linux-kernel - [PATCH RFC 4/4] drm/msm/dsi: Add simulated panel support

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Date: Tue, 16 Jan 2024 14:22:07 -0800
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg
	<sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: <quic_abhinavk@...cinc.com>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Subject: [PATCH RFC 4/4] drm/msm/dsi: Add simulated panel support

Introduce the sim_panel_enabled module parameter.

When set, this parameter will force DSI to select the simulated panel
instead of the physical panel.

Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/msm/dsi/dsi.c         | 4 ++++
 drivers/gpu/drm/msm/dsi/dsi_host.c    | 9 ++++++++-
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 8 +++++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index c6bd7bf15605c..daea84f5e3c0c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -5,6 +5,10 @@
 
 #include "dsi.h"
 
+bool sim_panel_enabled;
+MODULE_PARM_DESC(sim_panel_enabled, "Use simulated panel");
+module_param(sim_panel_enabled, bool, 0444);
+
 bool msm_dsi_is_cmd_mode(struct msm_dsi *msm_dsi)
 {
 	unsigned long host_flags = msm_dsi_host_get_mode_flags(msm_dsi->host);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index deeecdfd6c4e4..fa0cab09fff71 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -35,6 +35,8 @@
 
 #define DSI_RESET_TOGGLE_DELAY_MS 20
 
+extern bool sim_panel_enabled;
+
 static int dsi_populate_dsc_params(struct msm_dsi_host *msm_host, struct drm_dsc_config *dsc);
 
 static int dsi_get_version(const void __iomem *base, u32 *major, u32 *minor)
@@ -2009,7 +2011,12 @@ int msm_dsi_host_register(struct mipi_dsi_host *host)
 	if (!msm_host->registered) {
 		host->dev = &msm_host->pdev->dev;
 		host->ops = &dsi_host_ops;
-		ret = mipi_dsi_host_register(host);
+
+		if (sim_panel_enabled)
+			ret = mipi_dsi_host_register_sim_panel(host);
+		else
+			ret = mipi_dsi_host_register(host);
+
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 896f369fdd535..e33e6be7309f2 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -30,6 +30,8 @@ struct msm_dsi_manager {
 
 static struct msm_dsi_manager msm_dsim_glb;
 
+extern bool sim_panel_enabled;
+
 #define IS_BONDED_DSI()		(msm_dsim_glb.is_bonded_dsi)
 #define IS_SYNC_NEEDED()	(msm_dsim_glb.is_sync_needed)
 #define IS_MASTER_DSI_LINK(id)	(msm_dsim_glb.master_dsi_link_id == id)
@@ -507,7 +509,11 @@ int msm_dsi_manager_ext_bridge_init(u8 id)
 	int ret;
 
 	int_bridge = msm_dsi->bridge;
-	ext_bridge = devm_drm_of_get_bridge(&msm_dsi->pdev->dev,
+
+	if (sim_panel_enabled)
+		ext_bridge = drm_get_sim_panel_bridge(&msm_dsi->pdev->dev);
+	else
+		ext_bridge = devm_drm_of_get_bridge(&msm_dsi->pdev->dev,
 					    msm_dsi->pdev->dev.of_node, 1, 0);
 	if (IS_ERR(ext_bridge))
 		return PTR_ERR(ext_bridge);

-- 
2.43.0