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spi: mpc52xx-psc: Switch to using core message queue

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We deprecated open coding of the transfer queue back in 2017 so it's high
time we finished up converting drivers to use the standard message queue
code. The mpc52xx-psc driver is fairly straightforward so convert to use
transfer_one_message(), it looks like the driver would be a good fit for
transfer_one() with a little bit of updating but this smaller change seems
safer.

The driver seems like a good candidate for transfer_one() but the chip
select function is actually doing rather more than just updating the chip
select and both transfer_one() and transfer_one_message() are current APIs
so leave that refactoring for another day, ideally by someone with the
hardware.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220613121946.136193-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2022-06-13 13:19:46 +01:00
parent e2185072a4
commit 145cfc3840
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 35 additions and 83 deletions
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60
drivers/spi/spi-mpc52xx-psc.c
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@ -37,12 +37,6 @@ struct mpc52xx_psc_spi {
struct mpc52xx_psc_fifo __iomem *fifo;
unsigned int irq;
u8 bits_per_word;
u8 busy;
struct work_struct work;
struct list_head queue;
spinlock_t lock;
struct completion done;
};
@ -198,24 +192,14 @@ static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
return 0;
}
static void mpc52xx_psc_spi_work(struct work_struct *work)
int mpc52xx_psc_spi_transfer_one_message(struct spi_controller *ctlr,
struct spi_message *m)
{
struct mpc52xx_psc_spi *mps =
container_of(work, struct mpc52xx_psc_spi, work);
spin_lock_irq(&mps->lock);
mps->busy = 1;
while (!list_empty(&mps->queue)) {
struct spi_message *m;
struct spi_device *spi;
struct spi_transfer *t = NULL;
unsigned cs_change;
int status;
m = container_of(mps->queue.next, struct spi_message, queue);
list_del_init(&m->queue);
spin_unlock_irq(&mps->lock);
spi = m->spi;
cs_change = 1;
status = 0;
@ -242,25 +226,19 @@ static void mpc52xx_psc_spi_work(struct work_struct *work)
}
m->status = status;
if (m->complete)
m->complete(m->context);
if (status || !cs_change)
mpc52xx_psc_spi_deactivate_cs(spi);
mpc52xx_psc_spi_transfer_setup(spi, NULL);
spin_lock_irq(&mps->lock);
}
mps->busy = 0;
spin_unlock_irq(&mps->lock);
spi_finalize_current_message(ctlr);
return 0;
}
static int mpc52xx_psc_spi_setup(struct spi_device *spi)
{
struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
unsigned long flags;
if (spi->bits_per_word%8)
return -EINVAL;
@ -275,28 +253,6 @@ static int mpc52xx_psc_spi_setup(struct spi_device *spi)
cs->bits_per_word = spi->bits_per_word;
cs->speed_hz = spi->max_speed_hz;
spin_lock_irqsave(&mps->lock, flags);
if (!mps->busy)
mpc52xx_psc_spi_deactivate_cs(spi);
spin_unlock_irqrestore(&mps->lock, flags);
return 0;
}
static int mpc52xx_psc_spi_transfer(struct spi_device *spi,
struct spi_message *m)
{
struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
unsigned long flags;
m->actual_length = 0;
m->status = -EINPROGRESS;
spin_lock_irqsave(&mps->lock, flags);
list_add_tail(&m->queue, &mps->queue);
schedule_work(&mps->work);
spin_unlock_irqrestore(&mps->lock, flags);
return 0;
}
@ -391,7 +347,7 @@ static int mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
master->num_chipselect = pdata->max_chipselect;
}
master->setup = mpc52xx_psc_spi_setup;
master->transfer = mpc52xx_psc_spi_transfer;
master->transfer_one_message = mpc52xx_psc_spi_transfer_one_message;
master->cleanup = mpc52xx_psc_spi_cleanup;
master->dev.of_node = dev->of_node;
@ -415,10 +371,7 @@ static int mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
goto free_irq;
}
spin_lock_init(&mps->lock);
init_completion(&mps->done);
INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
INIT_LIST_HEAD(&mps->queue);
ret = spi_register_master(master);
if (ret < 0)
@ -470,7 +423,6 @@ static int mpc52xx_psc_spi_of_remove(struct platform_device *op)
struct spi_master *master = spi_master_get(platform_get_drvdata(op));
struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
flush_work(&mps->work);
spi_unregister_master(master);
free_irq(mps->irq, mps);
if (mps->psc)