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Date: Fri, 29 May 2020 17:03:39 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Sandeep Singh <Sandeep.Singh@....com>
Cc: Jiri Kosina <jikos@...nel.org>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-input <linux-input@...r.kernel.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
Jonathan Cameron <jic23@...nel.org>,
linux-iio <linux-iio@...r.kernel.org>,
Hans de Goede <hdegoede@...hat.com>,
"Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>,
Richard Neumann <mail@...hard-neumann.de>,
Shyam-sundar.S-k@....com
Subject: Re: [PATCH v5 2/4] SFH: PCI driver to add support of AMD sensor
fusion Hub using HID framework
On Fri, May 29, 2020 at 4:42 PM Sandeep Singh <Sandeep.Singh@....com> wrote:
>
> From: Sandeep Singh <sandeep.singh@....com>
>
> AMD SFH uses HID over PCIe bus.SFH fw is part of MP2
> processor (MP2 which is an ARM® Cortex-M4 core based
> co-processor to x86) and it runs on MP2 where in driver resides
> on X86. This part of module will communicate with MP2 FW and
> provide that data into DRAM
>
> Signed-off-by: Sandeep Singh <sandeep.singh@....com>
> Signed-off-by: Nehal Shah <Nehal-bakulchandra.Shah@....com>
Why you are submitting code if Nehal's SoB last in the list?
...
> Reported-by: kbuild test robot <lkp@...el.com>
I guess it's not applicable here, since it's a new code. Rather you
may mentioned this in changelog in cover letter.
...
> + write64(0x0, privdata->mmio + AMD_C2P_MSG2);
Hmm... What's write64()? Isn't it writeq()?
...
> + if (ACEL_EN & activestatus) {
> + sensor_id[num_of_sensors] = ACCEL_IDX;
> + num_of_sensors++;
> + }
You can drop a lot of LOCs by doing
if (ACEL_EN & activestatus)
sensor_id[num_of_sensors++] = ACCEL_IDX;
...
> + rc = pcim_iomap_regions(pdev, BIT(2), DRIVER_NAME);
> + if (rc)
> + goto err_pci_enable;
Due to use of PCI managed functions error path is not needed at all.
Return directly.
...
> + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
> + if (rc) {
> + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
> + if (rc)
> + goto err_dma_mask;
> + }
rc = ...;
if (rc)
rc = ...;
if (rc)
return rc;
...
> +err_dma_mask:
> + pci_clear_master(pdev);
PCI managed handling does it for you.
> +err_pci_enable:
> + pci_set_drvdata(pdev, NULL);
Driver code does this for you.
> + return rc;
...
> + dev_info(&pdev->dev, "MP2 device found [%04x:%04x] (rev %x)\n",
> + pdev->vendor, pdev->device, pdev->revision);
How is it useful? PCI core prints a lot of information which you may
find in dmesg.
...
> + privdata = devm_kzalloc(&pdev->dev, sizeof(*privdata), GFP_KERNEL);
> + if (!privdata)
> + rc = -ENOMEM;
How this has been tested?
> + privdata->pdev = pdev;
> + rc = amd_mp2_pci_init(privdata, pdev);
> + if (rc)
> + return rc;
> + return 0;
return amd_mp2_pci_init(...);
...
> +static void amd_mp2_pci_remove(struct pci_dev *pdev)
> +{
> + struct amd_mp2_dev *privdata = pci_get_drvdata(pdev);
> +
> + amd_stop_all_sensors(privdata->pdev);
> + pci_clear_master(pdev);
> + pci_set_drvdata(pdev, NULL);
Same comments as per error path in the ->probe()
> +}
...
> +static const struct pci_device_id amd_mp2_pci_tbl[] = {
> + {PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2)},
Spaces, please,
{ PCI...() },
> + {0}
0 is not needed here.
> +};
...
> +#ifndef PCIE_MP2_AMD_H
> +#define PCIE_MP2_AMD_H
+ empty line
> +#include <linux/io-64-nonatomic-lo-hi.h>
> +#include <linux/pci.h>
> +#include <linux/types.h>
> +#define PCI_DEVICE_ID_AMD_MP2 0x15E4
Why not in the C file?
> +/* MP2 C2P Message Registers */
> +#define AMD_C2P_MSG0 0x10500
> +#define AMD_C2P_MSG1 0x10504
> +#define AMD_C2P_MSG2 0x10508
> +#define AMD_C2P_MSG3 0x1050c
> +#define AMD_C2P_MSG4 0x10510
> +#define AMD_C2P_MSG5 0x10514
> +#define AMD_C2P_MSG6 0x10518
> +#define AMD_C2P_MSG7 0x1051c
> +#define AMD_C2P_MSG8 0x10520
> +#define AMD_C2P_MSG9 0x10524
> +
> +/* MP2 P2C Message Registers */
> +#define AMD_P2C_MSG0 0x10680 /*Do not use*/
> +#define AMD_P2C_MSG1 0x10684
> +#define AMD_P2C_MSG2 0x10688
> +#define AMD_P2C_MSG3 0x1068C /*MP2 debug info*/
> +#define AMD_P2C_MSG_INTEN 0x10690 /*MP2 int gen register*/
> +#define AMD_P2C_MSG_INTSTS 0x10694 /*Interrupt sts*/
Do you need all these in the header?
...
> +#define write64 lo_hi_writeq
> +#define read64 lo_hi_readq
Why?! You have writeq() definition or use lo_hi_*() directly.
...
> +int amd_mp2_get_sensor_num(struct pci_dev *dev, u8 *sensor_id);
+ blank line
> +#endif
--
With Best Regards,
Andy Shevchenko
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