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From: BALATON Zoltan <balaton@eik.bme.hu>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
Cc: cminyard@mvista.com,
	"Signed-off-by : Frederic Konrad" <frederic.konrad@adacore.com>,
	qemu-arm@nongnu.org, qemu-ppc@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [PATCH v3 06/13] hw/i2c/ppc4xx_i2c: Replace i2c_send_recv() by i2c_recv() & i2c_send()
Date: Fri, 18 Jun 2021 01:49:01 +0200 (CEST)	[thread overview]
Message-ID: <675080b9-cb1-9ee4-c515-ebd0401b302b@eik.bme.hu> (raw)
In-Reply-To: <416b4c36-b838-a5f4-6575-74685627b9c3@amsat.org>

[-- Attachment #1: Type: text/plain, Size: 3179 bytes --]

On Wed, 16 Jun 2021, Philippe Mathieu-Daudé wrote:
> On 6/16/21 10:01 PM, BALATON Zoltan wrote:
>> On Wed, 16 Jun 2021, Philippe Mathieu-Daudé wrote:
>>> On 6/16/21 9:16 PM, Corey Minyard wrote:
>>>> On Wed, Jun 16, 2021 at 06:14:11PM +0200, Philippe Mathieu-Daudé wrote:
>>>>> Instead of using the confuse i2c_send_recv(), rewrite to directly
>>>>> call i2c_recv() & i2c_send(), resulting in code easire to review.
>>>>>
>>>>> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>>>>> ---
>>>>>  hw/i2c/ppc4xx_i2c.c | 13 ++++++++-----
>>>>>  1 file changed, 8 insertions(+), 5 deletions(-)
>>>>>
>>>>> diff --git a/hw/i2c/ppc4xx_i2c.c b/hw/i2c/ppc4xx_i2c.c
>>>>> index f4c5bc12d36..b3d3da56e38 100644
>>>>> --- a/hw/i2c/ppc4xx_i2c.c
>>>>> +++ b/hw/i2c/ppc4xx_i2c.c
>>>>> @@ -240,11 +240,14 @@ static void ppc4xx_i2c_writeb(void *opaque,
>>>>> hwaddr addr, uint64_t value,
>>>>>                          i2c->sts &= ~IIC_STS_ERR;
>>>>>                      }
>>>>>                  }
>>>>> -                if (!(i2c->sts & IIC_STS_ERR) &&
>>>>> -                    i2c_send_recv(i2c->bus, &i2c->mdata[i], !recv)) {
>>>>> -                    i2c->sts |= IIC_STS_ERR;
>>>>> -                    i2c->extsts |= IIC_EXTSTS_XFRA;
>>>>> -                    break;
>>>>> +                if (!(i2c->sts & IIC_STS_ERR)) {
>>>>> +                    if (recv) {
>>>>> +                        i2c->mdata[i] = i2c_recv(i2c->bus);
>>>>> +                    } else if (i2c_send(i2c->bus, i2c->mdata[i])) {
>>>>
>>>> In the previous patch you checked < 0, it would be nice to be
>>>> consistent.
>>>
>>> I did that first but thought Zoltan wouldn't be happy, then went back :)
>>>
>>> I'll fix for the next iteration, thanks.
>>
>> I generally had no problem with i2c_send_recv only that its argument
>> that decides which operation to do was inverted compared to other
>> similar i2c functions so my original patch just corrected that for
>> consistency and I was happy with that.
>
> But we have to make the maintainer happy too to get patch merged ;)
>
>> Having a send_recv in one func
>> allowed to avoid if-else in some places like these but if you think it's
>> better without this function at all I can work with that too. I'll have
>> to check if these changes could break anything. At first sight I'm not
>> sure errors are handled as before if recv fails but it was years ago I
>> did the sm501 and ati parts and I forgot how they work so I need to
>> check again. I'll wait for the final version of the series then and test
>> that.
>
> Thanks, that would be great!

I've tried AmigaOS and MorphOS on sam460ex and mac99 with sm501 and 
ati-vga and these still work so I think the patches are OK but I did not 
test other changes to other machines so I did not give a tested-by for the 
series just some reviewed-by to patches I've verified. (Found a regression 
with AROS but that's not related to these changes.)

Regards,
BALATON Zoltan

  parent reply	other threads:[~2021-06-17 23:49 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 16:14 [PATCH v3 00/13] hw/i2c: Remove confusing i2c_send_recv() API Philippe Mathieu-Daudé
2021-06-16 16:14 ` [PATCH v3 01/13] hw/input/lm832x: Move lm832x_key_event() declaration to "lm832x.h" Philippe Mathieu-Daudé
2021-06-16 18:38   ` Richard Henderson
2021-06-16 19:23     ` Philippe Mathieu-Daudé
2021-06-16 16:14 ` [PATCH v3 02/13] hw/input/lm832x: Define TYPE_LM8323 in public header Philippe Mathieu-Daudé
2021-06-16 18:39   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 03/13] hw/display/sm501: Simplify sm501_i2c_write() logic Philippe Mathieu-Daudé
2021-06-16 18:39   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 04/13] hw/display/sm501: Replace i2c_send_recv() by i2c_recv() & i2c_send() Philippe Mathieu-Daudé
2021-06-16 18:40   ` Richard Henderson
2021-06-16 19:14   ` Corey Minyard
2021-06-16 16:14 ` [PATCH v3 05/13] hw/i2c/ppc4xx_i2c: Add reference to datasheet Philippe Mathieu-Daudé
2021-06-16 18:40   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 06/13] hw/i2c/ppc4xx_i2c: Replace i2c_send_recv() by i2c_recv() & i2c_send() Philippe Mathieu-Daudé
2021-06-16 18:41   ` Richard Henderson
2021-06-16 19:16   ` Corey Minyard
2021-06-16 19:25     ` Philippe Mathieu-Daudé
2021-06-16 20:01       ` BALATON Zoltan
2021-06-16 20:28         ` Philippe Mathieu-Daudé
2021-06-16 23:09           ` BALATON Zoltan
2021-06-16 23:42             ` Corey Minyard
2021-06-17 23:49           ` BALATON Zoltan [this message]
2021-06-18  8:54             ` Philippe Mathieu-Daudé
2021-06-16 16:14 ` [PATCH v3 07/13] hw/misc/auxbus: Fix MOT/classic I2C mode Philippe Mathieu-Daudé
2021-06-16 18:41   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 08/13] hw/misc/auxbus: Explode READ_I2C / WRITE_I2C_MOT cases Philippe Mathieu-Daudé
2021-06-16 18:41   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 09/13] hw/misc/auxbus: Replace 'is_write' boolean by its value Philippe Mathieu-Daudé
2021-06-16 18:43   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 10/13] hw/misc/auxbus: Replace i2c_send_recv() by i2c_recv() & i2c_send() Philippe Mathieu-Daudé
2021-06-16 18:46   ` Richard Henderson
2021-06-16 19:28     ` Philippe Mathieu-Daudé
2021-06-16 20:06       ` BALATON Zoltan
2021-06-16 16:14 ` [PATCH v3 11/13] hw/i2c: Remove confusing i2c_send_recv() Philippe Mathieu-Daudé
2021-06-16 18:47   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 12/13] hw/i2c: Rename i2c_set_slave_address() -> i2c_slave_set_address() Philippe Mathieu-Daudé
2021-06-16 18:50   ` Richard Henderson
2021-06-16 16:14 ` [PATCH v3 13/13] hw/i2c: Make i2c_start_transfer() direction argument a boolean Philippe Mathieu-Daudé
2021-06-16 19:02   ` Richard Henderson
2021-06-16 19:28 ` [PATCH v3 00/13] hw/i2c: Remove confusing i2c_send_recv() API Corey Minyard

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