linux-kernel - Re: [PATCH] drm/komeda: Correct d71 register block counting

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Message-ID: <1904852.g9mvNTCQN0@e123338-lin>
Date:   Wed, 11 Dec 2019 17:30:01 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     "james qian wang (Arm Technology China)" <james.qian.wang@....com>
CC:     nd <nd@....com>,
        "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        "Tiannan Zhu (Arm Technology China)" <Tiannan.Zhu@....com>,
        nd <nd@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Ben Davis <Ben.Davis@....com>,
        "Oscar Zhang (Arm Technology China)" <Oscar.Zhang@....com>,
        "Channing Chen (Arm Technology China)" <Channing.Chen@....com>
Subject: Re: [PATCH] drm/komeda: Correct d71 register block counting

On Tuesday, 10 December 2019 06:10:34 GMT james qian wang (Arm Technology China) wrote:
> Per HW, d71->num_blocks includes reserved blocks but no PERIPH block,
> correct the block counting accordingly.
> D71 happens to only have one reserved block and periph block, which
> hides this counting error.
> 
> Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@....com>
> ---
>  drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
> index 822b23a1ce75..d53f95dea0a1 100644
> --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
> +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
> @@ -414,8 +414,11 @@ static int d71_enum_resources(struct komeda_dev *mdev)
>  		d71->pipes[i] = to_d71_pipeline(pipe);
>  	}
>  
> -	/* loop the register blks and probe */
> -	i = 2; /* exclude GCU and PERIPH */
> +	/* loop the register blks and probe.
> +	 * NOTE: d71->num_blocks includes reserved blocks.
> +	 * d71->num_blocks = GCU + valid blocks + reserved blocks
> +	 */
> +	i = 1; /* exclude GCU */
>  	offset = D71_BLOCK_SIZE; /* skip GCU */
>  	while (i < d71->num_blocks) {
>  		blk_base = mdev->reg_base + (offset >> 2);
> @@ -425,9 +428,9 @@ static int d71_enum_resources(struct komeda_dev *mdev)
>  			err = d71_probe_block(d71, &blk, blk_base);
>  			if (err)
>  				goto err_cleanup;
> -			i++;
>  		}
>  
> +		i++;
>  		offset += D71_BLOCK_SIZE;
>  	}
>  
> 

Reviewed-by: Mihail Atanassov <mihail.atanassov@....com>

-- 
Mihail