lkml.org 
[lkml]   [2017]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH 2/2] i2c: xgene-slimpro: Add ACPI support by using PCC mailbox
Hi Wolfram,

On Thu, Apr 20, 2017 at 1:05 AM, Wolfram Sang <wsa@the-dreams.de> wrote:
> Hi,
>
> have you tested these patches also without PCC? So, we can be sure there
> is no regression?

These patches are tested with/without PCC.

>
>> diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
>> index 96545aa..a5771c1 100644
>> --- a/drivers/i2c/busses/i2c-xgene-slimpro.c
>> +++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
>> @@ -32,6 +32,8 @@
>> #include <linux/platform_device.h>
>> #include <linux/version.h>
>>
>> +#include <acpi/pcc.h>
>> +
>
> Please keep it sorted alphabetically.
>
>> +#define PCC_CMD_GENERATE_DB_INT BIT(15)
>> +#define PCC_STS_CMD_COMPLETE BIT(0)
>> +#define PCC_STS_SCI_DOORBELL BIT(1)
>> +#define PCC_STS_ERR BIT(2)
>> +#define PCC_STS_PLAT_NOTIFY BIT(3)
>
> Please keep it sorted by number.
>
>> + if (!acpi_disabled) {
>> + mutex_lock(&ctx->tx_mutex);
>> + init_completion(&ctx->rd_complete);
>
> reinit_completion?

OK,

>
>> + slimpro_i2c_pcc_tx_prepare(ctx, msg);
>> + }
>> +
>> + mutex_init(&ctx->tx_mutex);
>
> Why this mutex, by the way? The i2c-core serializes access to the
> adapter. Maybe I am missing something?

That's a good point, let me remove this mutex.

>
>> + cppc_ss = ctx->mbox_chan->con_priv;
>> + if (!cppc_ss) {
>> + dev_err(&pdev->dev, "PPC subspace not found\n");
>> + rc = -ENODEV;
>> + goto mbox_err;
>> + }
>> +
>> + if (!ctx->mbox_chan->mbox->txdone_irq) {
>> + dev_err(&pdev->dev, "PCC IRQ not supported\n");
>> + rc = -ENODEV;
>> + goto mbox_err;
>> + }
>>
>> + /*
>> + * This is the shared communication region
>> + * for the OS and Platform to communicate over.
>> + */
>> + ctx->comm_base_addr = cppc_ss->base_address;
>> + if (ctx->comm_base_addr) {
>> + ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
>> + cppc_ss->length,
>> + MEMREMAP_WB);
>> + } else {
>> + dev_err(&pdev->dev, "Failed to get PCC comm region\n");
>> + rc = -ENODEV;
>> + goto mbox_err;
>> + }
>
> I think it doesn't make sense to print a dev_err and return ENODEV which
> is treated by the driver core as a non-error. It means "not present, but
> OK". You probably want other error codes here.

How about -EINVAL for these -ENODEV error codes? Do you have any suggestion?

Thank for your comments!
Hoan


>
> Regards,
>
> Wolfram
>

\
 
 \ /
  Last update: 2017-04-20 22:39    [W:0.051 / U:1.608 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site