[PATCH v4 0/2] pmdomain: imx: Fix i.MX8MP VC8000E power up sequence

[PATCH v4 0/2] pmdomain: imx: Fix i.MX8MP VC8000E power up sequence

[Peng Fan (OSS)]

There is an errata for i.MX8MP VC8000E:
    ERR050531: VPU_NOC power down handshake may hang during VC8000E/VPUMIX
    power up/down cycling.
    Description: VC8000E reset de-assertion edge and AXI clock may have a
    timing issue.
    Workaround: Set bit2 (vc8000e_clk_en) of BLK_CLK_EN_CSR to 0 to gate off
    both AXI clock and VC8000E clock sent to VC8000E and AXI clock sent to
    VPU_NOC m_v_2 interface during VC8000E power up(VC8000E reset is
    de-asserted by HW)

This patchset is to fix the errata. More info could be found in each
patch commit.

Sorry for sending v4 at 7.1-rc7, no rush for 7.1.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
Changes in v4:
- Add R-b
- Set is_errata_err050531 to true for vc8000e
- Link to v3: https://lore.kernel.org/r/20260409-imx8mp-vc8000e-pm-v3-0-3e023eaa245b@nxp.com

Changes in v3:
- Separate power up notifier fix into patch 1
- Link to v2: https://lore.kernel.org/r/20260228-imx8mp-vc8000e-pm-v2-1-fd255a0d5958@nxp.com

Changes in v2:
- Add errata link in commit message
- Add comment for is_errata_err050531
- Link to v1: https://lore.kernel.org/r/20260128-imx8mp-vc8000e-pm-v1-1-6c171451c732@nxp.com

---
Peng Fan (2):
      pmdomain: imx: Fix i.MX8MP power notifier
      pmdomain: imx: Fix i.MX8MP VC8000E power up sequence

 drivers/pmdomain/imx/imx8m-blk-ctrl.c | 46 +++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)
---
base-commit: 49e02880ec0a8c378e811bc9d85da188d7c6204c
change-id: 20260610-b4-imx8mp-vc8000e-pm-v4-1-a978b40c59d0

Best regards,
--  
Peng Fan <peng.fan@nxp.com>

[PATCH v4 1/2] pmdomain: imx: Fix i.MX8MP power notifier

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

Using imx8mm_vpu_power_notifier() for i.MX8MP is wrong, as it ungates
the VPU clocks to provide the ADB clock, which is necessary on i.MX8MM,
but on i.MX8MP there is a separate gate (bit 3) for the NoC. So add
imx8mp_vpu_power_notifier() for i.MX8MP.

Fixes: a1a5f15f7f6cb ("soc: imx: imx8m-blk-ctrl: add i.MX8MP VPU blk ctrl")
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/pmdomain/imx/imx8m-blk-ctrl.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c
index 19e992d2ee3b..e13a47eeed75 100644
--- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c
+++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c
@@ -514,9 +514,34 @@ static const struct imx8m_blk_ctrl_domain_data imx8mp_vpu_blk_ctl_domain_data[]
 	},
 };
 
+static int imx8mp_vpu_power_notifier(struct notifier_block *nb,
+				     unsigned long action, void *data)
+{
+	struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
+						 power_nb);
+
+	if (action == GENPD_NOTIFY_ON) {
+		/*
+		 * On power up we have no software backchannel to the GPC to
+		 * wait for the ADB handshake to happen, so we just delay for a
+		 * bit. On power down the GPC driver waits for the handshake.
+		 */
+
+		udelay(5);
+
+		/* set "fuse" bits to enable the VPUs */
+		regmap_set_bits(bc->regmap, 0x8, 0xffffffff);
+		regmap_set_bits(bc->regmap, 0xc, 0xffffffff);
+		regmap_set_bits(bc->regmap, 0x10, 0xffffffff);
+		regmap_set_bits(bc->regmap, 0x14, 0xffffffff);
+	}
+
+	return NOTIFY_OK;
+}
+
 static const struct imx8m_blk_ctrl_data imx8mp_vpu_blk_ctl_dev_data = {
 	.max_reg = 0x18,
-	.power_notifier_fn = imx8mm_vpu_power_notifier,
+	.power_notifier_fn = imx8mp_vpu_power_notifier,
 	.domains = imx8mp_vpu_blk_ctl_domain_data,
 	.num_domains = ARRAY_SIZE(imx8mp_vpu_blk_ctl_domain_data),
 };

-- 
2.51.0

[PATCH v4 2/2] pmdomain: imx: Fix i.MX8MP VC8000E power up sequence

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

Per errata[1]:
ERR050531: VPU_NOC power down handshake may hang during VC8000E/VPUMIX
power up/down cycling.
Description: VC8000E reset de-assertion edge and AXI clock may have a
timing issue.
Workaround: Set bit2 (vc8000e_clk_en) of BLK_CLK_EN_CSR to 0 to gate off
both AXI clock and VC8000E clock sent to VC8000E and AXI clock sent to
VPU_NOC m_v_2 interface during VC8000E power up(VC8000E reset is
de-asserted by HW)

Add a bool variable is_errata_err050531 in
'struct imx8m_blk_ctrl_domain_data' to represent whether the workaround
is needed. If is_errata_err050531 is true, first clear the clk before
powering up gpc, then enable the clk after powering up gpc.

[1] https://www.nxp.com/webapp/Download?colCode=IMX8MP_1P33A

Fixes: a1a5f15f7f6cb ("soc: imx: imx8m-blk-ctrl: add i.MX8MP VPU blk ctrl")
Cc: stable@vger.kernel.org
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/pmdomain/imx/imx8m-blk-ctrl.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c
index e13a47eeed75..99d100e1d923 100644
--- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c
+++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c
@@ -54,6 +54,15 @@ struct imx8m_blk_ctrl_domain_data {
 	 * register.
 	 */
 	u32 mipi_phy_rst_mask;
+
+	/*
+	 * VC8000E reset de-assertion edge and AXI clock may have a timing issue.
+	 * Workaround: Set bit2 (vc8000e_clk_en) of BLK_CLK_EN_CSR to 0 to gate off
+	 * both AXI clock and VC8000E clock sent to VC8000E and AXI clock sent to
+	 * VPU_NOC m_v_2 interface during VC8000E power up(VC8000E reset is
+	 * de-asserted by HW)
+	 */
+	bool is_errata_err050531;
 };
 
 #define DOMAIN_MAX_CLKS 4
@@ -108,7 +117,11 @@ static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
 		dev_err(bc->dev, "failed to enable clocks\n");
 		goto bus_put;
 	}
-	regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
+
+	if (data->is_errata_err050531)
+		regmap_clear_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
+	else
+		regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
 
 	/* power up upstream GPC domain */
 	ret = pm_runtime_get_sync(domain->power_dev);
@@ -117,6 +130,9 @@ static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
 		goto clk_disable;
 	}
 
+	if (data->is_errata_err050531)
+		regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
+
 	/* wait for reset to propagate */
 	udelay(5);
 
@@ -511,6 +527,7 @@ static const struct imx8m_blk_ctrl_domain_data imx8mp_vpu_blk_ctl_domain_data[]
 		.clk_mask = BIT(2),
 		.path_names = (const char *[]){"vc8000e"},
 		.num_paths = 1,
+		.is_errata_err050531 = true,
 	},
 };
 

-- 
2.51.0

Re: [PATCH v4 2/2] pmdomain: imx: Fix i.MX8MP VC8000E power up sequence

[Frank Li]

On Wed, Jun 10, 2026 at 10:39:11PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> Per errata[1]:
> ERR050531: VPU_NOC power down handshake may hang during VC8000E/VPUMIX
> power up/down cycling.
> Description: VC8000E reset de-assertion edge and AXI clock may have a
> timing issue.
> Workaround: Set bit2 (vc8000e_clk_en) of BLK_CLK_EN_CSR to 0 to gate off
> both AXI clock and VC8000E clock sent to VC8000E and AXI clock sent to
> VPU_NOC m_v_2 interface during VC8000E power up(VC8000E reset is
> de-asserted by HW)
>
> Add a bool variable is_errata_err050531 in
> 'struct imx8m_blk_ctrl_domain_data' to represent whether the workaround
> is needed. If is_errata_err050531 is true, first clear the clk before
> powering up gpc, then enable the clk after powering up gpc.
>
> [1] https://www.nxp.com/webapp/Download?colCode=IMX8MP_1P33A
>
> Fixes: a1a5f15f7f6cb ("soc: imx: imx8m-blk-ctrl: add i.MX8MP VPU blk ctrl")
> Cc: stable@vger.kernel.org
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/pmdomain/imx/imx8m-blk-ctrl.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c
> index e13a47eeed75..99d100e1d923 100644
> --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c
> +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c
> @@ -54,6 +54,15 @@ struct imx8m_blk_ctrl_domain_data {
>  	 * register.
>  	 */
>  	u32 mipi_phy_rst_mask;
> +
> +	/*
> +	 * VC8000E reset de-assertion edge and AXI clock may have a timing issue.
> +	 * Workaround: Set bit2 (vc8000e_clk_en) of BLK_CLK_EN_CSR to 0 to gate off
> +	 * both AXI clock and VC8000E clock sent to VC8000E and AXI clock sent to
> +	 * VPU_NOC m_v_2 interface during VC8000E power up(VC8000E reset is
> +	 * de-asserted by HW)
> +	 */
> +	bool is_errata_err050531;
>  };
>
>  #define DOMAIN_MAX_CLKS 4
> @@ -108,7 +117,11 @@ static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
>  		dev_err(bc->dev, "failed to enable clocks\n");
>  		goto bus_put;
>  	}
> -	regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
> +
> +	if (data->is_errata_err050531)
> +		regmap_clear_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
> +	else
> +		regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
>
>  	/* power up upstream GPC domain */
>  	ret = pm_runtime_get_sync(domain->power_dev);
> @@ -117,6 +130,9 @@ static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
>  		goto clk_disable;
>  	}
>
> +	if (data->is_errata_err050531)
> +		regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
> +
>  	/* wait for reset to propagate */
>  	udelay(5);
>
> @@ -511,6 +527,7 @@ static const struct imx8m_blk_ctrl_domain_data imx8mp_vpu_blk_ctl_domain_data[]
>  		.clk_mask = BIT(2),
>  		.path_names = (const char *[]){"vc8000e"},
>  		.num_paths = 1,
> +		.is_errata_err050531 = true,
>  	},
>  };
>
>
> --
> 2.51.0
>
>

Re: [PATCH v4 0/2] pmdomain: imx: Fix i.MX8MP VC8000E power up sequence

[Peng Fan]

Hi Ulf,

ping..

Thanks,
Peng
On Wed, Jun 10, 2026 at 10:39:09PM +0800, Peng Fan (OSS) wrote:
>There is an errata for i.MX8MP VC8000E:
>    ERR050531: VPU_NOC power down handshake may hang during VC8000E/VPUMIX
>    power up/down cycling.
>    Description: VC8000E reset de-assertion edge and AXI clock may have a
>    timing issue.
>    Workaround: Set bit2 (vc8000e_clk_en) of BLK_CLK_EN_CSR to 0 to gate off
>    both AXI clock and VC8000E clock sent to VC8000E and AXI clock sent to
>    VPU_NOC m_v_2 interface during VC8000E power up(VC8000E reset is
>    de-asserted by HW)
>
>This patchset is to fix the errata. More info could be found in each
>patch commit.
>
>Sorry for sending v4 at 7.1-rc7, no rush for 7.1.
>
>Signed-off-by: Peng Fan <peng.fan@nxp.com>
>---
>Changes in v4:
>- Add R-b
>- Set is_errata_err050531 to true for vc8000e
>- Link to v3: https://lore.kernel.org/r/20260409-imx8mp-vc8000e-pm-v3-0-3e023eaa245b@nxp.com
>
>Changes in v3:
>- Separate power up notifier fix into patch 1
>- Link to v2: https://lore.kernel.org/r/20260228-imx8mp-vc8000e-pm-v2-1-fd255a0d5958@nxp.com
>
>Changes in v2:
>- Add errata link in commit message
>- Add comment for is_errata_err050531
>- Link to v1: https://lore.kernel.org/r/20260128-imx8mp-vc8000e-pm-v1-1-6c171451c732@nxp.com
>
>---
>Peng Fan (2):
>      pmdomain: imx: Fix i.MX8MP power notifier
>      pmdomain: imx: Fix i.MX8MP VC8000E power up sequence
>
> drivers/pmdomain/imx/imx8m-blk-ctrl.c | 46 +++++++++++++++++++++++++++++++++--
> 1 file changed, 44 insertions(+), 2 deletions(-)
>---
>base-commit: 49e02880ec0a8c378e811bc9d85da188d7c6204c
>change-id: 20260610-b4-imx8mp-vc8000e-pm-v4-1-a978b40c59d0
>
>Best regards,
>--  
>Peng Fan <peng.fan@nxp.com>
>