On Tue, Feb 25, 2025 at 10:59 AM Claudiu <claudiu.beznea@xxxxxxxxx> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
>
> It has been observed on the Renesas RZ/G3S SoC that unbinding and binding
> the PHY driver leads to role autodetection failures. This issue occurs when
> PHY 3 is the first initialized PHY. PHY 3 does not have an interrupt
> associated with the USB2_INT_ENABLE register (as
> rcar_gen3_int_enable[3] = 0). As a result, rcar_gen3_init_otg() is called
> to initialize OTG without enabling PHY interrupts.
>
> To resolve this, add rcar_gen3_is_any_otg_rphy_initialized() and call it in
> role_store(), role_show(), and rcar_gen3_init_otg(). At the same time,
> rcar_gen3_init_otg() is only called when initialization for a PHY with
> interrupt bits is in progress. As a result, the
> struct rcar_gen3_phy::otg_initialized is no longer needed.
>
> Fixes: 549b6b55b005 ("phy: renesas: rcar-gen3-usb2: enable/disable independent irqs")
> Cc: stable@xxxxxxxxxxxxxxx
> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> ---
>
> Changes in v2:
> - collected tags
>
> drivers/phy/renesas/phy-rcar-gen3-usb2.c | 33 ++++++++++--------------
> 1 file changed, 14 insertions(+), 19 deletions(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Cheers,
Prabhakar
> diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> index 775f4f973a6c..46afba2fe0dc 100644
> --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> @@ -107,7 +107,6 @@ struct rcar_gen3_phy {
> struct rcar_gen3_chan *ch;
> u32 int_enable_bits;
> bool initialized;
> - bool otg_initialized;
> bool powered;
> };
>
> @@ -320,16 +319,15 @@ static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
> return false;
> }
>
> -static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
> +static bool rcar_gen3_is_any_otg_rphy_initialized(struct rcar_gen3_chan *ch)
> {
> - int i;
> -
> - for (i = 0; i < NUM_OF_PHYS; i++) {
> - if (ch->rphys[i].otg_initialized)
> - return false;
> + for (enum rcar_gen3_phy_index i = PHY_INDEX_BOTH_HC; i <= PHY_INDEX_EHCI;
> + i++) {
> + if (ch->rphys[i].initialized)
> + return true;
> }
>
> - return true;
> + return false;
> }
>
> static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
> @@ -351,7 +349,7 @@ static ssize_t role_store(struct device *dev, struct device_attribute *attr,
> bool is_b_device;
> enum phy_mode cur_mode, new_mode;
>
> - if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
> + if (!ch->is_otg_channel || !rcar_gen3_is_any_otg_rphy_initialized(ch))
> return -EIO;
>
> if (sysfs_streq(buf, "host"))
> @@ -389,7 +387,7 @@ static ssize_t role_show(struct device *dev, struct device_attribute *attr,
> {
> struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
>
> - if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
> + if (!ch->is_otg_channel || !rcar_gen3_is_any_otg_rphy_initialized(ch))
> return -EIO;
>
> return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
> @@ -402,6 +400,9 @@ static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
> void __iomem *usb2_base = ch->base;
> u32 val;
>
> + if (!ch->is_otg_channel || rcar_gen3_is_any_otg_rphy_initialized(ch))
> + return;
> +
> /* Should not use functions of read-modify-write a register */
> val = readl(usb2_base + USB2_LINECTRL1);
> val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
> @@ -465,12 +466,9 @@ static int rcar_gen3_phy_usb2_init(struct phy *p)
> writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
> writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
>
> - /* Initialize otg part */
> - if (channel->is_otg_channel) {
> - if (rcar_gen3_needs_init_otg(channel))
> - rcar_gen3_init_otg(channel);
> - rphy->otg_initialized = true;
> - }
> + /* Initialize otg part (only if we initialize a PHY with IRQs). */
> + if (rphy->int_enable_bits)
> + rcar_gen3_init_otg(channel);
>
> rphy->initialized = true;
>
> @@ -486,9 +484,6 @@ static int rcar_gen3_phy_usb2_exit(struct phy *p)
>
> rphy->initialized = false;
>
> - if (channel->is_otg_channel)
> - rphy->otg_initialized = false;
> -
> val = readl(usb2_base + USB2_INT_ENABLE);
> val &= ~rphy->int_enable_bits;
> if (!rcar_gen3_is_any_rphy_initialized(channel))
> --
> 2.43.0
>
>
