On 12-Dec-17 5:02 PM, Lorenzo Pieralisi wrote:
> On Mon, Oct 30, 2017 at 07:27:12PM +0530, Manikanta Maddireddy wrote:
>> This patch ensures that LTSSM is started (by deasserting pcie_xrst) only
>> after all the required root port register programming is completed.
>>
>> Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx>
>> ---
>> V3:
>> * no change in this patch
>> V2:
>> * no change in this patch
>>
>> drivers/pci/host/pci-tegra.c | 9 +++++----
>> 1 file changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
>> index 96e8038c3019..b41c60c7414c 100644
>> --- a/drivers/pci/host/pci-tegra.c
>> +++ b/drivers/pci/host/pci-tegra.c
>> @@ -1024,9 +1024,6 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
>> }
>> }
>>
>> - /* take the PCIe interface module out of reset */
>> - reset_control_deassert(pcie->pcie_xrst);
>> -
>> /* finally enable PCIe */
>> value = afi_readl(pcie, AFI_CONFIGURATION);
>> value |= AFI_CONFIGURATION_EN_FPCI;
>> @@ -1065,7 +1062,6 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie)
>> dev_err(dev, "failed to power off PHY(s): %d\n", err);
>> }
>>
>> - reset_control_assert(pcie->pcie_xrst);
>
> This does not look like it is part of the reset de-assertion code move.
>
> tegra_pcie_enable_controller() -> tegra_pcie_enable_ports()
>
> in other words, why are you removing it ?
>
> Lorenzo
Hi Lorenzo,
Host driver should start LTSSM after programming all controller registers.
In tegra_pcie_enable_controller() bunch of AFI module programming is done and
I am adding PCIe register programming in this series.
So I moved deasserting of pcie_xrst(which starts LTSSM) to tegra_pcie_enable_ports(),
which is right after sending RST pulse(tegra_pcie_port_reset()) to endpoint.
>
>> reset_control_assert(pcie->afi_rst);
>> reset_control_assert(pcie->pex_rst);
>>
>> @@ -2116,7 +2112,12 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
>> port->index, port->lanes);
>>
>> tegra_pcie_port_enable(port);
>> + }
>>
>> + /* take the PCIe interface module out of reset */
>> + reset_control_deassert(pcie->pcie_xrst);
>> +
>> + list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
>> if (tegra_pcie_port_check_link(port))
>> continue;
>>
>> --
>> 2.1.4
>>
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