[PATCH 3/3] drm: pl111: Move VExpress setup into versatile init
Sam Ravnborg
sam at ravnborg.org
Thu Apr 9 14:34:48 UTC 2020
Hi Rob.
On Wed, Apr 08, 2020 at 07:39:47PM -0600, Rob Herring wrote:
> Since the VExpress setup in pl111_vexpress.c is now just a single
> function call, let's move it into pl111_versatile.c and we can further
> simplify pl111_versatile_init() by moving the other pieces for VExpress
> into pl111_vexpress_clcd_init().
>
> Cc: Eric Anholt <eric at anholt.net>
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Rob Herring <robh at kernel.org>
Patch looks good - nits below, but anyway:
Acked-by: Sam Ravnborg <sam at ravnborg.org>
> ---
> drivers/gpu/drm/pl111/Makefile | 1 -
> drivers/gpu/drm/pl111/pl111_versatile.c | 122 ++++++++++++++++++++----
> drivers/gpu/drm/pl111/pl111_vexpress.c | 96 -------------------
> drivers/gpu/drm/pl111/pl111_vexpress.h | 22 -----
> 4 files changed, 102 insertions(+), 139 deletions(-)
> delete mode 100644 drivers/gpu/drm/pl111/pl111_vexpress.c
> delete mode 100644 drivers/gpu/drm/pl111/pl111_vexpress.h
>
> diff --git a/drivers/gpu/drm/pl111/Makefile b/drivers/gpu/drm/pl111/Makefile
> index 0c70f0e91d21..67d430d433e0 100644
> --- a/drivers/gpu/drm/pl111/Makefile
> +++ b/drivers/gpu/drm/pl111/Makefile
> @@ -3,7 +3,6 @@ pl111_drm-y += pl111_display.o \
> pl111_versatile.o \
> pl111_drv.o
>
> -pl111_drm-$(CONFIG_ARCH_VEXPRESS) += pl111_vexpress.o
> pl111_drm-$(CONFIG_ARCH_NOMADIK) += pl111_nomadik.o
> pl111_drm-$(CONFIG_DEBUG_FS) += pl111_debugfs.o
>
> diff --git a/drivers/gpu/drm/pl111/pl111_versatile.c b/drivers/gpu/drm/pl111/pl111_versatile.c
> index 8c2551088f26..1b55f977e945 100644
> --- a/drivers/gpu/drm/pl111/pl111_versatile.c
> +++ b/drivers/gpu/drm/pl111/pl111_versatile.c
> @@ -11,7 +11,6 @@
> #include <linux/vexpress.h>
>
> #include "pl111_versatile.h"
> -#include "pl111_vexpress.h"
> #include "pl111_drm.h"
>
> static struct regmap *versatile_syscon_map;
> @@ -309,13 +308,110 @@ static const struct pl111_variant_data pl111_vexpress = {
> .broken_clockdivider = true,
> };
>
> +#define VEXPRESS_FPGAMUX_MOTHERBOARD 0x00
> +#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_1 0x01
> +#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_2 0x02
> +
> +static int pl111_vexpress_clcd_init(struct device *dev, struct device_node *np,
> + struct pl111_drm_dev_private *priv)
> +{
> + struct platform_device *pdev;
> + struct device_node *root;
> + struct device_node *child;
> + struct device_node *ct_clcd = NULL;
> + struct regmap *map;
> + bool has_coretile_clcd = false;
> + bool has_coretile_hdlcd = false;
> + bool mux_motherboard = true;
> + u32 val;
> + int ret;
> +
> + if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG))
> + return -ENODEV;
Thats was a simple way to get out of this.
Maybe a WARN() was in place, because should we ever hit this?
> +
> + /*
> + * Check if we have a CLCD or HDLCD on the core tile by checking if a
> + * CLCD or HDLCD is available in the root of the device tree.
> + */
> + root = of_find_node_by_path("/");
> + if (!root)
> + return -EINVAL;
> +
> + for_each_available_child_of_node(root, child) {
> + if (of_device_is_compatible(child, "arm,pl111")) {
> + has_coretile_clcd = true;
> + ct_clcd = child;
> + break;
> + }
> + if (of_device_is_compatible(child, "arm,hdlcd")) {
> + has_coretile_hdlcd = true;
> + of_node_put(child);
> + break;
> + }
> + }
> +
> + of_node_put(root);
> +
> + /*
> + * If there is a coretile HDLCD and it has a driver,
> + * do not mux the CLCD on the motherboard to the DVI.
> + */
> + if (has_coretile_hdlcd && IS_ENABLED(CONFIG_DRM_HDLCD))
> + mux_motherboard = false;
> +
> + /*
> + * On the Vexpress CA9 we let the CLCD on the coretile
> + * take precedence, so also in this case do not mux the
> + * motherboard to the DVI.
> + */
> + if (has_coretile_clcd)
> + mux_motherboard = false;
> +
> + if (mux_motherboard) {
> + dev_info(dev, "DVI muxed to motherboard CLCD\n");
> + val = VEXPRESS_FPGAMUX_MOTHERBOARD;
> + } else if (ct_clcd == dev->of_node) {
> + dev_info(dev,
> + "DVI muxed to daughterboard 1 (core tile) CLCD\n");
> + val = VEXPRESS_FPGAMUX_DAUGHTERBOARD_1;
> + } else {
> + dev_info(dev, "core tile graphics present\n");
> + dev_info(dev, "this device will be deactivated\n");
> + return -ENODEV;
> + }
> +
> + /* Call into deep Vexpress configuration API */
> + pdev = of_find_device_by_node(np);
> + if (!pdev) {
> + dev_err(dev, "can't find the sysreg device, deferring\n");
> + return -EPROBE_DEFER;
> + }
> +
> + map = devm_regmap_init_vexpress_config(&pdev->dev);
> + if (IS_ERR(map)) {
> + platform_device_put(pdev);
> + return PTR_ERR(map);
> + }
> +
> + ret = regmap_write(map, 0, val);
> + platform_device_put(pdev);
> + if (ret) {
> + dev_err(dev, "error setting DVI muxmode\n");
> + return -ENODEV;
> + }
> +
> + priv->variant = &pl111_vexpress;
> + dev_info(dev, "initializing Versatile Express PL111\n");
> +
> + return 0;
> +}
> +
> int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
> {
> const struct of_device_id *clcd_id;
> enum versatile_clcd versatile_clcd_type;
> struct device_node *np;
> struct regmap *map;
> - int ret;
>
> np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
> &clcd_id);
> @@ -326,17 +422,10 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
> versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
>
> /* Versatile Express special handling */
> - if (IS_ENABLED(CONFIG_VEXPRESS_CONFIG) && versatile_clcd_type == VEXPRESS_CLCD_V2M) {
> - struct platform_device *pdev;
> - /* Call into deep Vexpress configuration API */
> - pdev = of_find_device_by_node(np);
> - if (!pdev) {
> - dev_err(dev, "can't find the sysreg device, deferring\n");
> - of_node_put(np);
> - return -EPROBE_DEFER;
> - }
> - map = devm_regmap_init_vexpress_config(&pdev->dev);
> - platform_device_put(pdev);
> + if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
> + int ret = pl111_vexpress_clcd_init(dev, np, priv);
> + of_node_put(np);
> + return ret;
It is often in error situations one return early, but in this case it is
a normal case. Maybe a small comment?
> } else {
> map = syscon_node_to_regmap(np);
> }
> @@ -380,13 +469,6 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
> priv->variant_display_disable = pl111_realview_clcd_disable;
> dev_info(dev, "set up callbacks for RealView PL111\n");
> break;
> - case VEXPRESS_CLCD_V2M:
> - priv->variant = &pl111_vexpress;
> - dev_info(dev, "initializing Versatile Express PL111\n");
> - ret = pl111_vexpress_clcd_init(dev, priv, map);
> - if (ret)
> - return ret;
> - break;
The switch no longer includes VEXPRESS_CLCD_V2M - because we will never
reach the switch in this case.
I guess some gcc falgs may cause a warning that not all enums are
accounted for. But then again, the default may supress it.
Anyway, I noticed so you got a comment.
I think current code is fine.
Sam
> default:
> dev_info(dev, "unknown Versatile system controller\n");
> break;
> diff --git a/drivers/gpu/drm/pl111/pl111_vexpress.c b/drivers/gpu/drm/pl111/pl111_vexpress.c
> deleted file mode 100644
> index 37ed3f1da820..000000000000
> --- a/drivers/gpu/drm/pl111/pl111_vexpress.c
> +++ /dev/null
> @@ -1,96 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -/*
> - * Versatile Express PL111 handling
> - * Copyright (C) 2018 Linus Walleij
> - *
> - * This module binds to the "arm,vexpress-muxfpga" device on the
> - * Versatile Express configuration bus and sets up which CLCD instance
> - * gets muxed out on the DVI bridge.
> - */
> -#include <linux/device.h>
> -#include <linux/module.h>
> -#include <linux/regmap.h>
> -#include <linux/vexpress.h>
> -#include <linux/platform_device.h>
> -#include <linux/of.h>
> -#include <linux/of_address.h>
> -#include <linux/of_platform.h>
> -#include "pl111_drm.h"
> -#include "pl111_vexpress.h"
> -
> -#define VEXPRESS_FPGAMUX_MOTHERBOARD 0x00
> -#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_1 0x01
> -#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_2 0x02
> -
> -int pl111_vexpress_clcd_init(struct device *dev,
> - struct pl111_drm_dev_private *priv,
> - struct regmap *map)
> -{
> - struct device_node *root;
> - struct device_node *child;
> - struct device_node *ct_clcd = NULL;
> - bool has_coretile_clcd = false;
> - bool has_coretile_hdlcd = false;
> - bool mux_motherboard = true;
> - u32 val;
> - int ret;
> -
> - /*
> - * Check if we have a CLCD or HDLCD on the core tile by checking if a
> - * CLCD or HDLCD is available in the root of the device tree.
> - */
> - root = of_find_node_by_path("/");
> - if (!root)
> - return -EINVAL;
> -
> - for_each_available_child_of_node(root, child) {
> - if (of_device_is_compatible(child, "arm,pl111")) {
> - has_coretile_clcd = true;
> - ct_clcd = child;
> - break;
> - }
> - if (of_device_is_compatible(child, "arm,hdlcd")) {
> - has_coretile_hdlcd = true;
> - of_node_put(child);
> - break;
> - }
> - }
> -
> - of_node_put(root);
> -
> - /*
> - * If there is a coretile HDLCD and it has a driver,
> - * do not mux the CLCD on the motherboard to the DVI.
> - */
> - if (has_coretile_hdlcd && IS_ENABLED(CONFIG_DRM_HDLCD))
> - mux_motherboard = false;
> -
> - /*
> - * On the Vexpress CA9 we let the CLCD on the coretile
> - * take precedence, so also in this case do not mux the
> - * motherboard to the DVI.
> - */
> - if (has_coretile_clcd)
> - mux_motherboard = false;
> -
> - if (mux_motherboard) {
> - dev_info(dev, "DVI muxed to motherboard CLCD\n");
> - val = VEXPRESS_FPGAMUX_MOTHERBOARD;
> - } else if (ct_clcd == dev->of_node) {
> - dev_info(dev,
> - "DVI muxed to daughterboard 1 (core tile) CLCD\n");
> - val = VEXPRESS_FPGAMUX_DAUGHTERBOARD_1;
> - } else {
> - dev_info(dev, "core tile graphics present\n");
> - dev_info(dev, "this device will be deactivated\n");
> - return -ENODEV;
> - }
> -
> - ret = regmap_write(map, 0, val);
> - if (ret) {
> - dev_err(dev, "error setting DVI muxmode\n");
> - return -ENODEV;
> - }
> -
> - return 0;
> -}
> diff --git a/drivers/gpu/drm/pl111/pl111_vexpress.h b/drivers/gpu/drm/pl111/pl111_vexpress.h
> deleted file mode 100644
> index bb54864ca91e..000000000000
> --- a/drivers/gpu/drm/pl111/pl111_vexpress.h
> +++ /dev/null
> @@ -1,22 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -
> -struct device;
> -struct pl111_drm_dev_private;
> -struct regmap;
> -
> -#ifdef CONFIG_ARCH_VEXPRESS
> -
> -int pl111_vexpress_clcd_init(struct device *dev,
> - struct pl111_drm_dev_private *priv,
> - struct regmap *map);
> -
> -#else
> -
> -static inline int pl111_vexpress_clcd_init(struct device *dev,
> - struct pl111_drm_dev_private *priv,
> - struct regmap *map)
> -{
> - return -ENODEV;
> -}
> -
> -#endif
> --
> 2.20.1
>
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