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phy: cadence-torrent: Check total lane count for all subnodes is within limit

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Add checking if total number of lanes for all subnodes is not greater than
number of lanes supported by PHY.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/1600280911-9214-6-git-send-email-sjakhade@cadence.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Swapnil Jakhade 2020-09-16 20:28:29 +02:00 committed by Vinod Koul
parent 2e70c84995
commit d09945eaca
1 changed files with 15 additions and 4 deletions
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19
drivers/phy/cadence/phy-cadence-torrent.c
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@ -25,7 +25,6 @@
#define REF_CLK_19_2MHz 19200000
#define REF_CLK_25MHz 25000000
#define DEFAULT_NUM_LANES 4
#define MAX_NUM_LANES 4
#define DEFAULT_MAX_BIT_RATE 8100 /* in Mbps */
@ -1734,6 +1733,7 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
const struct cdns_torrent_data *data;
struct device_node *child;
int ret, subnodes, node = 0, i;
u32 total_num_lanes = 0;
u8 init_dp_regmap = 0;
/* Get init data for this PHY */
@ -1808,9 +1808,15 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
goto put_child;
}
cdns_phy->phys[node].num_lanes = DEFAULT_NUM_LANES;
of_property_read_u32(child, "cdns,num-lanes",
&cdns_phy->phys[node].num_lanes);
if (of_property_read_u32(child, "cdns,num-lanes",
&cdns_phy->phys[node].num_lanes)) {
dev_err(dev, "%s: No \"cdns,num-lanes\"-property.\n",
child->full_name);
ret = -EINVAL;
goto put_child;
}
total_num_lanes += cdns_phy->phys[node].num_lanes;
if (cdns_phy->phys[node].phy_type == PHY_TYPE_DP) {
switch (cdns_phy->phys[node].num_lanes) {
@ -1890,6 +1896,11 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
}
cdns_phy->nsubnodes = node;
if (total_num_lanes > MAX_NUM_LANES) {
dev_err(dev, "Invalid lane configuration\n");
goto put_lnk_rst;
}
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (IS_ERR(phy_provider)) {
ret = PTR_ERR(phy_provider);