BeEWqLm5ai7YGoFG79i8frDq4abI7o5risuU4OkyX0aAiKvp/62ctH+yoj9XQanE38G0AFoVv9diOCd1MnncoO3HorCnZFU4AbpWWlAe/AfqGfy07Stp8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767721233; c=relaxed/simple; bh=jUx37cv3Qeb04lO6JdMmyZkoRG5/x8I3iwSuTN305ns=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=C5zoNeVAvIgNdVGpOYRHxa+7Z43nR6wY8sbNHXcn65xh2eAE5nBfwXghc8jsn5F7EDwpZAZxEdzgHfdL0YAS7r0AfK7OGhTZXfzSDMHIBfrattesAUR1nVhkd5HtlWI+mFcb98jrRpRDuPbZN9+5Dg10DX72S86Ce/mZBe2RiyI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CYjkCzla; 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="CYjkCzla" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A17FC116C6; Tue, 6 Jan 2026 17:40:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767721232; bh=jUx37cv3Qeb04lO6JdMmyZkoRG5/x8I3iwSuTN305ns=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CYjkCzlaM0EQw40/gaPXGRjV/ES+/TPnnOP/WZaFyc0njg915V/GLFnHZeCNz9FXF KtCjVW9ZI32ep4gybNTlbjW1hgpS+xrgx3bR/OcWVvFzt9rPF1l2gyTv9+8VSyeHgw UxO2GlxQNzWmaHBxejhml4Wlk4a+17CAyl2t7kV0= 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 6.12 475/567] drm/mgag200: Fix big-endian support Date: Tue, 6 Jan 2026 18:04:17 +0100 Message-ID: <20260106170508.924707707@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260106170451.332875001@linuxfoundation.org> References: <20260106170451.332875001@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 6.12-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 @@ -175,6 +175,30 @@ 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; @@ -510,6 +534,7 @@ void mgag200_primary_plane_helper_atomic struct drm_atomic_helper_damage_iter iter; struct drm_rect damage; + 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);