[v13,6/6] soc: mediatek: mutex: add functions that operate registers by CMDQ

  Due to hardware limitations, MDP3 is necessary to enable MUTEX in
each frame for SOF triggering and cooperate with CMDQ control to
reduce the amount of interrupts generated(also, reduce frame latency).

In response to the above situation, a new interface
"mtk_mutex_enable_by_cmdq" has been added to achieve the purpose.

Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
---
 drivers/soc/mediatek/mtk-mutex.c       | 42 +++++++++++++++++++++++++-
 include/linux/soc/mediatek/mtk-mutex.h |  2 ++
 2 files changed, 43 insertions(+), 1 deletion(-)
  

Il 15/03/22 07:10, Moudy Ho ha scritto:
> Due to hardware limitations, MDP3 is necessary to enable MUTEX in
> each frame for SOF triggering and cooperate with CMDQ control to
> reduce the amount of interrupts generated(also, reduce frame latency).
> 
> In response to the above situation, a new interface
> "mtk_mutex_enable_by_cmdq" has been added to achieve the purpose.
> 
> Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  

Hi, Moudy:

On Tue, 2022-03-15 at 14:10 +0800, Moudy Ho wrote:
> Due to hardware limitations, MDP3 is necessary to enable MUTEX in
> each frame for SOF triggering and cooperate with CMDQ control to
> reduce the amount of interrupts generated(also, reduce frame
> latency).
> 
> In response to the above situation, a new interface
> "mtk_mutex_enable_by_cmdq" has been added to achieve the purpose.
> 
> Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-mutex.c       | 42
> +++++++++++++++++++++++++-
>  include/linux/soc/mediatek/mtk-mutex.h |  2 ++
>  2 files changed, 43 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-mutex.c
> b/drivers/soc/mediatek/mtk-mutex.c
> index 88fb4fc8f216..0d85111cfbe2 100644
> --- a/drivers/soc/mediatek/mtk-mutex.c
> +++ b/drivers/soc/mediatek/mtk-mutex.c
> @@ -7,10 +7,16 @@
>  #include <linux/iopoll.h>
>  #include <linux/module.h>
>  #include <linux/of_device.h>
> +#include <linux/of_address.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/soc/mediatek/mtk-mmsys.h>
>  #include <linux/soc/mediatek/mtk-mutex.h>
> +#include <linux/soc/mediatek/mtk-cmdq.h>
> +
> +#define MTK_MUTEX_ENABLE			BIT(0)

This is not related to cmdq. Separate this to another patch and apply
to mtk_mutex_enable() also.

> +#define MTK_MUTEX_MOD_MASK			0x07FFFFFF

Useless, remove.

> +#define MTK_MUTEX_SOF_MASK			0x00000007

Ditto.

>  
>  #define MT2701_MUTEX0_MOD0			0x2c
>  #define MT2701_MUTEX0_SOF0			0x30
> @@ -167,6 +173,7 @@ struct mtk_mutex_data {
>  	const unsigned int mutex_sof_reg;
>  	const unsigned long long *mutex_table_mod;
>  	const bool no_clk;
> +	const bool has_gce_client_reg;
>  };
>  
>  struct mtk_mutex_ctx {
> @@ -175,6 +182,8 @@ struct mtk_mutex_ctx {
>  	void __iomem			*regs;
>  	struct mtk_mutex		mutex[10];
>  	const struct mtk_mutex_data	*data;
> +	phys_addr_t			addr;
> +	struct cmdq_client_reg		cmdq_reg;
>  };
>  
>  static const unsigned int mt2701_mutex_mod[DDP_COMPONENT_ID_MAX] = {
> @@ -357,6 +366,7 @@ static const struct mtk_mutex_data
> mt8183_mutex_driver_data = {
>  	.mutex_sof_reg = MT8183_MUTEX0_SOF0,
>  	.mutex_table_mod = mt8183_mutex_table_mod,
>  	.no_clk = true,
> +	.has_gce_client_reg = true,
>  };
>  
>  static const struct mtk_mutex_data mt8186_mutex_driver_data = {
> @@ -639,6 +649,22 @@ void mtk_mutex_enable(struct mtk_mutex *mutex)
>  }
>  EXPORT_SYMBOL_GPL(mtk_mutex_enable);
>  
> +void mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex,
> +			      struct cmdq_pkt *pkt)
> +{
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +	struct mtk_mutex_ctx *mtx = container_of(mutex, struct
> mtk_mutex_ctx,
> +						 mutex[mutex->id]);
> +
> +	WARN_ON(&mtx->mutex[mutex->id] != mutex);
> +
> +	cmdq_pkt_write_mask(pkt, mtx->cmdq_reg.subsys,
> +			    mtx->aaddr + DISP_REG_MUTEX_EN(mutex->id),
> +			    MTK_MUTEX_ENABLE, MTK_MUTEX_ENABLE);

#else
/* show some error message here */


> +#endif
> +}
> +EXPORT_SYMBOL_GPL(mtk_mutex_enable_by_cmdq);
> +
>  void mtk_mutex_disable(struct mtk_mutex *mutex)
>  {
>  	struct mtk_mutex_ctx *mtx = container_of(mutex, struct
> mtk_mutex_ctx,
> @@ -677,7 +703,7 @@ static int mtk_mutex_probe(struct platform_device
> *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct mtk_mutex_ctx *mtx;
> -	struct resource *regs;
> +	struct resource *regs, addr;
>  	int i;
>  
>  	mtx = devm_kzalloc(dev, sizeof(*mtx), GFP_KERNEL);
> @@ -698,6 +724,20 @@ static int mtk_mutex_probe(struct
> platform_device *pdev)
>  		}
>  	}
>  
> +	if (of_address_to_resource(dev->of_node, 0, &addr) < 0)
> +		mtx->addr = 0L;
> +	else
> +		mtx->addr = addr.start;
> +
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +	if (mtx->data->has_gce_client_reg) {

In current upstreamed mt8183.dtsi [1], mutex device node has no
mediatek,gce-client-reg property and display maybe work (?). So I think
this should be backward-compatible.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/mediatek/mt8183.dtsi?h=v5.17-rc8#n1510

Regards,
CK

> +		if (cmdq_dev_get_client_reg(dev, &mtx->cmdq_reg, 0)) {
> +			dev_err(dev, "No mediatek,gce-client-reg!\n");
> +			return ret;
> +		}
> +	}
> +#endif
> +
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	mtx->regs = devm_ioremap_resource(dev, regs);
>  	if (IS_ERR(mtx->regs)) {
> diff --git a/include/linux/soc/mediatek/mtk-mutex.h
> b/include/linux/soc/mediatek/mtk-mutex.h
> index c8355bb0e6d6..18a4b1dc3773 100644
> --- a/include/linux/soc/mediatek/mtk-mutex.h
> +++ b/include/linux/soc/mediatek/mtk-mutex.h
> @@ -45,6 +45,8 @@ void mtk_mutex_set_mod(struct mtk_mutex *mutex,
>  void mtk_mutex_set_sof(struct mtk_mutex *mutex,
>  		       enum mtk_mutex_table_index idx);
>  void mtk_mutex_enable(struct mtk_mutex *mutex);
> +void mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex,
> +			      struct cmdq_pkt *pkt);
>  void mtk_mutex_disable(struct mtk_mutex *mutex);
>  void mtk_mutex_remove_comp(struct mtk_mutex *mutex,
>  			   enum mtk_ddp_comp_id id);