[PATCH] drm/mediatek: fixup error memory reallocation

CK Hu ck.hu at mediatek.com
Tue Jun 13 18:19:49 PDT 2017


On Mon, 2017-06-12 at 15:15 +0800, YT Shen wrote:
> Previous patch (c5f228ef6c drm/mediatek: add *driver_data for different
> hardware settings) calls devm_kfree() and then devm_kzalloc() to
> reallocate color module data structure.  But this reallocation cannnot
> guarantee the new address is unchanged, but the caller will use the
> old address, which is wrong.
> 
> Fix it by separate color module from general components, this patch
> separate color module to independent files, like mtk_disp_ovl.c and
> mtk_disp_rdma.c do
> 

Hi, YT:

I would like the title to be something like 'separate color module to
fixup error memory reallocation' because this is a large modification
and its major is separating color module.

Regards,
CK

> Signed-off-by: YT Shen <yt.shen at mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/Makefile           |   3 +-
>  drivers/gpu/drm/mediatek/mtk_disp_color.c   | 176 ++++++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c |  80 +------------
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c      |   6 +-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h      |   1 +
>  5 files changed, 185 insertions(+), 81 deletions(-)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_color.c
> 
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index bf2e5be..e37b55a 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -1,4 +1,5 @@
> -mediatek-drm-y := mtk_disp_ovl.o \
> +mediatek-drm-y := mtk_disp_color.o \
> +		  mtk_disp_ovl.o \
>  		  mtk_disp_rdma.o \
>  		  mtk_drm_crtc.o \
>  		  mtk_drm_ddp.o \
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_color.c b/drivers/gpu/drm/mediatek/mtk_disp_color.c
> new file mode 100644
> index 0000000..ef79a6d
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_color.c
> @@ -0,0 +1,176 @@
> +/*
> + * Copyright (c) 2017 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp_comp.h"
> +
> +#define DISP_COLOR_CFG_MAIN			0x0400
> +#define DISP_COLOR_START_MT2701			0x0f00
> +#define DISP_COLOR_START_MT8173			0x0c00
> +#define DISP_COLOR_START(comp)			((comp)->data->color_offset)
> +#define DISP_COLOR_WIDTH(comp)			(DISP_COLOR_START(comp) + 0x50)
> +#define DISP_COLOR_HEIGHT(comp)			(DISP_COLOR_START(comp) + 0x54)
> +
> +#define COLOR_BYPASS_ALL			BIT(7)
> +#define COLOR_SEQ_SEL				BIT(13)
> +
> +struct mtk_disp_color_data {
> +	unsigned int color_offset;
> +};
> +
> +/**
> + * struct mtk_disp_color - DISP_COLOR driver structure
> + * @ddp_comp - structure containing type enum and hardware resources
> + * @crtc - associated crtc to report irq events to
> + */
> +struct mtk_disp_color {
> +	struct mtk_ddp_comp			ddp_comp;
> +	struct drm_crtc				*crtc;
> +	const struct mtk_disp_color_data	*data;
> +};
> +
> +static inline struct mtk_disp_color *comp_to_color(struct mtk_ddp_comp *comp)
> +{
> +	return container_of(comp, struct mtk_disp_color, ddp_comp);
> +}
> +
> +static void mtk_color_config(struct mtk_ddp_comp *comp, unsigned int w,
> +			     unsigned int h, unsigned int vrefresh,
> +			     unsigned int bpc)
> +{
> +	struct mtk_disp_color *color = comp_to_color(comp);
> +
> +	writel(w, comp->regs + DISP_COLOR_WIDTH(color));
> +	writel(h, comp->regs + DISP_COLOR_HEIGHT(color));
> +}
> +
> +static void mtk_color_start(struct mtk_ddp_comp *comp)
> +{
> +	struct mtk_disp_color *color = comp_to_color(comp);
> +
> +	writel(COLOR_BYPASS_ALL | COLOR_SEQ_SEL,
> +	       comp->regs + DISP_COLOR_CFG_MAIN);
> +	writel(0x1, comp->regs + DISP_COLOR_START(color));
> +}
> +
> +static const struct mtk_ddp_comp_funcs mtk_disp_color_funcs = {
> +	.config = mtk_color_config,
> +	.start = mtk_color_start,
> +};
> +
> +static int mtk_disp_color_bind(struct device *dev, struct device *master,
> +			       void *data)
> +{
> +	struct mtk_disp_color *priv = dev_get_drvdata(dev);
> +	struct drm_device *drm_dev = data;
> +	int ret;
> +
> +	ret = mtk_ddp_comp_register(drm_dev, &priv->ddp_comp);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to register component %s: %d\n",
> +			dev->of_node->full_name, ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void mtk_disp_color_unbind(struct device *dev, struct device *master,
> +				  void *data)
> +{
> +	struct mtk_disp_color *priv = dev_get_drvdata(dev);
> +	struct drm_device *drm_dev = data;
> +
> +	mtk_ddp_comp_unregister(drm_dev, &priv->ddp_comp);
> +}
> +
> +static const struct component_ops mtk_disp_color_component_ops = {
> +	.bind	= mtk_disp_color_bind,
> +	.unbind = mtk_disp_color_unbind,
> +};
> +
> +static int mtk_disp_color_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct mtk_disp_color *priv;
> +	int comp_id;
> +	int ret;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DISP_COLOR);
> +	if (comp_id < 0) {
> +		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
> +		return comp_id;
> +	}
> +
> +	ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
> +				&mtk_disp_color_funcs);
> +	if (ret) {
> +		dev_err(dev, "Failed to initialize component: %d\n", ret);
> +		return ret;
> +	}
> +
> +	priv->data = of_device_get_match_data(dev);
> +
> +	platform_set_drvdata(pdev, priv);
> +
> +	ret = component_add(dev, &mtk_disp_color_component_ops);
> +	if (ret)
> +		dev_err(dev, "Failed to add component: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int mtk_disp_color_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &mtk_disp_color_component_ops);
> +
> +	return 0;
> +}
> +
> +static const struct mtk_disp_color_data mt2701_color_driver_data = {
> +	.color_offset = DISP_COLOR_START_MT2701,
> +};
> +
> +static const struct mtk_disp_color_data mt8173_color_driver_data = {
> +	.color_offset = DISP_COLOR_START_MT8173,
> +};
> +
> +static const struct of_device_id mtk_disp_color_driver_dt_match[] = {
> +	{ .compatible = "mediatek,mt2701-disp-color",
> +	  .data = &mt2701_color_driver_data},
> +	{ .compatible = "mediatek,mt8173-disp-color",
> +	  .data = &mt8173_color_driver_data},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, mtk_disp_color_driver_dt_match);
> +
> +struct platform_driver mtk_disp_color_driver = {
> +	.probe		= mtk_disp_color_probe,
> +	.remove		= mtk_disp_color_remove,
> +	.driver		= {
> +		.name	= "mediatek-disp-color",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = mtk_disp_color_driver_dt_match,
> +	},
> +};
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 8b52416..07d7ea2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -38,13 +38,6 @@
>  
>  #define DISP_REG_UFO_START			0x0000
>  
> -#define DISP_COLOR_CFG_MAIN			0x0400
> -#define DISP_COLOR_START_MT2701			0x0f00
> -#define DISP_COLOR_START_MT8173			0x0c00
> -#define DISP_COLOR_START(comp)			((comp)->data->color_offset)
> -#define DISP_COLOR_WIDTH(comp)			(DISP_COLOR_START(comp) + 0x50)
> -#define DISP_COLOR_HEIGHT(comp)			(DISP_COLOR_START(comp) + 0x54)
> -
>  #define DISP_AAL_EN				0x0000
>  #define DISP_AAL_SIZE				0x0030
>  
> @@ -55,9 +48,6 @@
>  
>  #define LUT_10BIT_MASK				0x03ff
>  
> -#define COLOR_BYPASS_ALL			BIT(7)
> -#define COLOR_SEQ_SEL				BIT(13)
> -
>  #define OD_RELAYMODE				BIT(0)
>  
>  #define UFO_BYPASS				BIT(2)
> @@ -82,20 +72,6 @@
>  #define DITHER_ADD_LSHIFT_G(x)			(((x) & 0x7) << 4)
>  #define DITHER_ADD_RSHIFT_G(x)			(((x) & 0x7) << 0)
>  
> -struct mtk_disp_color_data {
> -	unsigned int color_offset;
> -};
> -
> -struct mtk_disp_color {
> -	struct mtk_ddp_comp			ddp_comp;
> -	const struct mtk_disp_color_data	*data;
> -};
> -
> -static inline struct mtk_disp_color *comp_to_color(struct mtk_ddp_comp *comp)
> -{
> -	return container_of(comp, struct mtk_disp_color, ddp_comp);
> -}
> -
>  void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc,
>  		    unsigned int CFG)
>  {
> @@ -119,25 +95,6 @@ void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc,
>  	}
>  }
>  
> -static void mtk_color_config(struct mtk_ddp_comp *comp, unsigned int w,
> -			     unsigned int h, unsigned int vrefresh,
> -			     unsigned int bpc)
> -{
> -	struct mtk_disp_color *color = comp_to_color(comp);
> -
> -	writel(w, comp->regs + DISP_COLOR_WIDTH(color));
> -	writel(h, comp->regs + DISP_COLOR_HEIGHT(color));
> -}
> -
> -static void mtk_color_start(struct mtk_ddp_comp *comp)
> -{
> -	struct mtk_disp_color *color = comp_to_color(comp);
> -
> -	writel(COLOR_BYPASS_ALL | COLOR_SEQ_SEL,
> -	       comp->regs + DISP_COLOR_CFG_MAIN);
> -	writel(0x1, comp->regs + DISP_COLOR_START(color));
> -}
> -
>  static void mtk_od_config(struct mtk_ddp_comp *comp, unsigned int w,
>  			  unsigned int h, unsigned int vrefresh,
>  			  unsigned int bpc)
> @@ -229,11 +186,6 @@ static void mtk_gamma_set(struct mtk_ddp_comp *comp,
>  	.stop = mtk_gamma_stop,
>  };
>  
> -static const struct mtk_ddp_comp_funcs ddp_color = {
> -	.config = mtk_color_config,
> -	.start = mtk_color_start,
> -};
> -
>  static const struct mtk_ddp_comp_funcs ddp_od = {
>  	.config = mtk_od_config,
>  	.start = mtk_od_start,
> @@ -268,8 +220,8 @@ struct mtk_ddp_comp_match {
>  static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
>  	[DDP_COMPONENT_AAL]	= { MTK_DISP_AAL,	0, &ddp_aal },
>  	[DDP_COMPONENT_BLS]	= { MTK_DISP_BLS,	0, NULL },
> -	[DDP_COMPONENT_COLOR0]	= { MTK_DISP_COLOR,	0, &ddp_color },
> -	[DDP_COMPONENT_COLOR1]	= { MTK_DISP_COLOR,	1, &ddp_color },
> +	[DDP_COMPONENT_COLOR0]	= { MTK_DISP_COLOR,	0, NULL },
> +	[DDP_COMPONENT_COLOR1]	= { MTK_DISP_COLOR,	1, NULL },
>  	[DDP_COMPONENT_DPI0]	= { MTK_DPI,		0, NULL },
>  	[DDP_COMPONENT_DSI0]	= { MTK_DSI,		0, NULL },
>  	[DDP_COMPONENT_DSI1]	= { MTK_DSI,		1, NULL },
> @@ -286,22 +238,6 @@ struct mtk_ddp_comp_match {
>  	[DDP_COMPONENT_WDMA1]	= { MTK_DISP_WDMA,	1, NULL },
>  };
>  
> -static const struct mtk_disp_color_data mt2701_color_driver_data = {
> -	.color_offset = DISP_COLOR_START_MT2701,
> -};
> -
> -static const struct mtk_disp_color_data mt8173_color_driver_data = {
> -	.color_offset = DISP_COLOR_START_MT8173,
> -};
> -
> -static const struct of_device_id mtk_disp_color_driver_dt_match[] = {
> -	{ .compatible = "mediatek,mt2701-disp-color",
> -	  .data = &mt2701_color_driver_data},
> -	{ .compatible = "mediatek,mt8173-disp-color",
> -	  .data = &mt8173_color_driver_data},
> -	{},
> -};
> -
>  int mtk_ddp_comp_get_id(struct device_node *node,
>  			enum mtk_ddp_comp_type comp_type)
>  {
> @@ -324,23 +260,11 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
>  	enum mtk_ddp_comp_type type;
>  	struct device_node *larb_node;
>  	struct platform_device *larb_pdev;
> -	const struct of_device_id *match;
> -	struct mtk_disp_color *color;
>  
>  	if (comp_id < 0 || comp_id >= DDP_COMPONENT_ID_MAX)
>  		return -EINVAL;
>  
>  	type = mtk_ddp_matches[comp_id].type;
> -	if (type == MTK_DISP_COLOR) {
> -		devm_kfree(dev, comp);
> -		color = devm_kzalloc(dev, sizeof(*color), GFP_KERNEL);
> -		if (!color)
> -			return -ENOMEM;
> -
> -		match = of_match_node(mtk_disp_color_driver_dt_match, node);
> -		color->data = match->data;
> -		comp = &color->ddp_comp;
> -	}
>  
>  	comp->id = comp_id;
>  	comp->funcs = funcs ?: mtk_ddp_matches[comp_id].funcs;
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index f6c8ec4..9287fba 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -439,11 +439,12 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  		private->comp_node[comp_id] = of_node_get(node);
>  
>  		/*
> -		 * Currently only the OVL, RDMA, DSI, and DPI blocks have
> +		 * Currently only the COLOR, OVL, RDMA, DSI, and DPI blocks have
>  		 * separate component platform drivers and initialize their own
>  		 * DDP component structure. The others are initialized here.
>  		 */
> -		if (comp_type == MTK_DISP_OVL ||
> +		if (comp_type == MTK_DISP_COLOR ||
> +		    comp_type == MTK_DISP_OVL ||
>  		    comp_type == MTK_DISP_RDMA ||
>  		    comp_type == MTK_DSI ||
>  		    comp_type == MTK_DPI) {
> @@ -566,6 +567,7 @@ static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
>  
>  static struct platform_driver * const mtk_drm_drivers[] = {
>  	&mtk_ddp_driver,
> +	&mtk_disp_color_driver,
>  	&mtk_disp_ovl_driver,
>  	&mtk_disp_rdma_driver,
>  	&mtk_dpi_driver,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index aef8747..c3378c4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -59,6 +59,7 @@ struct mtk_drm_private {
>  };
>  
>  extern struct platform_driver mtk_ddp_driver;
> +extern struct platform_driver mtk_disp_color_driver;
>  extern struct platform_driver mtk_disp_ovl_driver;
>  extern struct platform_driver mtk_disp_rdma_driver;
>  extern struct platform_driver mtk_dpi_driver;





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