linux-kernel - RE: [PATCH v3 1/5] drm/fsl-dcu: enable TCON bypass mode by default

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Message-ID: <a9d2871d25e5b311a83ddd8bd6d34979@agner.ch>
Date:   Wed, 19 Oct 2016 17:01:45 -0700
From:   Stefan Agner <stefan@...er.ch>
To:     Meng Yi <meng.yi@....com>
Cc:     dri-devel@...ts.freedesktop.org, alison.wang@...escale.com,
        jianwei.wang.chn@...il.com, linux-kernel@...r.kernel.org
Subject: RE: [PATCH v3 1/5] drm/fsl-dcu: enable TCON bypass mode by default

On 2016-10-19 02:35, Meng Yi wrote:
>>
>> Do not use encoder disable/enable callbacks to control bypass mode as this
>> seems to mess with the signals not liked by displays. This also makes more
>> sense since the encoder is already defined to be parallel RGB/LVDS at creation
>> time.
>>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
>> ---
>>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c |  2 ++  drivers/gpu/drm/fsl-
>> dcu/fsl_dcu_drm_rgb.c | 39 ++++---------------------------
>>  2 files changed, 7 insertions(+), 34 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-
>> dcu/fsl_dcu_drm_drv.c
>> index 0884c45..3897f56 100644
>> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
>> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
>> @@ -273,6 +273,8 @@ static int fsl_dcu_drm_pm_resume(struct device *dev)
>>  		goto disable_dcu_clk;
>>  	}
>>
>> +	if (fsl_dev->tcon)
>> +		fsl_tcon_bypass_enable(fsl_dev->tcon);
>>  	fsl_dcu_drm_init_planes(fsl_dev->drm);
>>  	drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
>>
>> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-
>> dcu/fsl_dcu_drm_rgb.c
>> index 26edcc8..e1dd75b 100644
>> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
>> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
>> @@ -20,38 +20,6 @@
>>  #include "fsl_dcu_drm_drv.h"
>>  #include "fsl_tcon.h"
>>
>> -static int
>> -fsl_dcu_drm_encoder_atomic_check(struct drm_encoder *encoder,
>> -				 struct drm_crtc_state *crtc_state,
>> -				 struct drm_connector_state *conn_state)
>> -{
>> -	return 0;
>> -}
>> -
>> -static void fsl_dcu_drm_encoder_disable(struct drm_encoder *encoder) -{
>> -	struct drm_device *dev = encoder->dev;
>> -	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
>> -
>> -	if (fsl_dev->tcon)
>> -		fsl_tcon_bypass_disable(fsl_dev->tcon);
>> -}
>> -
>> -static void fsl_dcu_drm_encoder_enable(struct drm_encoder *encoder) -{
>> -	struct drm_device *dev = encoder->dev;
>> -	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
>> -
>> -	if (fsl_dev->tcon)
>> -		fsl_tcon_bypass_enable(fsl_dev->tcon);
>> -}
>> -
>> -static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
>> -	.atomic_check = fsl_dcu_drm_encoder_atomic_check,
>> -	.disable = fsl_dcu_drm_encoder_disable,
>> -	.enable = fsl_dcu_drm_encoder_enable,
>> -};
>> -
>>  static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)  {
>>  	drm_encoder_cleanup(encoder);
>> @@ -68,13 +36,16 @@ int fsl_dcu_drm_encoder_create(struct
>> fsl_dcu_drm_device *fsl_dev,
>>  	int ret;
>>
>>  	encoder->possible_crtcs = 1;
>> +
>> +	/* Use bypass mode for parallel RGB/LVDS encoder */
>> +	if (fsl_dev->tcon)
>> +		fsl_tcon_bypass_enable(fsl_dev->tcon);
>> +
>>  	ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
>>  			       DRM_MODE_ENCODER_LVDS, NULL);
>>  	if (ret < 0)
>>  		return ret;
>>
>> -	drm_encoder_helper_add(encoder, &encoder_helper_funcs);
>> -
>>  	return 0;
>>  }
>>
>> --
>> 2.10.0
> 
> Tested-By: Meng Yi <meng.yi@....com>
> 
> Tested those 5 patches on LS1021a-twr, and everything is fine.

Thanks.

Applied 1~4.

--
Stefan