* Vikram Pandita <vikram.pandita@xxxxxx> [091116 15:00]:
> Empty uart rx fifo read can cause omap to abort
> OMAP silicon affected: OMAP3630, OMAP4430
> OMAP silicon not-affected: omap1/2/3
>
> So pass flag UPF_NO_EMPTY_FIFO_READ in plat_serial8250_port, so that 8250
> driver does not abort on empty rx fifo read
>
> Tested on zoom3(3630) board
This too as it depends on the 1/2 patch.
Tony
> Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
> ---
> arch/arm/mach-omap2/serial.c | 9 ++++++++-
> 1 files changed, 8 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index 2e17b57..669652b 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -624,8 +624,15 @@ void __init omap_serial_early_init(void)
> uart->p = p;
> list_add_tail(&uart->node, &uart_list);
>
> - if (cpu_is_omap44xx())
> + if (cpu_is_omap44xx()) {
> p->irq += 32;
> + /* Do not read empty UART fifo on omap4 */
> + p->flags |= UPF_NO_EMPTY_FIFO_READ;
> + }
> +
> + /* Do not read empty UART fifo on omap3630 */
> + if (cpu_is_omap3630())
> + p->flags |= UPF_NO_EMPTY_FIFO_READ;
>
> omap_uart_enable_clocks(uart);
> }
> --
> 1.6.5.1.69.g36942
>
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