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From:   Javier Martinez Canillas <javierm@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-fbdev@vger.kernel.org, Maxime Ripard <maxime@cerno.tech>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        dri-devel@lists.freedesktop.org,
        =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Javier Martinez Canillas <javierm@redhat.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH 1/4] drm: Add I2C connector type
Date:   Mon, 31 Jan 2022 21:12:21 +0100
Message-Id: <20220131201225.2324984-2-javierm@redhat.com>
In-Reply-To: <20220131201225.2324984-1-javierm@redhat.com>
References: <20220131201225.2324984-1-javierm@redhat.com>
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Precedence: bulk

There isn't a connector type for display controllers accesed through I2C,
most drivers use DRM_MODE_CONNECTOR_Unknown or DRM_MODE_CONNECTOR_VIRTUAL.

Add an I2C connector type to match the actual connector.

As Noralf Trønnes mentions in commit fc06bf1d76d6 ("drm: Add SPI connector
type"), user-space should be able to cope with a connector type that does
not yet understand.

Tested with `modetest -M ssd1307 -c` and shows the connector as unknown-1.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

 drivers/gpu/drm/drm_connector.c | 1 +
 include/uapi/drm/drm_mode.h     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index a50c82bc2b2f..975a7525a508 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -105,6 +105,7 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
 	{ DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" },
 	{ DRM_MODE_CONNECTOR_SPI, "SPI" },
 	{ DRM_MODE_CONNECTOR_USB, "USB" },
+	{ DRM_MODE_CONNECTOR_I2C, "I2C" },
 };
 
 void drm_connector_ida_init(void)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index e1e351682872..d6d6288242db 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -421,6 +421,7 @@ enum drm_mode_subconnector {
 #define DRM_MODE_CONNECTOR_WRITEBACK	18
 #define DRM_MODE_CONNECTOR_SPI		19
 #define DRM_MODE_CONNECTOR_USB		20
+#define DRM_MODE_CONNECTOR_I2C		21
 
 /**
  * struct drm_mode_get_connector - Get connector metadata.
-- 
2.34.1