From 1effe5a3bb3ddf172649e06f7a5607317e077930 Mon Sep 17 00:00:00 2001 From: Matt Redfearn Date: Tue, 30 Apr 2019 08:17:04 +0000 Subject: [PATCH] drm/bridge/synopsys: dsi: Allow VPG to be enabled via debugfs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The Synopsys MIPI DSI IP contains a video test pattern generator which is helpful in debugging video timing with connected displays. Add a debugfs directory containing files which allow the VPG to be enabled and disabled, and its orientation to be changed. Signed-off-by: Matt Redfearn Tested-by: Yannick Fertré Reviewed-by: Philippe Cornu Signed-off-by: Andrzej Hajda Link: https://patchwork.freedesktop.org/patch/msgid/20190430081646.23845-1-matt.redfearn@thinci.com --- drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 47 +++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c index 281c58bab1a1..675442bfc1bd 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -89,6 +90,8 @@ #define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS 0x1 #define VID_MODE_TYPE_BURST 0x2 #define VID_MODE_TYPE_MASK 0x3 +#define VID_MODE_VPG_ENABLE BIT(16) +#define VID_MODE_VPG_HORIZONTAL BIT(24) #define DSI_VID_PKT_SIZE 0x3c #define VID_PKT_SIZE(p) ((p) & 0x3fff) @@ -233,6 +236,13 @@ struct dw_mipi_dsi { u32 format; unsigned long mode_flags; +#ifdef CONFIG_DEBUG_FS + struct dentry *debugfs; + + bool vpg; + bool vpg_horizontal; +#endif /* CONFIG_DEBUG_FS */ + struct dw_mipi_dsi *master; /* dual-dsi master ptr */ struct dw_mipi_dsi *slave; /* dual-dsi slave ptr */ @@ -518,6 +528,13 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi) else val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS; +#ifdef CONFIG_DEBUG_FS + if (dsi->vpg) { + val |= VID_MODE_VPG_ENABLE; + val |= dsi->vpg_horizontal ? VID_MODE_VPG_HORIZONTAL : 0; + } +#endif /* CONFIG_DEBUG_FS */ + dsi_write(dsi, DSI_VID_MODE_CFG, val); } @@ -930,6 +947,33 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = { .attach = dw_mipi_dsi_bridge_attach, }; +#ifdef CONFIG_DEBUG_FS + +static void dw_mipi_dsi_debugfs_init(struct dw_mipi_dsi *dsi) +{ + dsi->debugfs = debugfs_create_dir(dev_name(dsi->dev), NULL); + if (IS_ERR(dsi->debugfs)) { + dev_err(dsi->dev, "failed to create debugfs root\n"); + return; + } + + debugfs_create_bool("vpg", 0660, dsi->debugfs, &dsi->vpg); + debugfs_create_bool("vpg_horizontal", 0660, dsi->debugfs, + &dsi->vpg_horizontal); +} + +static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi) +{ + debugfs_remove_recursive(dsi->debugfs); +} + +#else + +static void dw_mipi_dsi_debugfs_init(struct dw_mipi_dsi *dsi) { } +static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi) { } + +#endif /* CONFIG_DEBUG_FS */ + static struct dw_mipi_dsi * __dw_mipi_dsi_probe(struct platform_device *pdev, const struct dw_mipi_dsi_plat_data *plat_data) @@ -1000,6 +1044,7 @@ __dw_mipi_dsi_probe(struct platform_device *pdev, clk_disable_unprepare(dsi->pclk); } + dw_mipi_dsi_debugfs_init(dsi); pm_runtime_enable(dev); dsi->dsi_host.ops = &dw_mipi_dsi_host_ops; @@ -1007,6 +1052,7 @@ __dw_mipi_dsi_probe(struct platform_device *pdev, ret = mipi_dsi_host_register(&dsi->dsi_host); if (ret) { dev_err(dev, "Failed to register MIPI host: %d\n", ret); + dw_mipi_dsi_debugfs_remove(dsi); return ERR_PTR(ret); } @@ -1024,6 +1070,7 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi) mipi_dsi_host_unregister(&dsi->dsi_host); pm_runtime_disable(dsi->dev); + dw_mipi_dsi_debugfs_remove(dsi); } void dw_mipi_dsi_set_slave(struct dw_mipi_dsi *dsi, struct dw_mipi_dsi *slave) -- 2.30.2