Commit a1f67bc1 authored by Christian Gmeiner's avatar Christian Gmeiner Committed by Lorenzo Pieralisi
Browse files

PCI: cadence: Allow PTM Responder to be enabled 

This enables the Controller [RP] to automatically respond with
Response/ResponseD messages if CDNS_PCIE_LM_TPM_CTRL_PTMRSEN
and PCI_PTM_CTRL_ENABLE bits are both set.

Link: https://lore.kernel.org/r/20220512055539.1782437-1-christian.gmeiner@gmail.com


Signed-off-by: default avatarChristian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 0aa3a093

drivers/pci/controller/cadence/pcie-cadence-host.c

+10 −0
Original line number Diff line number Diff line
@@ -123,6 +123,14 @@ static int cdns_pcie_retrain(struct cdns_pcie *pcie) 
	return ret;

}



static void cdns_pcie_host_enable_ptm_response(struct cdns_pcie *pcie)

{

	u32 val;



	val = cdns_pcie_readl(pcie, CDNS_PCIE_LM_PTM_CTRL);

	cdns_pcie_writel(pcie, CDNS_PCIE_LM_PTM_CTRL, val | CDNS_PCIE_LM_TPM_CTRL_PTMRSEN);

}



static int cdns_pcie_host_start_link(struct cdns_pcie_rc *rc)

{

	struct cdns_pcie *pcie = &rc->pcie;
@@ -501,6 +509,8 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc) 
	if (rc->quirk_detect_quiet_flag)

		cdns_pcie_detect_quiet_min_delay_set(&rc->pcie);



	cdns_pcie_host_enable_ptm_response(pcie);



	ret = cdns_pcie_start_link(pcie);

	if (ret) {

		dev_err(dev, "Failed to start link\n");

drivers/pci/controller/cadence/pcie-cadence.h

+4 −0
Original line number Diff line number Diff line
@@ -116,6 +116,10 @@ 
#define LM_RC_BAR_CFG_APERTURE(bar, aperture)		\

					(((aperture) - 2) << ((bar) * 8))



/* PTM Control Register */

#define CDNS_PCIE_LM_PTM_CTRL 	(CDNS_PCIE_LM_BASE + 0x0da8)

#define CDNS_PCIE_LM_TPM_CTRL_PTMRSEN 	BIT(17)



/*

 * Endpoint Function Registers (PCI configuration space for endpoint functions)

 */