From 9e1305d0d1fd8f1b47203eac4fb3eb05d64a5ffd Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sat, 5 Aug 2017 01:43:53 +0300 Subject: [PATCH] drm: omapdrm: dsi: Handle pin muxing internally Don't rely on callback functions provided by the platform, but access the syscon internally to mux the DSI pins. Signed-off-by: Laurent Pinchart Reviewed-by: Tomi Valkeinen Signed-off-by: Tomi Valkeinen --- drivers/gpu/drm/omapdrm/dss/core.c | 20 -------- drivers/gpu/drm/omapdrm/dss/dsi.c | 82 ++++++++++++++++++++++++++++-- drivers/gpu/drm/omapdrm/dss/dss.h | 2 - 3 files changed, 79 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/dss/core.c b/drivers/gpu/drm/omapdrm/dss/core.c index bdce4bfdf6e0..a6baa0a0a973 100644 --- a/drivers/gpu/drm/omapdrm/dss/core.c +++ b/drivers/gpu/drm/omapdrm/dss/core.c @@ -50,26 +50,6 @@ enum omapdss_version omapdss_get_version(void) } EXPORT_SYMBOL(omapdss_get_version); -int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask) -{ - struct omap_dss_board_info *board_data = core.pdev->dev.platform_data; - - if (!board_data->dsi_enable_pads) - return -ENOENT; - - return board_data->dsi_enable_pads(dsi_id, lane_mask); -} - -void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask) -{ - struct omap_dss_board_info *board_data = core.pdev->dev.platform_data; - - if (!board_data->dsi_disable_pads) - return; - - return board_data->dsi_disable_pads(dsi_id, lane_mask); -} - int dss_set_min_bus_tput(struct device *dev, unsigned long tput) { struct omap_dss_board_info *pdata = core.pdev->dev.platform_data; diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c index 59e099f9e49d..3d98e9ce9a43 100644 --- a/drivers/gpu/drm/omapdrm/dss/dsi.c +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c @@ -20,6 +20,8 @@ #define DSS_SUBSYS_NAME "DSI" #include +#include +#include #include #include #include @@ -330,6 +332,7 @@ struct dsi_data { bool is_enabled; struct clk *dss_clk; + struct regmap *syscon; struct dispc_clock_info user_dispc_cinfo; struct dss_pll_clock_info user_dsi_cinfo; @@ -2073,6 +2076,64 @@ static unsigned dsi_get_lane_mask(struct platform_device *dsidev) return mask; } +/* OMAP4 CONTROL_DSIPHY */ +#define OMAP4_DSIPHY_SYSCON_OFFSET 0x78 + +#define OMAP4_DSI2_LANEENABLE_SHIFT 29 +#define OMAP4_DSI2_LANEENABLE_MASK (0x7 << 29) +#define OMAP4_DSI1_LANEENABLE_SHIFT 24 +#define OMAP4_DSI1_LANEENABLE_MASK (0x1f << 24) +#define OMAP4_DSI1_PIPD_SHIFT 19 +#define OMAP4_DSI1_PIPD_MASK (0x1f << 19) +#define OMAP4_DSI2_PIPD_SHIFT 14 +#define OMAP4_DSI2_PIPD_MASK (0x1f << 14) + +static int dsi_omap4_mux_pads(struct dsi_data *dsi, unsigned int lanes) +{ + u32 enable_mask, enable_shift; + u32 pipd_mask, pipd_shift; + u32 reg; + + if (!dsi->syscon) + return 0; + + if (dsi->module_id == 0) { + enable_mask = OMAP4_DSI1_LANEENABLE_MASK; + enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT; + pipd_mask = OMAP4_DSI1_PIPD_MASK; + pipd_shift = OMAP4_DSI1_PIPD_SHIFT; + } else if (dsi->module_id == 1) { + enable_mask = OMAP4_DSI2_LANEENABLE_MASK; + enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT; + pipd_mask = OMAP4_DSI2_PIPD_MASK; + pipd_shift = OMAP4_DSI2_PIPD_SHIFT; + } else { + return -ENODEV; + } + + regmap_read(dsi->syscon, OMAP4_DSIPHY_SYSCON_OFFSET, ®); + + reg &= ~enable_mask; + reg &= ~pipd_mask; + + reg |= (lanes << enable_shift) & enable_mask; + reg |= (lanes << pipd_shift) & pipd_mask; + + regmap_write(dsi->syscon, OMAP4_DSIPHY_SYSCON_OFFSET, reg); + + return 0; +} + +static int dsi_enable_pads(struct dsi_data *dsi, unsigned int lane_mask) +{ + return dsi_omap4_mux_pads(dsi, lane_mask); +} + +static void dsi_disable_pads(struct dsi_data *dsi) +{ + dsi_omap4_mux_pads(dsi, 0); +} + static int dsi_cio_init(struct platform_device *dsidev) { struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); @@ -2081,7 +2142,7 @@ static int dsi_cio_init(struct platform_device *dsidev) DSSDBG("DSI CIO init starts"); - r = dss_dsi_enable_pads(dsi->module_id, dsi_get_lane_mask(dsidev)); + r = dsi_enable_pads(dsi, dsi_get_lane_mask(dsidev)); if (r) return r; @@ -2191,7 +2252,7 @@ err_cio_pwr: dsi_cio_disable_lane_override(dsidev); err_scp_clk_dom: dsi_disable_scp_clk(dsidev); - dss_dsi_disable_pads(dsi->module_id, dsi_get_lane_mask(dsidev)); + dsi_disable_pads(dsi); return r; } @@ -2204,7 +2265,7 @@ static void dsi_cio_uninit(struct platform_device *dsidev) dsi_cio_power(dsidev, DSI_COMPLEXIO_POWER_OFF); dsi_disable_scp_clk(dsidev); - dss_dsi_disable_pads(dsi->module_id, dsi_get_lane_mask(dsidev)); + dsi_disable_pads(dsi); } static void dsi_config_tx_fifo(struct platform_device *dsidev, @@ -5332,6 +5393,21 @@ static int dsi_bind(struct device *dev, struct device *master, void *data) dsi->module_id = d->id; + if (dsi->data->model == DSI_MODEL_OMAP4) { + struct device_node *np; + + /* + * The OMAP4 display DT bindings don't reference the padconf + * syscon. Our only option to retrieve it is to find it by name. + */ + np = of_find_node_by_name(NULL, "omap4_padconf_global"); + if (!np) + return -ENODEV; + + dsi->syscon = syscon_node_to_regmap(np); + of_node_put(np); + } + /* DSI VCs initialization */ for (i = 0; i < ARRAY_SIZE(dsi->vc); i++) { dsi->vc[i].source = DSI_VC_SOURCE_L4; diff --git a/drivers/gpu/drm/omapdrm/dss/dss.h b/drivers/gpu/drm/omapdrm/dss/dss.h index 8dbf35f3ab23..668ff93512db 100644 --- a/drivers/gpu/drm/omapdrm/dss/dss.h +++ b/drivers/gpu/drm/omapdrm/dss/dss.h @@ -219,8 +219,6 @@ struct seq_file; struct platform_device; /* core */ -int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask); -void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask); int dss_set_min_bus_tput(struct device *dev, unsigned long tput); int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *)); -- 2.20.1