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SubjectRe: [spi-devel-general] [PATCH][2.16.17-rc1-mm2] spi: Added spi master driver for Freescale MPC83xx SPI controller
Hi,

Kumar Gala wrote:

>+irqreturn_t mpc83xx_spi_irq(s32 irq, void *context_data,
>+ struct pt_regs * ptregs)
>+{
>+ struct mpc83xx_spi *mpc83xx_spi = context_data;
>+ u32 event;
>+ irqreturn_t ret = IRQ_NONE;
>+
>+ /* Get interrupt events(tx/rx) */
>+ event = mpc83xx_spi_read_reg(&mpc83xx_spi->base->event);
>+
>+ /* We need handle RX first */
>+ if (event & SPIE_NE) {
>+ u32 rx_data = mpc83xx_spi_read_reg(&mpc83xx_spi->base->receive);
>+
>+ if (mpc83xx_spi->rx)
>+ mpc83xx_spi->get_rx(rx_data, mpc83xx_spi);
>+
>+ ret = IRQ_HANDLED;
>+ }
>+
>+ if ((event & SPIE_NF) == 0)
>+ /* spin until TX is done */
>+ while (((event =
>+ mpc83xx_spi_read_reg(&mpc83xx_spi->base->event)) &
>+ SPIE_NF) == 0)
>+ ;
>
>
This is a potentially endless loop so two questions here.
First, did you do any measurements on how long it can loop here?
The, what if a bus error occurs and this bit is never set?

>+
>+ mpc83xx_spi->count -= 1;
>+ if (mpc83xx_spi->count) {
>+ if (mpc83xx_spi->tx) {
>+ u32 word = mpc83xx_spi->get_tx(mpc83xx_spi);
>+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit,
>+ word);
>+ }
>+ } else {
>+ complete(&mpc83xx_spi->done);
>+ }
>
>
So, if it's not SPIE_NF, it's not marked as HANDLED?

Vitaly
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