[RFC,4/6] drm/bridge/nwl-dsi: Drop mux handling
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Message ID 951688795f969ebcbf9fb3c38065ccce6f488235.1589548223.git.agx@sigxcpu.org
State New
Headers show
Series
  • drm/bridge: Add mux input selection bridge
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Commit Message

Guido Günther May 15, 2020, 1:12 p.m. UTC
This will be handled via the mux-input-bridge.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
---
 drivers/gpu/drm/bridge/Kconfig   |  1 -
 drivers/gpu/drm/bridge/nwl-dsi.c | 61 --------------------------------
 2 files changed, 62 deletions(-)

Comments

Rob Herring May 28, 2020, 7:57 p.m. UTC | #1
On Fri, May 15, 2020 at 03:12:13PM +0200, Guido Günther wrote:
> This will be handled via the mux-input-bridge.

You can't do this. What happens booting a kernel with this change and an 
un-modified dtb? You just broke it.

> 
> Signed-off-by: Guido Günther <agx@sigxcpu.org>
> ---
>  drivers/gpu/drm/bridge/Kconfig   |  1 -
>  drivers/gpu/drm/bridge/nwl-dsi.c | 61 --------------------------------
>  2 files changed, 62 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 3886c0f41bdd..11444f841e35 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -78,7 +78,6 @@ config DRM_NWL_MIPI_DSI
>  	select DRM_PANEL_BRIDGE
>  	select GENERIC_PHY_MIPI_DPHY
>  	select MFD_SYSCON
> -	select MULTIPLEXER
>  	select REGMAP_MMIO
>  	help
>  	  This enables the Northwest Logic MIPI DSI Host controller as
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index b14d725bf609..8839f333f39c 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -12,7 +12,6 @@
>  #include <linux/math64.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/module.h>
> -#include <linux/mux/consumer.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
>  #include <linux/phy/phy.h>
> @@ -44,9 +43,6 @@ enum transfer_direction {
>  	DSI_PACKET_RECEIVE,
>  };
>  
> -#define NWL_DSI_ENDPOINT_LCDIF 0
> -#define NWL_DSI_ENDPOINT_DCSS 1
> -
>  struct nwl_dsi_plat_clk_config {
>  	const char *id;
>  	struct clk *clk;
> @@ -94,7 +90,6 @@ struct nwl_dsi {
>  	struct reset_control *rst_esc;
>  	struct reset_control *rst_dpi;
>  	struct reset_control *rst_pclk;
> -	struct mux_control *mux;
>  
>  	/* DSI clocks */
>  	struct clk *phy_ref_clk;
> @@ -1018,14 +1013,6 @@ static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>  	}
>  	dsi->tx_esc_clk = clk;
>  
> -	dsi->mux = devm_mux_control_get(dsi->dev, NULL);
> -	if (IS_ERR(dsi->mux)) {
> -		ret = PTR_ERR(dsi->mux);
> -		if (ret != -EPROBE_DEFER)
> -			DRM_DEV_ERROR(dsi->dev, "Failed to get mux: %d\n", ret);
> -		return ret;
> -	}
> -
>  	base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(base))
>  		return PTR_ERR(base);
> @@ -1073,47 +1060,6 @@ static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>  	return 0;
>  }
>  
> -static int nwl_dsi_select_input(struct nwl_dsi *dsi)
> -{
> -	struct device_node *remote;
> -	u32 use_dcss = 1;
> -	int ret;
> -
> -	remote = of_graph_get_remote_node(dsi->dev->of_node, 0,
> -					  NWL_DSI_ENDPOINT_LCDIF);
> -	if (remote) {
> -		use_dcss = 0;
> -	} else {
> -		remote = of_graph_get_remote_node(dsi->dev->of_node, 0,
> -						  NWL_DSI_ENDPOINT_DCSS);
> -		if (!remote) {
> -			DRM_DEV_ERROR(dsi->dev,
> -				      "No valid input endpoint found\n");
> -			return -EINVAL;
> -		}
> -	}
> -
> -	DRM_DEV_INFO(dsi->dev, "Using %s as input source\n",
> -		     (use_dcss) ? "DCSS" : "LCDIF");
> -	ret = mux_control_try_select(dsi->mux, use_dcss);
> -	if (ret < 0)
> -		DRM_DEV_ERROR(dsi->dev, "Failed to select input: %d\n", ret);
> -
> -	of_node_put(remote);
> -	return ret;
> -}

You could however make these functions generic for any bridge to use. 
Define a function that checks for mux-control property and if found sets 
up the mux (IIRC, there's already a concept of a default state). That 
should be callable from somewhere generic too.

Rob

Patch
diff mbox series

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 3886c0f41bdd..11444f841e35 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -78,7 +78,6 @@  config DRM_NWL_MIPI_DSI
 	select DRM_PANEL_BRIDGE
 	select GENERIC_PHY_MIPI_DPHY
 	select MFD_SYSCON
-	select MULTIPLEXER
 	select REGMAP_MMIO
 	help
 	  This enables the Northwest Logic MIPI DSI Host controller as
diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index b14d725bf609..8839f333f39c 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -12,7 +12,6 @@ 
 #include <linux/math64.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
-#include <linux/mux/consumer.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/phy/phy.h>
@@ -44,9 +43,6 @@  enum transfer_direction {
 	DSI_PACKET_RECEIVE,
 };
 
-#define NWL_DSI_ENDPOINT_LCDIF 0
-#define NWL_DSI_ENDPOINT_DCSS 1
-
 struct nwl_dsi_plat_clk_config {
 	const char *id;
 	struct clk *clk;
@@ -94,7 +90,6 @@  struct nwl_dsi {
 	struct reset_control *rst_esc;
 	struct reset_control *rst_dpi;
 	struct reset_control *rst_pclk;
-	struct mux_control *mux;
 
 	/* DSI clocks */
 	struct clk *phy_ref_clk;
@@ -1018,14 +1013,6 @@  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
 	}
 	dsi->tx_esc_clk = clk;
 
-	dsi->mux = devm_mux_control_get(dsi->dev, NULL);
-	if (IS_ERR(dsi->mux)) {
-		ret = PTR_ERR(dsi->mux);
-		if (ret != -EPROBE_DEFER)
-			DRM_DEV_ERROR(dsi->dev, "Failed to get mux: %d\n", ret);
-		return ret;
-	}
-
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
@@ -1073,47 +1060,6 @@  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
 	return 0;
 }
 
-static int nwl_dsi_select_input(struct nwl_dsi *dsi)
-{
-	struct device_node *remote;
-	u32 use_dcss = 1;
-	int ret;
-
-	remote = of_graph_get_remote_node(dsi->dev->of_node, 0,
-					  NWL_DSI_ENDPOINT_LCDIF);
-	if (remote) {
-		use_dcss = 0;
-	} else {
-		remote = of_graph_get_remote_node(dsi->dev->of_node, 0,
-						  NWL_DSI_ENDPOINT_DCSS);
-		if (!remote) {
-			DRM_DEV_ERROR(dsi->dev,
-				      "No valid input endpoint found\n");
-			return -EINVAL;
-		}
-	}
-
-	DRM_DEV_INFO(dsi->dev, "Using %s as input source\n",
-		     (use_dcss) ? "DCSS" : "LCDIF");
-	ret = mux_control_try_select(dsi->mux, use_dcss);
-	if (ret < 0)
-		DRM_DEV_ERROR(dsi->dev, "Failed to select input: %d\n", ret);
-
-	of_node_put(remote);
-	return ret;
-}
-
-static int nwl_dsi_deselect_input(struct nwl_dsi *dsi)
-{
-	int ret;
-
-	ret = mux_control_deselect(dsi->mux);
-	if (ret < 0)
-		DRM_DEV_ERROR(dsi->dev, "Failed to deselect input: %d\n", ret);
-
-	return ret;
-}
-
 static const struct drm_bridge_timings nwl_dsi_timings = {
 	.input_bus_flags = DRM_BUS_FLAG_DE_LOW,
 };
@@ -1175,12 +1121,6 @@  static int nwl_dsi_probe(struct platform_device *pdev)
 	dev_set_drvdata(dev, dsi);
 	pm_runtime_enable(dev);
 
-	ret = nwl_dsi_select_input(dsi);
-	if (ret < 0) {
-		mipi_dsi_host_unregister(&dsi->dsi_host);
-		return ret;
-	}
-
 	drm_bridge_add(&dsi->bridge);
 	return 0;
 }
@@ -1189,7 +1129,6 @@  static int nwl_dsi_remove(struct platform_device *pdev)
 {
 	struct nwl_dsi *dsi = platform_get_drvdata(pdev);
 
-	nwl_dsi_deselect_input(dsi);
 	mipi_dsi_host_unregister(&dsi->dsi_host);
 	drm_bridge_remove(&dsi->bridge);
 	pm_runtime_disable(&pdev->dev);