On Mon, Jan 27, 2014 at 4:55 PM, Bjorn Helgaas [off-list ref] wrote:

We're only seeing Arnd's side of the conversation on linux-pci.
Tanmay, are your messages being rejected because they're too "fancy",
per the definition here: http://vger.kernel.org/majordomo-info.html ?

Thanks for pointing out. I am not sure though what's being detected as
fancy. I checked that my emails are received as plaintext on
majordomo. They are also displayed fine on LKML.

In this email, I have tried to keep the format of to: and cc: same as
first email in the thread. Not sure if this fixes the problem.

Again.. sorry for spamming.

On Sat, Jan 25, 2014 at 1:11 PM, Arnd Bergmann [off-list ref] wrote:

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On Friday 24 January 2014 13:28:22 Tanmay Inamdar wrote:

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On Thu, Jan 16, 2014 at 5:10 PM, Tanmay Inamdar [off-list ref] wrote:

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On Wed, Jan 15, 2014 at 4:39 AM, Arnd Bergmann [off-list ref] wrote:

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On Wednesday 15 January 2014, Tanmay Inamdar wrote:

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+static void xgene_pcie_poll_linkup(struct xgene_pcie_port *port, u32 *lanes)
+{
+     void *csr_base = port->csr_base;
+     u32 val32;
+     u64 start_time, time;
+
+     /*
+      * A component enters the LTSSM Detect state within
+      * 20ms of the end of fundamental core reset.
+      */
+     msleep(XGENE_LTSSM_DETECT_WAIT);
+     port->link_up = 0;
+     start_time = jiffies;
+     do {
+             val32 = readl(csr_base + PCIECORE_CTLANDSTATUS);
+             if (val32 & LINK_UP_MASK) {
+                     port->link_up = 1;
+                     port->link_speed = PIPE_PHY_RATE_RD(val32);
+                     val32 = readl(csr_base + BRIDGE_STATUS_0);
+                     *lanes = val32 >> 26;
+             }
+             time = jiffies_to_msecs(jiffies - start_time);
+     } while ((!port->link_up) || (time <= XGENE_LTSSM_L0_WAIT));
+}

Maybe another msleep() in the loop? It seems weird to first do an
unconditional sleep but then busy-wait for the result.

ok.

This loop can execute for maximum 4 msec. So putting msleep(1) won't
get us much.

4 msec is still quite a long time for a busy loop that can be spent doing
useful work in another thread.

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Another general note: Your "compatible" strings are rather unspecific.
Do you have a version number for this IP block? I suppose that it's related
to one that has been used in other chips before, or will be used in future
chips, if it's not actually licensed from some other company.

I will have to check this.

We have decided to stick with current compatible string for now.

Can you elaborate on your reasoning? Does this mean X-Gene is a one-off
product and you won't be doing any new chips based on the same hardware
components?

        Arnd