[U-Boot] [PATCH 05/19] arm: socfpga: Enhance FPGA program support with at least 4 byte data

[Marek Vasut]

On 08/30/2017 10:24 AM, Chee, Tien Fong wrote:
> On Sel, 2017-08-29 at 13:58 +0200, Marek Vasut wrote:
>> On 08/29/2017 12:45 PM, tien.fong.chee at intel.com wrote:
>>>
>>> From: Tien Fong Chee <tien.fong.chee at intel.com>
>>>
>>> This patch enables FPGA program with minimum 4 byte data size.
>> What does that mean ? Expand the description, it's inobvious
>>
> The exisitng FPGA program function only support the FPGA data which
> size is >= 32 bytes. For the size smaller than that, the operation
> would have failed.

Because ... ?

And you fix it how ... ?

That should be in the commit message, describe the problem and how you
fix it.

>>>
>>> Signed-off-by: Tien Fong Chee <tien.fong.chee at intel.com>
>>> ---
>>>  drivers/fpga/socfpga.c |   14 ++++++++------
>>>  1 files changed, 8 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/fpga/socfpga.c b/drivers/fpga/socfpga.c
>>> index 28fa16b..6e14ebd 100644
>>> --- a/drivers/fpga/socfpga.c
>>> +++ b/drivers/fpga/socfpga.c
>>> @@ -1,5 +1,5 @@
>>>  /*
>>> - * Copyright (C) 2012 Altera Corporation <www.altera.com>
>>> + * Copyright (C) 2012-2017 Altera Corporation <www.altera.com>
>>>   * All rights reserved.
>>>   *
>>>   * SPDX-License-Identifier:	BSD-3-Clause
>>> @@ -55,18 +55,20 @@ void fpgamgr_program_write(const void
>>> *rbf_data, size_t rbf_size)
>>>  	uint32_t loops4 = DIV_ROUND_UP(rbf_size % 32, 4);
>>>  
>>>  	asm volatile(
>>> +		"	cmp	%2,	#0\n"
>>> +		"	beq	2f\n"
>>>  		"1:	ldmia	%0!,	{r0-r7}\n"
>>>  		"	stmia	%1!,	{r0-r7}\n"
>>>  		"	sub	%1,	#32\n"
>>>  		"	subs	%2,	#1\n"
>>>  		"	bne	1b\n"
>>> -		"	cmp	%3,	#0\n"
>>> -		"	beq	3f\n"
>>> -		"2:	ldr	%2,	[%0],	#4\n
>>> "
>>> +		"2:	cmp	%3,	#0\n"
>>> +		"	beq	4f\n"
>>> +		"3:	ldr	%2,	[%0],	#4\n
>>> "
>>>  		"	str	%2,	[%1]\n"
>>>  		"	subs	%3,	#1\n"
>>> -		"	bne	2b\n"
>>> -		"3:	nop\n"
>>> +		"	bne	3b\n"
>>> +		"4:	nop\n"
>>>  		: "+r"(src), "+r"(dst), "+r"(loops32),
>>> "+r"(loops4) :
>>>  		: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
>>> "cc");
>>>  }
>>>


-- 
Best regards,
Marek Vasut