Re: [PATCH] drm/exynos/decon5433: configure sysreg in case of hardware trigger

[Inki Dae <inki.dae@samsung.com>]

2017년 01월 05일 19:15에 Andrzej Hajda 이(가) 쓴 글:
> On 05.01.2017 11:05, Inki Dae wrote:
>>
>> 2017년 01월 02일 17:39에 Andrzej Hajda 이(가) 쓴 글:
>>> In case of HW trigger mode, sysreg register should be configured to
>>> enable TE functionality. The patch refactors also trigger setup function.
>>>
>>> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
>>> ---
>>> v2: fixed bitop operator (thanks Ilia)
>>> ---
>>>  drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 40 +++++++++++++++++++++------
>>>  1 file changed, 32 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
>>> index 6ca1f31..b63b8e6 100644
>>> --- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
>>> +++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
>>> @@ -13,9 +13,11 @@
>>>  #include <linux/platform_device.h>
>>>  #include <linux/clk.h>
>>>  #include <linux/component.h>
>>> +#include <linux/mfd/syscon.h>
>>>  #include <linux/of_device.h>
>>>  #include <linux/of_gpio.h>
>>>  #include <linux/pm_runtime.h>
>>> +#include <linux/regmap.h>
>>>  
>>>  #include <video/exynos5433_decon.h>
>>>  
>>> @@ -25,6 +27,9 @@
>>>  #include "exynos_drm_plane.h"
>>>  #include "exynos_drm_iommu.h"
>>>  
>>> +#define DSD_CFG_MUX 0x1004
>>> +#define DSD_CFG_MUX_TE_UNMASK_GLOBAL BIT(13)
>>> +
>>>  #define WINDOWS_NR	3
>>>  #define MIN_FB_WIDTH_FOR_16WORD_BURST	128
>>>  
>>> @@ -56,6 +61,7 @@ struct decon_context {
>>>  	struct exynos_drm_plane		planes[WINDOWS_NR];
>>>  	struct exynos_drm_plane_config	configs[WINDOWS_NR];
>>>  	void __iomem			*addr;
>>> +	struct regmap			*sysreg;
>>>  	struct clk			*clks[ARRAY_SIZE(decon_clks_name)];
>>>  	int				pipe;
>>>  	unsigned long			flags;
>>> @@ -117,12 +123,22 @@ static void decon_disable_vblank(struct exynos_drm_crtc *crtc)
>>>  
>>>  static void decon_setup_trigger(struct decon_context *ctx)
>>>  {
>>> -	u32 val = !(ctx->out_type & I80_HW_TRG)
>>> -		? TRIGCON_TRIGEN_PER_F | TRIGCON_TRIGEN_F |
>>> -		  TRIGCON_TE_AUTO_MASK | TRIGCON_SWTRIGEN
>>> -		: TRIGCON_TRIGEN_PER_F | TRIGCON_TRIGEN_F |
>>> -		  TRIGCON_HWTRIGMASK | TRIGCON_HWTRIGEN;
>>> -	writel(val, ctx->addr + DECON_TRIGCON);
>>> +	if (!(ctx->out_type & (IFTYPE_I80 | I80_HW_TRG)))
>>> +		return;
>>> +
>>> +	if (!(ctx->out_type & I80_HW_TRG)) {
>>> +		writel(TRIGCON_TE_AUTO_MASK | TRIGCON_SWTRIGEN
>>> +		       | TRIGCON_TE_AUTO_MASK | TRIGCON_SWTRIGEN,
>>> +		       ctx->addr + DECON_TRIGCON);
>>> +		return;
>>> +	}
>>> +
>>> +	writel(TRIGCON_TRIGEN_PER_F | TRIGCON_TRIGEN_F | TRIGCON_HWTRIGMASK
>>> +	       | TRIGCON_HWTRIGEN, ctx->addr + DECON_TRIGCON);
>>> +
>>> +	if (regmap_update_bits(ctx->sysreg, DSD_CFG_MUX,
>>> +			       DSD_CFG_MUX_TE_UNMASK_GLOBAL, ~0))
>>> +		DRM_ERROR("Cannot update sysreg.\n");
>>>  }
>>>  
>>>  static void decon_commit(struct exynos_drm_crtc *crtc)
>>> @@ -147,8 +163,7 @@ static void decon_commit(struct exynos_drm_crtc *crtc)
>>>  	val = CMU_CLKGAGE_MODE_SFR_F | CMU_CLKGAGE_MODE_MEM_F;
>>>  	writel(val, ctx->addr + DECON_CMU);
>>>  
>>> -	if (ctx->out_type & (IFTYPE_I80 | I80_HW_TRG))
>>> -		decon_setup_trigger(ctx);
>>> +	decon_setup_trigger(ctx);
>> Calling this function in video mode is unnecessary. Why did you remove above condition?
> 
> I have moved the condition to decon_setup_trigger.

In video mode, it doesn't need to even call decon_setup_trigger function even though this function is just returned.
This is really trivial but it'd better not to call this function so seems no reason to modify.

> 
> Regards
> Andrzej
> 
>>
>>>  
>>>  	/* lcd on and use command if */
>>>  	val = VIDOUT_LCD_ON;
>>> @@ -640,6 +655,15 @@ static int exynos5433_decon_probe(struct platform_device *pdev)
>>>  		ctx->out_type |= IFTYPE_I80;
>>>  	}
>>>  
>>> +	if (ctx->out_type & I80_HW_TRG) {
>>> +		ctx->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
>>> +							"samsung,disp-sysreg");
>>> +		if (IS_ERR(ctx->sysreg)) {
>>> +			dev_err(dev, "failed to get system register\n");
>>> +			return PTR_ERR(ctx->sysreg);
>>> +		}
>>> +	}
>>> +
>>>  	for (i = 0; i < ARRAY_SIZE(decon_clks_name); i++) {
>>>  		struct clk *clk;
>>>  
>>>
>>
> 
> 
> 
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