diff mbox

[1/8] drm/mediatek: Use regmap for register access

Message ID 20171114214114.15793-2-mbrugger@suse.com (mailing list archive)
State New, archived
Headers show

Commit Message

Matthias Brugger Nov. 14, 2017, 9:41 p.m. UTC 
The mmsys memory space is shared between the drm and the
clk driver. Use regmap to access it.

Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  4 ++--
 drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 30 +++++++++++++++++-------------
 drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |  4 ++--
 drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 13 ++++---------
 drivers/gpu/drm/mediatek/mtk_drm_drv.h  |  2 +-
 5 files changed, 26 insertions(+), 27 deletions(-)

Comments

CK Hu (胡俊光) Nov. 23, 2017, 5:44 a.m. UTC | #1 
Hi, Matthias:

On Tue, 2017-11-14 at 22:41 +0100, Matthias Brugger wrote:
> The mmsys memory space is shared between the drm and the
> clk driver. Use regmap to access it.
> 
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>

Acked-by: CK Hu <ck.hu@mediatek.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  4 ++--
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 30 +++++++++++++++++-------------
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |  4 ++--
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 13 ++++---------
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h  |  2 +-
>  5 files changed, 26 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 658b8dd45b83..4c65873b4867 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -33,7 +33,7 @@
>   * @enabled: records whether crtc_enable succeeded
>   * @planes: array of 4 drm_plane structures, one for each overlay plane
>   * @pending_planes: whether any plane has pending changes to be applied
> - * @config_regs: memory mapped mmsys configuration register space
> + * @config_regs: regmap mapped mmsys configuration register space
>   * @mutex: handle to one of the ten disp_mutex streams
>   * @ddp_comp_nr: number of components in ddp_comp
>   * @ddp_comp: array of pointers the mtk_ddp_comp structures used by this crtc
> @@ -48,7 +48,7 @@ struct mtk_drm_crtc {
>  	struct drm_plane		planes[OVL_LAYER_NR];
>  	bool				pending_planes;
>  
> -	void __iomem			*config_regs;
> +	struct regmap			*config_regs;
>  	struct mtk_disp_mutex		*mutex;
>  	unsigned int			ddp_comp_nr;
>  	struct mtk_ddp_comp		**ddp_comp;
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index 8130f3dab661..1227d6db07da 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -185,16 +185,16 @@ static unsigned int mtk_ddp_sel_in(enum mtk_ddp_comp_id cur,
>  	return value;
>  }
>  
> -static void mtk_ddp_sout_sel(void __iomem *config_regs,
> +static void mtk_ddp_sout_sel(struct regmap *config_regs,
>  			     enum mtk_ddp_comp_id cur,
>  			     enum mtk_ddp_comp_id next)
>  {
>  	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0)
> -		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
> -			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> +		regmap_write(config_regs, DISP_REG_CONFIG_OUT_SEL,
> +				BLS_TO_DSI_RDMA1_TO_DPI1);
>  }
>  
> -void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
> +void mtk_ddp_add_comp_to_path(struct regmap *config_regs,
>  			      enum mtk_ddp_comp_id cur,
>  			      enum mtk_ddp_comp_id next)
>  {
> @@ -202,20 +202,22 @@ void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
>  
>  	value = mtk_ddp_mout_en(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) | value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg |= value;
> +		regmap_write(config_regs, addr, reg);
>  	}
>  
>  	mtk_ddp_sout_sel(config_regs, cur, next);
>  
>  	value = mtk_ddp_sel_in(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) | value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg |= value;
> +		regmap_write(config_regs, addr, reg);
>  	}
>  }
>  
> -void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
> +void mtk_ddp_remove_comp_from_path(struct regmap *config_regs,
>  				   enum mtk_ddp_comp_id cur,
>  				   enum mtk_ddp_comp_id next)
>  {
> @@ -223,14 +225,16 @@ void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
>  
>  	value = mtk_ddp_mout_en(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) & ~value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg &= ~value;
> +		regmap_write(config_regs, addr, reg);
>  	}
>  
>  	value = mtk_ddp_sel_in(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) & ~value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg &= ~value;
> +		regmap_write(config_regs, addr, reg);
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> index f9a799168077..32e12f33b76a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> @@ -20,10 +20,10 @@ struct regmap;
>  struct device;
>  struct mtk_disp_mutex;
>  
> -void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
> +void mtk_ddp_add_comp_to_path(struct regmap *config_regs,
>  			      enum mtk_ddp_comp_id cur,
>  			      enum mtk_ddp_comp_id next);
> -void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
> +void mtk_ddp_remove_comp_from_path(struct regmap *config_regs,
>  				   enum mtk_ddp_comp_id cur,
>  				   enum mtk_ddp_comp_id next);
>  
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index b2ad19bd1e00..dd249cf5121e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -21,6 +21,7 @@
>  #include <drm/drm_of.h>
>  #include <linux/component.h>
>  #include <linux/iommu.h>
> +#include <linux/mfd/syscon.h>
>  #include <linux/of_address.h>
>  #include <linux/of_platform.h>
>  #include <linux/pm_runtime.h>
> @@ -393,7 +394,6 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct mtk_drm_private *private;
> -	struct resource *mem;
>  	struct device_node *node;
>  	struct component_match *match = NULL;
>  	int ret;
> @@ -407,14 +407,9 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  	INIT_WORK(&private->commit.work, mtk_atomic_work);
>  	private->data = of_device_get_match_data(dev);
>  
> -	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	private->config_regs = devm_ioremap_resource(dev, mem);
> -	if (IS_ERR(private->config_regs)) {
> -		ret = PTR_ERR(private->config_regs);
> -		dev_err(dev, "Failed to ioremap mmsys-config resource: %d\n",
> -			ret);
> -		return ret;
> -	}
> +	private->config_regs = syscon_node_to_regmap(dev->of_node);
> +	if (IS_ERR(private->config_regs))
> +		return PTR_ERR(private->config_regs);
>  
>  	/* Iterate over sibling DISP function blocks */
>  	for_each_child_of_node(dev->of_node->parent, node) {
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index 4edc0023684c..86cec19193c4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -44,7 +44,7 @@ struct mtk_drm_private {
>  
>  	struct device_node *mutex_node;
>  	struct device *mutex_dev;
> -	void __iomem *config_regs;
> +	struct regmap *config_regs;
>  	struct device_node *comp_node[DDP_COMPONENT_ID_MAX];
>  	struct mtk_ddp_comp *ddp_comp[DDP_COMPONENT_ID_MAX];
>  	const struct mtk_mmsys_driver_data *data;
Philipp Zabel Nov. 23, 2017, 8:54 a.m. UTC | #2 
Hi Matthias,

On Tue, 2017-11-14 at 22:41 +0100, Matthias Brugger wrote:
> The mmsys memory space is shared between the drm and the
> clk driver. Use regmap to access it.
> 
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  4 ++--
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 30 +++++++++++++++++-------------
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |  4 ++--
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 13 ++++---------
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h  |  2 +-
>  5 files changed, 26 insertions(+), 27 deletions(-)
[...]
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index 8130f3dab661..1227d6db07da 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -185,16 +185,16 @@ static unsigned int mtk_ddp_sel_in(enum mtk_ddp_comp_id cur,
>  	return value;
>  }
>  
> -static void mtk_ddp_sout_sel(void __iomem *config_regs,
> +static void mtk_ddp_sout_sel(struct regmap *config_regs,
>  			     enum mtk_ddp_comp_id cur,
>  			     enum mtk_ddp_comp_id next)
>  {
>  	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0)
> -		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
> -			       config_regs + DISP_REG_CONFIG_OUT_SEL);
> +		regmap_write(config_regs, DISP_REG_CONFIG_OUT_SEL,
> +				BLS_TO_DSI_RDMA1_TO_DPI1);
>  }
>  
> -void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
> +void mtk_ddp_add_comp_to_path(struct regmap *config_regs,
>  			      enum mtk_ddp_comp_id cur,
>  			      enum mtk_ddp_comp_id next)
>  {
> @@ -202,20 +202,22 @@ void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
>  
>  	value = mtk_ddp_mout_en(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) | value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg |= value;
> +		regmap_write(config_regs, addr, reg);

You can use

		regmap_update_bits(config_regs, addr, value, value);

here and drop the local variable reg.

>  	}
>  
>  	mtk_ddp_sout_sel(config_regs, cur, next);
>  
>  	value = mtk_ddp_sel_in(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) | value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg |= value;
> +		regmap_write(config_regs, addr, reg);

		regmap_update_bits(config_regs, addr, value, value);

>  	}
>  }
>  
> -void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
> +void mtk_ddp_remove_comp_from_path(struct regmap *config_regs,
>  				   enum mtk_ddp_comp_id cur,
>  				   enum mtk_ddp_comp_id next)
>  {
> @@ -223,14 +225,16 @@ void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
>  
>  	value = mtk_ddp_mout_en(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) & ~value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg &= ~value;
> +		regmap_write(config_regs, addr, reg);

		regmap_update_bits(config_regs, addr, value, 0);

>  	}
>  
>  	value = mtk_ddp_sel_in(cur, next, &addr);
>  	if (value) {
> -		reg = readl_relaxed(config_regs + addr) & ~value;
> -		writel_relaxed(reg, config_regs + addr);
> +		regmap_read(config_regs, addr, &reg);
> +		reg &= ~value;
> +		regmap_write(config_regs, addr, reg);

		regmap_update_bits(config_regs, addr, value, 0);

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp
Matthias Brugger April 20, 2018, 9:41 a.m. UTC | #3 
Hi Philipp,

On 11/23/2017 09:54 AM, Philipp Zabel wrote:
> Hi Matthias,
> 
> On Tue, 2017-11-14 at 22:41 +0100, Matthias Brugger wrote:
>> The mmsys memory space is shared between the drm and the
>> clk driver. Use regmap to access it.
>>
>> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
>> ---
>>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  4 ++--
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 30 +++++++++++++++++-------------
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |  4 ++--
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 13 ++++---------
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.h  |  2 +-
>>  5 files changed, 26 insertions(+), 27 deletions(-)
> [...]
[...]
>>  	}
>>  
>>  	value = mtk_ddp_sel_in(cur, next, &addr);
>>  	if (value) {
>> -		reg = readl_relaxed(config_regs + addr) & ~value;
>> -		writel_relaxed(reg, config_regs + addr);
>> +		regmap_read(config_regs, addr, &reg);
>> +		reg &= ~value;
>> +		regmap_write(config_regs, addr, reg);
> 
> 		regmap_update_bits(config_regs, addr, value, 0);
> 
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> 

Thanks for having a look on that.

I'll update the next version with regmap_update_bits and leave your Reviewed-by,
hope that's ok.

Regards,
Matthias
Philipp Zabel April 20, 2018, 10 a.m. UTC | #4 
Hi Matthias,

On Fri, 2018-04-20 at 11:41 +0200, Matthias Brugger wrote:
> Hi Philipp,
> 
> On 11/23/2017 09:54 AM, Philipp Zabel wrote:
> > Hi Matthias,
> > 
> > On Tue, 2017-11-14 at 22:41 +0100, Matthias Brugger wrote:
> > > The mmsys memory space is shared between the drm and the
> > > clk driver. Use regmap to access it.
> > > 
> > > Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> > > ---
> > >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  4 ++--
> > >  drivers/gpu/drm/mediatek/mtk_drm_ddp.c  | 30 +++++++++++++++++-------------
> > >  drivers/gpu/drm/mediatek/mtk_drm_ddp.h  |  4 ++--
> > >  drivers/gpu/drm/mediatek/mtk_drm_drv.c  | 13 ++++---------
> > >  drivers/gpu/drm/mediatek/mtk_drm_drv.h  |  2 +-
> > >  5 files changed, 26 insertions(+), 27 deletions(-)
> > 
> > [...]
> 
> [...]
> > >  	}
> > >  
> > >  	value = mtk_ddp_sel_in(cur, next, &addr);
> > >  	if (value) {
> > > -		reg = readl_relaxed(config_regs + addr) & ~value;
> > > -		writel_relaxed(reg, config_regs + addr);
> > > +		regmap_read(config_regs, addr, &reg);
> > > +		reg &= ~value;
> > > +		regmap_write(config_regs, addr, reg);
> > 
> > 		regmap_update_bits(config_regs, addr, value, 0);
> > 
> > Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> > 
> 
> Thanks for having a look on that.
> 
> I'll update the next version with regmap_update_bits and leave your Reviewed-by,
> hope that's ok.

Yes, that's fine.

regards
Philipp
diff mbox

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 658b8dd45b83..4c65873b4867 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -33,7 +33,7 @@ 
  * @enabled: records whether crtc_enable succeeded
  * @planes: array of 4 drm_plane structures, one for each overlay plane
  * @pending_planes: whether any plane has pending changes to be applied
- * @config_regs: memory mapped mmsys configuration register space
+ * @config_regs: regmap mapped mmsys configuration register space
  * @mutex: handle to one of the ten disp_mutex streams
  * @ddp_comp_nr: number of components in ddp_comp
  * @ddp_comp: array of pointers the mtk_ddp_comp structures used by this crtc
@@ -48,7 +48,7 @@  struct mtk_drm_crtc {
 	struct drm_plane		planes[OVL_LAYER_NR];
 	bool				pending_planes;
 
-	void __iomem			*config_regs;
+	struct regmap			*config_regs;
 	struct mtk_disp_mutex		*mutex;
 	unsigned int			ddp_comp_nr;
 	struct mtk_ddp_comp		**ddp_comp;
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
index 8130f3dab661..1227d6db07da 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
@@ -185,16 +185,16 @@  static unsigned int mtk_ddp_sel_in(enum mtk_ddp_comp_id cur,
 	return value;
 }
 
-static void mtk_ddp_sout_sel(void __iomem *config_regs,
+static void mtk_ddp_sout_sel(struct regmap *config_regs,
 			     enum mtk_ddp_comp_id cur,
 			     enum mtk_ddp_comp_id next)
 {
 	if (cur == DDP_COMPONENT_BLS && next == DDP_COMPONENT_DSI0)
-		writel_relaxed(BLS_TO_DSI_RDMA1_TO_DPI1,
-			       config_regs + DISP_REG_CONFIG_OUT_SEL);
+		regmap_write(config_regs, DISP_REG_CONFIG_OUT_SEL,
+				BLS_TO_DSI_RDMA1_TO_DPI1);
 }
 
-void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
+void mtk_ddp_add_comp_to_path(struct regmap *config_regs,
 			      enum mtk_ddp_comp_id cur,
 			      enum mtk_ddp_comp_id next)
 {
@@ -202,20 +202,22 @@  void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
 
 	value = mtk_ddp_mout_en(cur, next, &addr);
 	if (value) {
-		reg = readl_relaxed(config_regs + addr) | value;
-		writel_relaxed(reg, config_regs + addr);
+		regmap_read(config_regs, addr, &reg);
+		reg |= value;
+		regmap_write(config_regs, addr, reg);
 	}
 
 	mtk_ddp_sout_sel(config_regs, cur, next);
 
 	value = mtk_ddp_sel_in(cur, next, &addr);
 	if (value) {
-		reg = readl_relaxed(config_regs + addr) | value;
-		writel_relaxed(reg, config_regs + addr);
+		regmap_read(config_regs, addr, &reg);
+		reg |= value;
+		regmap_write(config_regs, addr, reg);
 	}
 }
 
-void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
+void mtk_ddp_remove_comp_from_path(struct regmap *config_regs,
 				   enum mtk_ddp_comp_id cur,
 				   enum mtk_ddp_comp_id next)
 {
@@ -223,14 +225,16 @@  void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
 
 	value = mtk_ddp_mout_en(cur, next, &addr);
 	if (value) {
-		reg = readl_relaxed(config_regs + addr) & ~value;
-		writel_relaxed(reg, config_regs + addr);
+		regmap_read(config_regs, addr, &reg);
+		reg &= ~value;
+		regmap_write(config_regs, addr, reg);
 	}
 
 	value = mtk_ddp_sel_in(cur, next, &addr);
 	if (value) {
-		reg = readl_relaxed(config_regs + addr) & ~value;
-		writel_relaxed(reg, config_regs + addr);
+		regmap_read(config_regs, addr, &reg);
+		reg &= ~value;
+		regmap_write(config_regs, addr, reg);
 	}
 }
 
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
index f9a799168077..32e12f33b76a 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
@@ -20,10 +20,10 @@  struct regmap;
 struct device;
 struct mtk_disp_mutex;
 
-void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
+void mtk_ddp_add_comp_to_path(struct regmap *config_regs,
 			      enum mtk_ddp_comp_id cur,
 			      enum mtk_ddp_comp_id next);
-void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
+void mtk_ddp_remove_comp_from_path(struct regmap *config_regs,
 				   enum mtk_ddp_comp_id cur,
 				   enum mtk_ddp_comp_id next);
 
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index b2ad19bd1e00..dd249cf5121e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -21,6 +21,7 @@ 
 #include <drm/drm_of.h>
 #include <linux/component.h>
 #include <linux/iommu.h>
+#include <linux/mfd/syscon.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/pm_runtime.h>
@@ -393,7 +394,6 @@  static int mtk_drm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct mtk_drm_private *private;
-	struct resource *mem;
 	struct device_node *node;
 	struct component_match *match = NULL;
 	int ret;
@@ -407,14 +407,9 @@  static int mtk_drm_probe(struct platform_device *pdev)
 	INIT_WORK(&private->commit.work, mtk_atomic_work);
 	private->data = of_device_get_match_data(dev);
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	private->config_regs = devm_ioremap_resource(dev, mem);
-	if (IS_ERR(private->config_regs)) {
-		ret = PTR_ERR(private->config_regs);
-		dev_err(dev, "Failed to ioremap mmsys-config resource: %d\n",
-			ret);
-		return ret;
-	}
+	private->config_regs = syscon_node_to_regmap(dev->of_node);
+	if (IS_ERR(private->config_regs))
+		return PTR_ERR(private->config_regs);
 
 	/* Iterate over sibling DISP function blocks */
 	for_each_child_of_node(dev->of_node->parent, node) {
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 4edc0023684c..86cec19193c4 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -44,7 +44,7 @@  struct mtk_drm_private {
 
 	struct device_node *mutex_node;
 	struct device *mutex_dev;
-	void __iomem *config_regs;
+	struct regmap *config_regs;
 	struct device_node *comp_node[DDP_COMPONENT_ID_MAX];
 	struct mtk_ddp_comp *ddp_comp[DDP_COMPONENT_ID_MAX];
 	const struct mtk_mmsys_driver_data *data;