From: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
To: robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de
Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
p.zabel@pengutronix.de, l.stach@pengutronix.de, krzk@kernel.org,
agx@sigxcpu.org, marex@denx.de, andrew.smirnov@gmail.com,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, ping.bai@nxp.com,
frieder.schrempf@kontron.de, aford173@gmail.com,
abel.vesa@nxp.com
Subject: [PATCH 05/16] soc: imx: gpcv2: wait for ADB400 handshake
Date: Thu, 29 Apr 2021 15:30:39 +0800 [thread overview]
Message-ID: <20210429073050.21039-6-peng.fan@oss.nxp.com> (raw)
In-Reply-To: <20210429073050.21039-1-peng.fan@oss.nxp.com>
From: Lucas Stach <l.stach@pengutronix.de>
New reference manuals show that there is actually a status bit for
the ADB400 handshake. Add a poll loop to wait for the ADB400 to
acknowledge our request.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
drivers/soc/imx/gpcv2.c | 43 +++++++++++++++++++++++++++++++++--------
1 file changed, 35 insertions(+), 8 deletions(-)
diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index 7356e48ebdad..d27025e37a9e 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c
@@ -69,6 +69,9 @@
#define GPC_PU_PWRHSK 0x1fc
+#define IMX8M_GPU_HSK_PWRDNACKN BIT(26)
+#define IMX8M_VPU_HSK_PWRDNACKN BIT(25)
+#define IMX8M_DISP_HSK_PWRDNACKN BIT(24)
#define IMX8M_GPU_HSK_PWRDNREQN BIT(6)
#define IMX8M_VPU_HSK_PWRDNREQN BIT(5)
#define IMX8M_DISP_HSK_PWRDNREQN BIT(4)
@@ -112,7 +115,8 @@ struct imx_pgc_domain {
const struct {
u32 pxx;
u32 map;
- u32 hsk;
+ u32 hskreq;
+ u32 hskack;
} bits;
const int voltage;
@@ -172,9 +176,19 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
GPC_PGC_CTRL_PCR, 0);
/* request the ADB400 to power up */
- if (domain->bits.hsk)
+ if (domain->bits.hskreq) {
regmap_update_bits(domain->regmap, GPC_PU_PWRHSK,
- domain->bits.hsk, domain->bits.hsk);
+ domain->bits.hskreq, domain->bits.hskreq);
+
+ ret = regmap_read_poll_timeout(domain->regmap, GPC_PU_PWRHSK,
+ reg_val,
+ (reg_val & domain->bits.hskack),
+ 0, USEC_PER_MSEC);
+ if (ret) {
+ dev_err(domain->dev, "failed to power up ADB400\n");
+ goto out_clk_disable;
+ }
+ }
/* Disable reset clocks for all devices in the domain */
clk_bulk_disable_unprepare(domain->num_clks, domain->clks);
@@ -204,9 +218,19 @@ static int imx_pgc_power_down(struct generic_pm_domain *genpd)
}
/* request the ADB400 to power down */
- if (domain->bits.hsk)
+ if (domain->bits.hskreq) {
regmap_update_bits(domain->regmap, GPC_PU_PWRHSK,
- domain->bits.hsk, 0);
+ domain->bits.hskreq, 0);
+
+ ret = regmap_read_poll_timeout(domain->regmap, GPC_PU_PWRHSK,
+ reg_val,
+ !(reg_val & domain->bits.hskack),
+ 0, USEC_PER_MSEC);
+ if (ret) {
+ dev_err(domain->dev, "failed to power down ADB400\n");
+ goto out_clk_disable;
+ }
+ }
/* enable power control */
regmap_update_bits(domain->regmap, GPC_PGC_CTRL(domain->pgc),
@@ -369,7 +393,8 @@ static const struct imx_pgc_domain imx8m_pgc_domains[] = {
.bits = {
.pxx = IMX8M_GPU_SW_Pxx_REQ,
.map = IMX8M_GPU_A53_DOMAIN,
- .hsk = IMX8M_GPU_HSK_PWRDNREQN,
+ .hskreq = IMX8M_GPU_HSK_PWRDNREQN,
+ .hskack = IMX8M_GPU_HSK_PWRDNACKN,
},
.pgc = IMX8M_PGC_GPU,
},
@@ -381,7 +406,8 @@ static const struct imx_pgc_domain imx8m_pgc_domains[] = {
.bits = {
.pxx = IMX8M_VPU_SW_Pxx_REQ,
.map = IMX8M_VPU_A53_DOMAIN,
- .hsk = IMX8M_VPU_HSK_PWRDNREQN,
+ .hskreq = IMX8M_VPU_HSK_PWRDNREQN,
+ .hskack = IMX8M_VPU_HSK_PWRDNACKN,
},
.pgc = IMX8M_PGC_VPU,
},
@@ -393,7 +419,8 @@ static const struct imx_pgc_domain imx8m_pgc_domains[] = {
.bits = {
.pxx = IMX8M_DISP_SW_Pxx_REQ,
.map = IMX8M_DISP_A53_DOMAIN,
- .hsk = IMX8M_DISP_HSK_PWRDNREQN,
+ .hskreq = IMX8M_DISP_HSK_PWRDNREQN,
+ .hskack = IMX8M_DISP_HSK_PWRDNACKN,
},
.pgc = IMX8M_PGC_DISP,
},
--
2.30.0
next prev parent reply other threads:[~2021-04-29 6:59 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-29 7:30 [PATCH 00/16] soc: imx: gpcv2: support i.MX8MM Peng Fan (OSS)
2021-04-29 7:30 ` [PATCH 01/16] soc: imx: gpcv2: move to more ideomatic error handling in probe Peng Fan (OSS)
2021-05-03 13:26 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 02/16] soc: imx: gpcv2: move domain mapping to domain driver probe Peng Fan (OSS)
2021-05-03 13:27 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 03/16] soc: imx: gpcv2: switch to clk_bulk_* API Peng Fan (OSS)
2021-05-03 13:37 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 04/16] soc: imx: gpcv2: split power up and power down sequence control Peng Fan (OSS)
2021-05-03 14:13 ` Frieder Schrempf
2021-04-29 7:30 ` Peng Fan (OSS) [this message]
2021-04-29 7:30 ` [PATCH 06/16] soc: imx: gpcv2: add runtime PM support for power-domains Peng Fan (OSS)
2021-05-03 14:18 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 07/16] soc: imx: gpcv2: allow domains without power-sequence control Peng Fan (OSS)
2021-05-03 14:21 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 08/16] dt-bindings: imx: gpcv2: add support for optional resets Peng Fan (OSS)
2021-05-03 14:27 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 09/16] soc: " Peng Fan (OSS)
2021-05-03 14:30 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 10/16] dt-bindings: power: add defines for i.MX8MM power domains Peng Fan (OSS)
2021-05-03 19:37 ` Rob Herring
2021-04-29 7:30 ` [PATCH 11/16] soc: imx: gpcv2: add support " Peng Fan (OSS)
2021-05-03 14:37 ` Frieder Schrempf
2021-04-29 7:30 ` [PATCH 12/16] soc: imx: gpcv2: Add support for missing i.MX8MM VPU/DISPMIX " Peng Fan (OSS)
2021-04-29 7:30 ` [PATCH 13/16] soc: imx: gpcv2: correct pm_runtime_get_sync usage Peng Fan (OSS)
2021-04-29 14:25 ` Lucas Stach
2021-04-30 4:43 ` Peng Fan (OSS)
2021-04-29 7:30 ` [PATCH 14/16] soc: imx: gpcv2: move reset assert after requesting domain power up Peng Fan (OSS)
2021-04-29 14:28 ` Lucas Stach
2021-04-30 4:51 ` Peng Fan (OSS)
2021-04-29 7:30 ` [PATCH 15/16] soc: imx: gpcv2: support reset defer probe Peng Fan (OSS)
2021-04-29 8:39 ` Ahmad Fatoum
2021-04-29 14:30 ` Lucas Stach
2021-04-30 4:51 ` Peng Fan (OSS)
2021-04-29 7:30 ` [PATCH 16/16] soc: imx: gpcv2: remove waiting handshake in power up Peng Fan (OSS)
2021-04-29 14:34 ` Lucas Stach
2021-04-30 4:52 ` Peng Fan (OSS)
2021-04-30 7:14 ` Peng Fan (OSS)
2021-04-30 8:47 ` Lucas Stach
2021-04-29 12:39 ` [PATCH 00/16] soc: imx: gpcv2: support i.MX8MM Adam Ford
2021-04-30 1:33 ` Peng Fan
2021-04-30 3:05 ` Adam Ford
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