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Date:   Mon, 11 May 2020 17:10:23 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>, od@...c.me,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kbuild test robot <lkp@...el.com>,
        Julia Lawall <julia.lawall@...6.fr>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v6 4/5] remoteproc: ingenic: Added remoteproc driver

On Tue 21 Apr 08:43 PDT 2020, Paul Cercueil wrote:

> Hi Bjorn,
> 
> Le dim. 19 avril 2020 à 23:37, Bjorn Andersson <bjorn.andersson@...aro.org>
> a écrit :
> > On Fri 17 Apr 10:00 PDT 2020, Paul Cercueil wrote:
> > 
> > >  This driver is used to boot, communicate with and load firmwares to
> > > the
> > >  MIPS co-processor found in the VPU hardware of the JZ47xx SoCs from
> > >  Ingenic.
> > > 
> > >  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> > >  Signed-off-by: kbuild test robot <lkp@...el.com>
> > >  Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
> > 
> > Please read Documentation/process/submitting-patches.rst about
> > "Developer's Certificate of Origin".
> > 
> > I suspect that you incorporated review feedback on previous revisions
> > from kbuild and Julia, this is generally omitted from the actual commit
> > message.
> 
> Julia / kbuild sent a patch to fix an error in the driver, so my patch now
> has code from Julia / kbuild. That document clearly says that I should add
> their signed-off-by. Or what do you mean?
> 

We generally don't attribute people whom through code review affected
the outcome, unless perhaps it's significant.

But a bigger problem is that per "Developer's Certificate of Origin 1.1"
in submitting-patches.rst, what this says is:

1) You wrote the patch, in whole or in part and have the right to
   submit it to the public kernel. I.e. (a) and (d)

2) Then "kbuild test robot" claims that either it based it's
   contribution on your work, or that it forwards the unmodified work
   ((b) or (c)) and (d).

3) Then Julia again took the contribution from "kbuild test robot" and
   is claiming to follow either (b) or (c) - and (d).

Then somehow, after Julia stated that she dealt with the patch you
emailed it to me.

In order to claim that the three of you developed the patch together you
should add all three as "Co-developed-by:", in addition to the signed
off by.


But again, my recommendation is that you consider their input as "review
feedback" and just incorporate it in the patch without any additional
tags. You're still fulfilling the certificate of origin.

Regards,
Bjorn

> > >  Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> > >  ---
> > > 
> > >  Notes:
> > >      v2: Remove exception for always-mapped memories
> > >      v3: - Use clk_bulk API
> > >      	- Move device-managed code to its own patch [3/4]
> > >      	- Move devicetree table right above ingenic_rproc_driver
> > >      	- Removed #ifdef CONFIG_OF around devicetree table
> > >      	- Removed .owner = THIS_MODULE in ingenic_rproc_driver
> > >      	- Removed useless platform_set_drvdata()
> > >      v4: - Add fix reported by Julia
> > >      	- Change Kconfig symbol to INGENIC_VPU_RPROC
> > >      	- Add documentation to struct vpu
> > >      	- disable_irq_nosync() -> disable_irq()
> > >      v5: No change
> > >      v6: Instead of prepare/unprepare callbacks, use PM runtime
> > > callbacks
> > > 
> > >   drivers/remoteproc/Kconfig         |   8 +
> > >   drivers/remoteproc/Makefile        |   1 +
> > >   drivers/remoteproc/ingenic_rproc.c | 282
> > > +++++++++++++++++++++++++++++
> > >   3 files changed, 291 insertions(+)
> > >   create mode 100644 drivers/remoteproc/ingenic_rproc.c
> > > 
> > >  diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> > >  index fbaed079b299..31da3e6c6281 100644
> > >  --- a/drivers/remoteproc/Kconfig
> > >  +++ b/drivers/remoteproc/Kconfig
> > >  @@ -240,6 +240,14 @@ config STM32_RPROC
> > > 
> > >   	  This can be either built-in or a loadable module.
> > > 
> > >  +config INGENIC_VPU_RPROC
> > 
> > Please try to keep things alphabetically ordered.
> > 
> > >  +	tristate "Ingenic JZ47xx VPU remoteproc support"
> > >  +	depends on MIPS || COMPILE_TEST
> > >  +	help
> > >  +	  Say y or m here to support the VPU in the JZ47xx SoCs from
> > > Ingenic.
> > >  +	  This can be either built-in or a loadable module.
> > >  +	  If unsure say N.
> > >  +
> > >   endif # REMOTEPROC
> > > 
> > >   endmenu
> > [..]
> > >  diff --git a/drivers/remoteproc/ingenic_rproc.c
> > > b/drivers/remoteproc/ingenic_rproc.c
> > [..]
> > >  +/**
> > >  + * struct vpu - Ingenic VPU remoteproc private structure
> > >  + * @irq: interrupt number
> > >  + * @clks: pointers to the VPU and AUX clocks
> > 
> > aux_base is missing
> > 
> > >  + * @mem_info: array of struct vpu_mem_info, which contain the
> > > mapping info of
> > >  + *            each of the external memories
> > >  + * @dev: private pointer to the device
> > >  + */
> > >  +struct vpu {
> > >  +	int irq;
> > >  +	struct clk_bulk_data clks[2];
> > >  +	void __iomem *aux_base;
> > >  +	struct vpu_mem_info mem_info[ARRAY_SIZE(vpu_mem_map)];
> > >  +	struct device *dev;
> > >  +};
> > [..]
> > >  +static void *ingenic_rproc_da_to_va(struct rproc *rproc, u64 da,
> > > size_t len)
> > >  +{
> > >  +	struct vpu *vpu = rproc->priv;
> > >  +	void __iomem *va = NULL;
> > >  +	unsigned int i;
> > >  +
> > >  +	if (len <= 0)
> > 
> > len can't be negative (also, does it add value to check for and fail len
> > == 0?)
> > 
> > >  +		return NULL;
> > >  +
> > >  +	for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
> > >  +		const struct vpu_mem_info *info = &vpu->mem_info[i];
> > >  +		const struct vpu_mem_map *map = info->map;
> > >  +
> > >  +		if (da >= map->da && (da + len) < (map->da + info->len)) {
> > >  +			va = info->base + (da - map->da);
> > >  +			break;
> > >  +		}
> > >  +	}
> > >  +
> > >  +	return (__force void *)va;
> > >  +}
> > [..]
> > >  +static struct platform_driver ingenic_rproc_driver = {
> > >  +	.probe = ingenic_rproc_probe,
> > >  +	.driver = {
> > >  +		.name = "ingenic-vpu",
> > >  +#ifdef CONFIG_PM
> > 
> > Please omit the #ifdef here.
> 
> If I do, then the PM callbacks will be compiled in even if CONFIG_PM is
> disabled. That means dead code and I see no reason why you would want that.
> 
> If you don't mind, I'd like to keep the #ifdef CONFIG_PM for now, until this
> patchset is merged: https://lkml.org/lkml/2020/4/13/582
> 
> Then it would become a one-liner:
> .pm = pm_ptr(&ingenic_rproc_pm),
> 
> Cheers,
> -Paul
> 
> > >  +		.pm = &ingenic_rproc_pm,
> > >  +#endif
> > >  +		.of_match_table = of_match_ptr(ingenic_rproc_of_matches),
> > 
> > Please omit the of_match_ptr()
> > 
> > Regards,
> > Bjorn
> > 
> > >  +	},
> > >  +};
> > >  +module_platform_driver(ingenic_rproc_driver);
> > >  +
> > >  +MODULE_LICENSE("GPL");
> > >  +MODULE_AUTHOR("Paul Cercueil <paul@...pouillou.net>");
> > >  +MODULE_DESCRIPTION("Ingenic JZ47xx Remote Processor control
> > > driver");
> > >  --
> > >  2.25.1
> > > 
> 
> 

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