On 06/19/2012 12:06 AM, Laxman Dewangan wrote:
> The Tegra20 HW issue with accessing APBIO registers (such
> as fuse registers) directly from the CPU concurrently with
> APB DMA accesses has been fixed in Tegra30 and later chips.
>
> Access these registers directly from the CPU on Tegra30
> and later, and apply the workaround only for Tegra20.
> +void tegra_apb_io_init(void)
> +{
> + /* Need to use dma only when it is Tegra20 based platform */
> + if (of_machine_is_compatible("nvidia,tegra20")) {
That tests only works when the system is booted using device tree. Can
you change this to:
if (of_machine_is_compatible("nvidia,tegra20") ||
!of_have_populated_dt()) {
... and make sure you get the expected result when booting using a board
file (e.g. Harmony). Thanks.
> + apbio_read = tegra_apb_readl_using_dma;
> + apbio_write = tegra_apb_writel_using_dma;
> + } else {
> + apbio_read = tegra_apb_readl_direct;
> + apbio_write = tegra_apb_writel_direct;
> + }
> +}
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