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PCI: rcar-gen4: Add .speed_control() callback

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Introduce new rcar_gen4_pcie_drvdata->speed_control() callback and
implement it on R-Car Gen4. The callback implements the second half of what
is currently present in rcar_gen4_pcie_start_link(), and
rcar_gen4_pcie_start_link() does call the .speed_control() callback. This
is a preparatory work for R-Car Gen5 support, where the .speed_control()
implementation is different.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[mani: commit log]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260921202823.72620-5-marek.vasut+renesas@mailbox.org
This commit is contained in:
Marek Vasut 2026-09-21 22:27:46 +02:00 committed by Bjorn Helgaas
parent a9b2dc6de8
commit bb0cf158cf
1 changed files with 26 additions and 13 deletions
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39
drivers/pci/controller/dwc/pcie-rcar-gen4.c
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@ -90,6 +90,7 @@ struct rcar_gen4_pcie_drvdata {
int (*init)(struct rcar_gen4_pcie *rcar);
void (*deinit)(struct rcar_gen4_pcie *rcar);
int (*ltssm_control)(struct rcar_gen4_pcie *rcar, bool enable);
int (*speed_control)(struct rcar_gen4_pcie *rcar);
enum dw_pcie_device_mode mode;
};
@ -141,20 +142,10 @@ static int rcar_gen4_pcie_speed_change(struct dw_pcie *dw)
return -ETIMEDOUT;
}
/*
* Enable LTSSM of this controller and manually initiate the speed change.
* Always return 0.
*/
static int rcar_gen4_pcie_start_link(struct dw_pcie *dw)
static int rcar_gen4_pcie_speed_control(struct rcar_gen4_pcie *rcar)
{
struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
int i, changes, ret;
if (rcar->drvdata->ltssm_control) {
ret = rcar->drvdata->ltssm_control(rcar, true);
if (ret)
return ret;
}
struct dw_pcie *dw = &rcar->dw;
int i, changes;
/*
* Require direct speed change with retrying here if the max_link_speed
@ -178,6 +169,24 @@ static int rcar_gen4_pcie_start_link(struct dw_pcie *dw)
return 0;
}
/*
* Enable LTSSM of this controller and manually initiate the speed change.
* Always return 0.
*/
static int rcar_gen4_pcie_start_link(struct dw_pcie *dw)
{
struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
int ret;
if (rcar->drvdata->ltssm_control) {
ret = rcar->drvdata->ltssm_control(rcar, true);
if (ret)
return ret;
}
return rcar->drvdata->speed_control(rcar);
}
static void rcar_gen4_pcie_stop_link(struct dw_pcie *dw)
{
struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
@ -916,6 +925,7 @@ static struct rcar_gen4_pcie_drvdata drvdata_r8a779f0_pcie = {
.init = rcar_gen4_pcie_common_init,
.deinit = rcar_gen4_pcie_common_deinit,
.ltssm_control = r8a779f0_pcie_ltssm_control,
.speed_control = rcar_gen4_pcie_speed_control,
.mode = DW_PCIE_RC_TYPE,
};
@ -923,6 +933,7 @@ static struct rcar_gen4_pcie_drvdata drvdata_r8a779f0_pcie_ep = {
.init = rcar_gen4_pcie_common_init,
.deinit = rcar_gen4_pcie_common_deinit,
.ltssm_control = r8a779f0_pcie_ltssm_control,
.speed_control = rcar_gen4_pcie_speed_control,
.mode = DW_PCIE_EP_TYPE,
};
@ -930,6 +941,7 @@ static struct rcar_gen4_pcie_drvdata drvdata_rcar_gen4_pcie = {
.init = rcar_gen4_v4h_v4m_pcie_init,
.deinit = rcar_gen4_pcie_common_deinit,
.ltssm_control = rcar_gen4_pcie_ltssm_control,
.speed_control = rcar_gen4_pcie_speed_control,
.mode = DW_PCIE_RC_TYPE,
};
@ -937,6 +949,7 @@ static struct rcar_gen4_pcie_drvdata drvdata_rcar_gen4_pcie_ep = {
.init = rcar_gen4_v4h_v4m_pcie_init,
.deinit = rcar_gen4_pcie_common_deinit,
.ltssm_control = rcar_gen4_pcie_ltssm_control,
.speed_control = rcar_gen4_pcie_speed_control,
.mode = DW_PCIE_EP_TYPE,
};