From patchwork Sun Feb 16 15:58:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 11385695 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BF4D5109A for ; Mon, 17 Feb 2020 08:21:52 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9DC4C2067D for ; Mon, 17 Feb 2020 08:21:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=crapouillou.net header.i=@crapouillou.net header.b="tUeA1wGJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9DC4C2067D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=crapouillou.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id EE3646E8C3; Mon, 17 Feb 2020 08:20:57 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from crapouillou.net (outils.crapouillou.net [89.234.176.41]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0577489996 for ; Sun, 16 Feb 2020 15:58:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1581868710; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:references; bh=2zq/wwIxPTj/fKmDjIa6URfrDJL7kUowjKmyTJvEAZM=; b=tUeA1wGJAoaGDx/wPduGvxu9AvFh6kk8l5/E2DBUvxCagu9aLiYn7V4w4Yftkl4XMpBfXc MI3bOAfWMlxIeV0NLH4o+djng3P5+9j9aa0LaOslJ72b6RsKojtO4TqD6IrcnCciRWXYSy pLIe+MyXm4OmkmEORcRnKA/w+3XUdXk= From: Paul Cercueil To: David Airlie , Daniel Vetter Subject: [PATCH 1/3] gpu/drm: ingenic: Add trick to support 16bpp on 24-bit panels Date: Sun, 16 Feb 2020 12:58:09 -0300 Message-Id: <20200216155811.68463-1-paul@crapouillou.net> MIME-Version: 1.0 X-Mailman-Approved-At: Mon, 17 Feb 2020 08:20:47 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Cercueil , od@zcrc.me, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" If the panel interface is 24-bit but our primary plane is 16bpp, configure as if the panel was 18-bit. This tricks permits the display of 16bpp data on a 24-bit panel by wiring each color component to the MSBs of the 24-bit interface. Signed-off-by: Paul Cercueil --- drivers/gpu/drm/ingenic/ingenic-drm.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c index 6d47ef7b148c..034961a40e98 100644 --- a/drivers/gpu/drm/ingenic/ingenic-drm.c +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c @@ -400,6 +400,8 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode = &crtc_state->adjusted_mode; struct drm_connector *conn = conn_state->connector; struct drm_display_info *info = &conn->display_info; + struct drm_plane_state *plane_state = crtc_state->crtc->primary->state; + const struct drm_format_info *finfo = NULL; unsigned int cfg; priv->panel_is_sharp = info->bus_flags & DRM_BUS_FLAG_SHARP_SIGNALS; @@ -435,7 +437,22 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder, cfg |= JZ_LCD_CFG_MODE_GENERIC_18BIT; break; case MEDIA_BUS_FMT_RGB888_1X24: - cfg |= JZ_LCD_CFG_MODE_GENERIC_24BIT; + if (plane_state && plane_state->fb) + finfo = plane_state->fb->format; + + /* + * If the panel interface is 24-bit but our + * primary plane is 16bpp, configure as if the + * panel was 18-bit. This tricks permits the + * display of 16bpp data on a 24-bit panel by + * wiring each color component to the MSBs of + * the 24-bit interface. + */ + if (finfo && + finfo->format != DRM_FORMAT_XRGB8888) + cfg |= JZ_LCD_CFG_MODE_GENERIC_18BIT; + else + cfg |= JZ_LCD_CFG_MODE_GENERIC_24BIT; break; case MEDIA_BUS_FMT_RGB888_3X8: cfg |= JZ_LCD_CFG_MODE_8BIT_SERIAL;