> /*
> * 'process_lock' exists because ocores_process() and
> ocores_process_timeout()
> @@ -239,8 +240,13 @@ static irqreturn_t ocores_isr(int irq, void *dev_id)
> struct ocores_i2c *i2c = dev_id;
> u8 stat = oc_getreg(i2c, OCI2C_STATUS);
>
> - if (!(stat & OCI2C_STAT_IF))
> + if (i2c->flags && SIFIVE_FLAG_POLL) {
Do you really want && here?
> + if (stat & OCI2C_STAT_IF)
> + if (!(stat & OCI2C_STAT_BUSY))
> + return IRQ_NONE;
> + } else if (!(stat & OCI2C_STAT_IF)) {
> return IRQ_NONE;
> + }
>
> ocores_process(i2c, stat);
>
> @@ -356,6 +362,11 @@ static void ocores_process_polling(struct ocores_i2c
> *i2c)
> ret = ocores_isr(-1, i2c);
> if (ret == IRQ_NONE)
> break; /* all messages have been transferred */
> + else {
> + if (i2c->flags && SIFIVE_FLAG_POLL)
And here?
> + if (i2c->state == STATE_DONE)
> + break;
> + }
> }
> }
>
> @@ -406,7 +417,7 @@ static int ocores_xfer(struct i2c_adapter *adap,
> {
> struct ocores_i2c *i2c = i2c_get_adapdata(adap);
>
> - if (i2c->flags & OCORES_FLAG_POLL)
> + if ((i2c->flags & OCORES_FLAG_POLL) || (i2c->flags & SIFIVE_FLAG_POLL))
You can combine this
if ((i2c->flags & (OCORES_FLAG_POLL | SIFIVE_FLAG_POLL))
> return ocores_xfer_polling(adap, msgs, num);
> return ocores_xfer_core(i2c, msgs, num, false);
> }
> @@ -597,6 +608,7 @@ static int ocores_i2c_probe(struct platform_device *pdev)
> {
> struct ocores_i2c *i2c;
> struct ocores_i2c_platform_data *pdata;
> + const struct of_device_id *match;
> struct resource *res;
> int irq;
> int ret;
> @@ -678,13 +690,21 @@ static int ocores_i2c_probe(struct platform_device
> *pdev)
>
> irq = platform_get_irq(pdev, 0);
> if (irq == -ENXIO) {
> - i2c->flags |= OCORES_FLAG_POLL;
> + /*
> + * Set a SIFIVE_FLAG_POLL to enable workaround for FU540
> + * in polling mode interface of i2c-ocore driver.
> + */
> + match = of_match_node(ocores_i2c_match, pdev->dev.of_node);
> + if (match && (long)match->data == TYPE_SIFIVE_REV0)
> + i2c->flags |= SIFIVE_FLAG_POLL;
> + else
> + i2c->flags |= OCORES_FLAG_POLL;
Please take a look at the whole code, and consider if it is better to
set both SIFIVE_FLAG_POLL and OCORES_FLAG_POLL. Maybe rename
SIFIVE_FLAG_POLL to OCORES_FLAG_BROKEN_IRQ_BIT?
Thanks
Andrew
