[PATCH AUTOSEL 5.19 57/64] phy: samsung: phy-exynos-pcie: sanitize init/power_on callbacks

Sasha Levin
2022-08-14T15:34:15Z

From: Marek Szyprowski <m.szyprowski@samsung.com>

[ Upstream commit f2812227bb07e2eaee74253f11cea1576945df31 ]

The exynos-pcie driver called phy_power_on() before phy_init() for some
historical reasons. However the generic PHY framework assumes that the
proper sequence is to call phy_init() first, then phy_power_on(). The
operations done by both functions should be considered as one action and as
such they are called by the exynos-pcie driver (without doing anything
between them). The initialization is just a sequence of register writes,
which cannot be altered without breaking the hardware operation.

To match the generic PHY framework requirement, simply move all register
writes to the phy_init()/phy_exit() and drop power_on()/power_off()
callbacks. This way the driver will also work with the old (incorrect)
PHY initialization call sequence.

Link: https://lore.kernel.org/r/20220628220409.26545-1-m.szyprowski@samsung.com
Reported-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-By: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/phy/samsung/phy-exynos-pcie.c | 25 +++++++++----------------
1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos-pcie.c b/drivers/phy/samsung/phy-exynos-pcie.c
index 578cfe07d07a..53c9230c2907 100644
--- a/drivers/phy/samsung/phy-exynos-pcie.c
+++ b/drivers/phy/samsung/phy-exynos-pcie.c
@@ -51,6 +51,13 @@ static int exynos5433_pcie_phy_init(struct phy *phy)
{
struct exynos_pcie_phy *ep = phy_get_drvdata(phy);

+ regmap_update_bits(ep->pmureg, EXYNOS5433_PMU_PCIE_PHY_OFFSET,
+ BIT(0), 1);
+ regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_GLOBAL_RESET,
+ PCIE_APP_REQ_EXIT_L1_MODE, 0);
+ regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_L1SUB_CM_CON,
+ PCIE_REFCLK_GATING_EN, 0);
+
regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_COMMON_RESET,
PCIE_PHY_RESET, 1);
regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_MAC_RESET,
@@ -109,20 +116,7 @@ static int exynos5433_pcie_phy_init(struct phy *phy)
return 0;
}

-static int exynos5433_pcie_phy_power_on(struct phy *phy)
-{
- struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
-
- regmap_update_bits(ep->pmureg, EXYNOS5433_PMU_PCIE_PHY_OFFSET,
- BIT(0), 1);
- regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_GLOBAL_RESET,
- PCIE_APP_REQ_EXIT_L1_MODE, 0);
- regmap_update_bits(ep->fsysreg, PCIE_EXYNOS5433_PHY_L1SUB_CM_CON,
- PCIE_REFCLK_GATING_EN, 0);
- return 0;
-}
-
-static int exynos5433_pcie_phy_power_off(struct phy *phy)
+static int exynos5433_pcie_phy_exit(struct phy *phy)
{
struct exynos_pcie_phy *ep = phy_get_drvdata(phy);

@@ -135,8 +129,7 @@ static int exynos5433_pcie_phy_power_off(struct phy *phy)

static const struct phy_ops exynos5433_phy_ops = {
.init = exynos5433_pcie_phy_init,
- .power_on = exynos5433_pcie_phy_power_on,
- .power_off = exynos5433_pcie_phy_power_off,
+ .exit = exynos5433_pcie_phy_exit,
.owner = THIS_MODULE,
};

--
2.35.1