PCI: endpoint: Add support to poll early for host commands

Certain platforms like TI's K2G doesn't support link-up notification. Add
support to poll early (without waiting for the linkup notification) for
commands from the host.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index e378dae9e51026ec8b0b03815cfb4f448db91b09..a0aea2500690bf07626b1dff3c86038da3b0e1ff 100644 (file)
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -55,6 +55,7 @@ struct pci_epf_test {
        void                    *reg[6];
        struct pci_epf          *epf;
        enum pci_barno          test_reg_bar;
+       bool                    linkup_notifier;
        struct delayed_work     cmd_handler;
 };
 
@@ -77,6 +78,7 @@ static struct pci_epf_header test_header = {
 
 struct pci_epf_test_data {
        enum pci_barno  test_reg_bar;
+       bool            linkup_notifier;
 };
 
 static int bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
@@ -424,6 +426,7 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
 static int pci_epf_test_bind(struct pci_epf *epf)
 {
        int ret;
+       struct pci_epf_test *epf_test = epf_get_drvdata(epf);
        struct pci_epf_header *header = epf->header;
        struct pci_epc *epc = epf->epc;
        struct device *dev = &epf->dev;
@@ -449,6 +452,9 @@ static int pci_epf_test_bind(struct pci_epf *epf)
        if (ret)
                return ret;
 
+       if (!epf_test->linkup_notifier)
+               queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);
+
        return 0;
 }
 
@@ -466,11 +472,14 @@ static int pci_epf_test_probe(struct pci_epf *epf)
        const struct pci_epf_device_id *match;
        struct pci_epf_test_data *data;
        enum pci_barno test_reg_bar = BAR_0;
+       bool linkup_notifier = true;
 
        match = pci_epf_match_device(pci_epf_test_ids, epf);
        data = (struct pci_epf_test_data *)match->driver_data;
-       if (data)
+       if (data) {
                test_reg_bar = data->test_reg_bar;
+               linkup_notifier = data->linkup_notifier;
+       }
 
        epf_test = devm_kzalloc(dev, sizeof(*epf_test), GFP_KERNEL);
        if (!epf_test)
@@ -479,6 +488,7 @@ static int pci_epf_test_probe(struct pci_epf *epf)
        epf->header = &test_header;
        epf_test->epf = epf;
        epf_test->test_reg_bar = test_reg_bar;
+       epf_test->linkup_notifier = linkup_notifier;
 
        INIT_DELAYED_WORK(&epf_test->cmd_handler, pci_epf_test_cmd_handler);