On Tue, May 22, 2018 at 02:24:20PM +0200, Marek Vasut wrote:
> The data link active signal usually takes ~20 uSec to be asserted,
> poll the bit more often to avoid useless delays in this function.
> Use udelay() instead of usleep() for such a small delay as suggested
> by the timer documentation and because this will be used in atomic
> context later on when the suspend/resume patches land.
>
> Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxx>
> Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Cc: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> Cc: Simon Horman <horms+renesas@xxxxxxxxxxxx>
> Cc: Wolfram Sang <wsa@xxxxxxxxxxxxx>
> Cc: linux-renesas-soc@xxxxxxxxxxxxxxx
> ---
> V2: s/content/context in commit message
> V3: Add cpu_relax()
> ---
> drivers/pci/host/pcie-rcar.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Applied to pci/rcar for v4.18, thanks.
Lorenzo
> diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
> index 5c365f743df5..3aa6fe5f2d64 100644
> --- a/drivers/pci/host/pcie-rcar.c
> +++ b/drivers/pci/host/pcie-rcar.c
> @@ -529,13 +529,14 @@ static void phy_write_reg(struct rcar_pcie *pcie,
>
> static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
> {
> - unsigned int timeout = 10;
> + unsigned int timeout = 10000;
>
> while (timeout--) {
> if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
> return 0;
>
> - msleep(5);
> + udelay(5);
> + cpu_relax();
> }
>
> return -ETIMEDOUT;
> --
> 2.16.2
>
