| Message ID | 20220412094029.287562-2-herve.codina@bootlin.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | RZN1 USB Host support | expand |
On Tue, Apr 12, 2022 at 11:40:24AM +0200, Herve Codina wrote: > The PCI rcar-gen2 does not call any clk_prepare_enable(). > This lead to an access failure when the driver tries to access > the IP (at least on a RZ/N1D platform). > > Prepare and enable clocks using the bulk version of > clk_prepare_enable() in order to prepare and enable all clocks > attached to this device. The binding says there is only a single clock, so it needs an update if there are multiple clocks. (And ideally converted to DT schema format.) Rob
Hi Rob, On Tue, 12 Apr 2022 10:50:10 -0500 Rob Herring <robh@kernel.org> wrote: > On Tue, Apr 12, 2022 at 11:40:24AM +0200, Herve Codina wrote: > > The PCI rcar-gen2 does not call any clk_prepare_enable(). > > This lead to an access failure when the driver tries to access > > the IP (at least on a RZ/N1D platform). > > > > Prepare and enable clocks using the bulk version of > > clk_prepare_enable() in order to prepare and enable all clocks > > attached to this device. > > The binding says there is only a single clock, so it needs an update if > there are multiple clocks. (And ideally converted to DT schema format.) Indeed, I will convert to DT schema format and update the clocks property description. Regards, Hervé
diff --git a/drivers/pci/controller/pci-rcar-gen2.c b/drivers/pci/controller/pci-rcar-gen2.c index 35804ea394fd..528bc3780e01 100644 --- a/drivers/pci/controller/pci-rcar-gen2.c +++ b/drivers/pci/controller/pci-rcar-gen2.c @@ -8,6 +8,7 @@ * Author: Valentine Barshak <valentine.barshak@cogentembedded.com> */ +#include <linux/clk.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> @@ -99,6 +100,8 @@ struct rcar_pci { struct resource mem_res; struct resource *cfg_res; int irq; + struct clk_bulk_data *clocks; + int nclocks; }; /* PCI configuration space operations */ @@ -282,6 +285,7 @@ static int rcar_pci_probe(struct platform_device *pdev) struct rcar_pci *priv; struct pci_host_bridge *bridge; void __iomem *reg; + int ret; bridge = devm_pci_alloc_host_bridge(dev, sizeof(*priv)); if (!bridge) @@ -305,13 +309,25 @@ static int rcar_pci_probe(struct platform_device *pdev) priv->mem_res = *mem_res; priv->cfg_res = cfg_res; + ret = devm_clk_bulk_get_all(dev, &priv->clocks); + if (ret < 0) { + dev_err(dev, "failed to get clocks %d\n", ret); + return ret; + } + priv->nclocks = ret; + + ret = clk_bulk_prepare_enable(priv->nclocks, priv->clocks); + if (ret) + return ret; + priv->irq = platform_get_irq(pdev, 0); priv->reg = reg; priv->dev = dev; if (priv->irq < 0) { dev_err(dev, "no valid irq found\n"); - return priv->irq; + ret = priv->irq; + goto disable_clocks; } bridge->ops = &rcar_pci_ops; @@ -320,7 +336,15 @@ static int rcar_pci_probe(struct platform_device *pdev) rcar_pci_setup(priv); - return pci_host_probe(bridge); + ret = pci_host_probe(bridge); + if (ret < 0) + goto disable_clocks; + + return 0; + +disable_clocks: + clk_bulk_disable_unprepare(priv->nclocks, priv->clocks); + return ret; } static const struct of_device_id rcar_pci_of_match[] = {
The PCI rcar-gen2 does not call any clk_prepare_enable(). This lead to an access failure when the driver tries to access the IP (at least on a RZ/N1D platform). Prepare and enable clocks using the bulk version of clk_prepare_enable() in order to prepare and enable all clocks attached to this device. Signed-off-by: Herve Codina <herve.codina@bootlin.com> --- drivers/pci/controller/pci-rcar-gen2.c | 28 ++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-)