Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753426AbcD0UYG (ORCPT ); Wed, 27 Apr 2016 16:24:06 -0400 Received: from mail-qk0-f179.google.com ([209.85.220.179]:34644 "EHLO mail-qk0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753261AbcD0UYC (ORCPT ); Wed, 27 Apr 2016 16:24:02 -0400 From: Akshay Bhat To: p.zabel@pengutronix.de Cc: robh+dt@kernel.org, airlied@linux.ie, steve_longerbeam@mentor.com, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Akshay Bhat Subject: [PATCH v3 1/2] drm/imx: imx-ldb: Add DDC support Date: Wed, 27 Apr 2016 16:23:33 -0400 Message-Id: <1461788614-7784-1-git-send-email-akshay.bhat@timesys.com> X-Mailer: git-send-email 2.8.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3282 Lines: 112 From: Steve Longerbeam Add support for reading EDID over Display Data Channel. If no DDC adapter is available, falls back to hardcoded EDID or display-timings node as before. Signed-off-by: Steve Longerbeam Signed-off-by: Akshay Bhat Acked-by: Philipp Zabel --- Hi Philipp, I have addressed all your comments on v2 Patch. Thanks, Akshay v3: Move ddc_node pointer definition Warn and perform a probe deferral on failing to get ddc i2c adapter by node v2: Rebase to 4.6-rc5 Add check for channel->panel before fallback to display-timings node drivers/gpu/drm/imx/imx-ldb.c | 42 ++++++++++++++++++++++++++++++++++-------- 1 file changed, 34 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index a58eee5..f506e8d 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -59,6 +59,7 @@ struct imx_ldb_channel { struct drm_encoder encoder; struct drm_panel *panel; struct device_node *child; + struct i2c_adapter *ddc; int chno; void *edid; int edid_len; @@ -107,6 +108,9 @@ static int imx_ldb_connector_get_modes(struct drm_connector *connector) return num_modes; } + if (!imx_ldb_ch->edid && imx_ldb_ch->ddc) + imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc); + if (imx_ldb_ch->edid) { drm_mode_connector_update_edid_property(connector, imx_ldb_ch->edid); @@ -553,6 +557,7 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) for_each_child_of_node(np, child) { struct imx_ldb_channel *channel; + struct device_node *ddc_node; struct device_node *port; ret = of_property_read_u32(child, "reg", &i); @@ -595,14 +600,34 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) } } - edidp = of_get_property(child, "edid", &channel->edid_len); - if (edidp) { - channel->edid = kmemdup(edidp, channel->edid_len, - GFP_KERNEL); - } else if (!channel->panel) { - ret = of_get_drm_display_mode(child, &channel->mode, 0); - if (!ret) - channel->mode_valid = 1; + ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0); + if (ddc_node) { + channel->ddc = of_find_i2c_adapter_by_node(ddc_node); + of_node_put(ddc_node); + if (!channel->ddc) { + dev_warn(dev, "failed to get ddc i2c adapter\n"); + return -EPROBE_DEFER; + } + } + + if (!channel->ddc) { + /* if no DDC available, fallback to hardcoded EDID */ + dev_dbg(dev, "no ddc available\n"); + + edidp = of_get_property(child, "edid", + &channel->edid_len); + if (edidp) { + channel->edid = kmemdup(edidp, + channel->edid_len, + GFP_KERNEL); + } else if (!channel->panel) { + /* fallback to display-timings node */ + ret = of_get_drm_display_mode(child, + &channel->mode, + 0); + if (!ret) + channel->mode_valid = 1; + } } channel->bus_format = of_get_bus_format(dev, child); @@ -647,6 +672,7 @@ static void imx_ldb_unbind(struct device *dev, struct device *master, channel->encoder.funcs->destroy(&channel->encoder); kfree(channel->edid); + i2c_put_adapter(channel->ddc); } } -- 2.8.1