linux-kernel - Re: [PATCH 3/3] bus: ti-sysc: Implement display subsystem reset quirk

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Date:   Wed, 4 Mar 2020 09:02:02 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <linux-omap@...r.kernel.org>, "Andrew F . Davis" <afd@...com>,
        Dave Gerlach <d-gerlach@...com>,
        Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>, Suman Anna <s-anna@...com>,
        Tero Kristo <t-kristo@...com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, Jyri Sarha <jsarha@...com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 3/3] bus: ti-sysc: Implement display subsystem reset quirk

On 03/03/2020 17:49, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [200303 15:14]:
>> * Tomi Valkeinen <tomi.valkeinen@...com> [200303 06:03]:
>>> On 24/02/2020 21:12, Tony Lindgren wrote:
>>>> +	if (sysc_soc->soc == SOC_3430) {
>>>> +		/* Clear DSS_SDI_CONTROL */
>>>> +		sysc_write(ddata, dispc_offset + 0x44, 0);
>>>> +
>>>> +		/* Clear DSS_PLL_CONTROL */
>>>> +		sysc_write(ddata, dispc_offset + 0x48, 0);
>>>
>>> These are not dispc registers, but dss registers.
>>
>> Ouch. Thanks for catching this, will include in the fix.
>>
>>>> +	}
>>>> +
>>>> +	/* Clear DSS_CONTROL to switch DSS clock sources to PRCM if not */
>>>> +	sysc_write(ddata, dispc_offset + 0x40, 0);
>>>
>>> Same here.
> 
> Below is a fix using dispc offset for dss registers.
> 
> Regards,
> 
> Tony
> 
> 8< ----------------------
>  From tony Mon Sep 17 00:00:00 2001
> From: Tony Lindgren <tony@...mide.com>
> Date: Tue, 3 Mar 2020 07:17:43 -0800
> Subject: [PATCH] bus: ti-sysc: Fix wrong offset for display subsystem
>   reset quirk
> 
> Commit 7324a7a0d5e2 ("bus: ti-sysc: Implement display subsystem reset
> quirk") added support for DSS reset, but is using dispc offset also for
> DSS also registers as reported by Tomi Valkeinen <tomi.valkeinen@...com>.
> Also, we're not using dispc_offset for dispc IRQSTATUS register so let's
> fix that too.
> 
> Fixes: 7324a7a0d5e2 ("bus: ti-sysc: Implement display subsystem reset quirk")
> Reported-by: Tomi Valkeinen <tomi.valkeinen@...com>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>   drivers/bus/ti-sysc.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -1566,7 +1566,7 @@ static void sysc_pre_reset_quirk_dss(struct sysc *ddata)
>   		return;
>   
>   	/* Clear IRQSTATUS */
> -	sysc_write(ddata, 0x1000 + 0x18, irq_mask);
> +	sysc_write(ddata, dispc_offset + 0x18, irq_mask);
>   
>   	/* Disable outputs */
>   	val = sysc_quirk_dispc(ddata, dispc_offset, true);
> @@ -1580,14 +1580,14 @@ static void sysc_pre_reset_quirk_dss(struct sysc *ddata)
>   
>   	if (sysc_soc->soc == SOC_3430) {
>   		/* Clear DSS_SDI_CONTROL */
> -		sysc_write(ddata, dispc_offset + 0x44, 0);
> +		sysc_write(ddata, 0x44, 0);
>   
>   		/* Clear DSS_PLL_CONTROL */
> -		sysc_write(ddata, dispc_offset + 0x48, 0);
> +		sysc_write(ddata, 0x48, 0);
>   	}
>   
>   	/* Clear DSS_CONTROL to switch DSS clock sources to PRCM if not */
> -	sysc_write(ddata, dispc_offset + 0x40, 0);
> +	sysc_write(ddata, 0x40, 0);
>   }
>   
>   /* 1-wire needs module's internal clocks enabled for reset */
> 

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...com>

  Tomi

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