From patchwork Fri Jun 2 10:10:08 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen-Yu Tsai X-Patchwork-Id: 9762111 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D3BCC6038E for ; Fri, 2 Jun 2017 10:10:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D37B028323 for ; Fri, 2 Jun 2017 10:10:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C866A2856F; Fri, 2 Jun 2017 10:10:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 65EEF28565 for ; Fri, 2 Jun 2017 10:10:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751275AbdFBKKi (ORCPT ); Fri, 2 Jun 2017 06:10:38 -0400 Received: from mirror2.csie.ntu.edu.tw ([140.112.30.76]:51928 "EHLO wens.csie.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751256AbdFBKKg (ORCPT ); Fri, 2 Jun 2017 06:10:36 -0400 Received: by wens.csie.org (Postfix, from userid 1000) id A50145FE84; Fri, 2 Jun 2017 18:10:32 +0800 (CST) From: Chen-Yu Tsai To: Maxime Ripard , David Airlie , Rob Herring , Michael Turquette , Stephen Boyd Cc: Chen-Yu Tsai , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-sunxi@googlegroups.com Subject: [PATCH 03/19] drm/sun4i: tcon: Add support for demuxing TCON output on A31 Date: Fri, 2 Jun 2017 18:10:08 +0800 Message-Id: <20170602101024.18940-4-wens@csie.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170602101024.18940-1-wens@csie.org> References: <20170602101024.18940-1-wens@csie.org> Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On systems with 2 TCONs such as the A31, it is possible to demux the output of the TCONs to one encoder. Add support for this for the A31. Signed-off-by: Chen-Yu Tsai --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 61 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index d9791292553e..21bd7fab7aaa 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -14,9 +14,12 @@ #include #include #include +#include #include #include +#include + #include #include #include @@ -109,11 +112,69 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable) } EXPORT_SYMBOL(sun4i_tcon_enable_vblank); +static struct sun4i_tcon *sun4i_get_first_tcon(struct drm_device *drm) +{ + struct sun4i_drv *drv = drm->dev_private; + struct sun4i_tcon *tcon; + + list_for_each_entry(tcon, &drv->tcon_list, list) + if (tcon->id == 0) + return tcon; + + dev_warn(drm->dev, + "TCON0 not found, display output muxing may not work\n"); + + return tcon; +} + +static int _sun6i_tcon_set_mux(struct drm_encoder *encoder) +{ + struct sun4i_tcon *tcon = sun4i_get_first_tcon(encoder->dev); + int tcon_id = drm_crtc_to_sun4i_crtc(encoder->crtc)->tcon->id; + u32 shift; + + DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s (TCON %d)\n", + encoder->name, encoder->crtc->name, tcon_id); + + /* Only 2 TCONs */ + if (tcon_id >= 2) + return -EINVAL; + + switch (encoder->encoder_type) { + case DRM_MODE_ENCODER_TMDS: + /* HDMI */ + shift = 8; + break; + case DRM_MODE_ENCODER_DSI: + /* No MIPI DSI on A31s */ + if (of_device_is_compatible(tcon->dev->of_node, + "allwinner,sun6i-a31s-tcon")) + return -EINVAL; + shift = 0; + break; + default: + return -EINVAL; + } + + regmap_update_bits(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, + 0x3 << shift, tcon_id << shift); + + return 0; +} + void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel, struct drm_encoder *encoder) { + /* Get the device node of the display engine */ + struct device_node *node = encoder->dev->dev->of_node; u32 val; + if (of_device_is_compatible(node, "allwinner,sun6i-a31-display-engine") || + of_device_is_compatible(node, "allwinner,sun6i-a31s-display-engine")) { + _sun6i_tcon_set_mux(encoder); + return; + } + if (!tcon->quirks->has_unknown_mux) return;