[PATCH 0/3] APBH DMA fixes for i.MX7

[PATCH 0/3] APBH DMA fixes for i.MX7

[Andrey Smirnov]

Hi everyone:

The following two patches are to fix a case of broken boot I
discovered when I built a mult-image build for i.MX6 and i.MX7 and
tried to boot it on my i.MX7 SabreSD board.

Let me know if anything needs changing.

Thanks,
Andrey Smirnov

Andrey Smirnov (3):
  clk: i.MX7: Port NAND clock setup code from Linux
  clk: Forward declare struct of_device_id in linux/clk.h
  dma: apbh: Enable clock as a part of probing

 drivers/clk/imx/clk-imx7.c |  5 +++--
 drivers/clk/imx/clk.h      |  7 +++++++
 drivers/dma/apbh_dma.c     | 13 +++++++++++++
 include/linux/clk.h        |  1 +
 4 files changed, 24 insertions(+), 2 deletions(-)

-- 
2.14.3


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[PATCH 1/3] clk: i.MX7: Port NAND clock setup code from Linux

[Andrey Smirnov]

Port Linux kernel commit 22039d150f716e4e ("clk: imx7d: create clocks
behind rawnand clock gate") in order to correctly initialize clocks
necessary for APBH DMA block to be functional on i.MX7

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/clk/imx/clk-imx7.c | 5 +++--
 drivers/clk/imx/clk.h      | 7 +++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/imx/clk-imx7.c b/drivers/clk/imx/clk-imx7.c
index b79c8c301..548f86cbe 100644
--- a/drivers/clk/imx/clk-imx7.c
+++ b/drivers/clk/imx/clk-imx7.c
@@ -676,7 +676,7 @@ static int imx7_ccm_probe(struct device_d *dev)
 	clks[IMX7D_ENET2_TIME_ROOT_DIV] = imx_clk_divider2("enet2_time_post_div", "enet2_time_pre_div", base + 0xa880, 0, 6);
 	clks[IMX7D_ENET_PHY_REF_ROOT_DIV] = imx_clk_divider2("enet_phy_ref_post_div", "enet_phy_ref_pre_div", base + 0xa900, 0, 6);
 	clks[IMX7D_EIM_ROOT_DIV] = imx_clk_divider2("eim_post_div", "eim_pre_div", base + 0xa980, 0, 6);
-	clks[IMX7D_NAND_ROOT_DIV] = imx_clk_divider2("nand_post_div", "nand_pre_div", base + 0xaa00, 0, 6);
+	clks[IMX7D_NAND_ROOT_CLK] = imx_clk_divider2("nand_root_clk", "nand_pre_div", base + 0xaa00, 0, 6);
 	clks[IMX7D_QSPI_ROOT_DIV] = imx_clk_divider2("qspi_post_div", "qspi_pre_div", base + 0xaa80, 0, 6);
 	clks[IMX7D_USDHC1_ROOT_DIV] = imx_clk_divider2("usdhc1_post_div", "usdhc1_pre_div", base + 0xab00, 0, 6);
 	clks[IMX7D_USDHC2_ROOT_DIV] = imx_clk_divider2("usdhc2_post_div", "usdhc2_pre_div", base + 0xab80, 0, 6);
@@ -751,7 +751,8 @@ static int imx7_ccm_probe(struct device_d *dev)
 	clks[IMX7D_ENET_PHY_REF_ROOT_CLK] = imx_clk_gate4("enet_phy_ref_root_clk", "enet_phy_ref_post_div", base + 0x4520, 0);
 
 	clks[IMX7D_EIM_ROOT_CLK] = imx_clk_gate4("eim_root_clk", "eim_post_div", base + 0x4160, 0);
-	clks[IMX7D_NAND_ROOT_CLK] = imx_clk_gate4("nand_root_clk", "nand_post_div", base + 0x4140, 0);
+	clks[IMX7D_NAND_RAWNAND_CLK] = imx_clk_gate2_shared2("nand_rawnand_clk", "nand_root_clk", base + 0x4140, 0);
+	clks[IMX7D_NAND_USDHC_BUS_RAWNAND_CLK] = imx_clk_gate2_shared2("nand_usdhc_rawnand_clk", "nand_usdhc_root_clk", base + 0x4140, 0);	
 	clks[IMX7D_QSPI_ROOT_CLK] = imx_clk_gate4("qspi_root_clk", "qspi_post_div", base + 0x4150, 0);
 	clks[IMX7D_USB_CTRL_CLK] = imx_clk_gate4("usb_ctrl_clk", "osc", base + 0x4680, 0);
 	clks[IMX7D_USB_PHY1_CLK] = imx_clk_gate4("usbphy1_clk", "osc", base + 0x46a0, 0);
diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index c46c2614d..71c6f459a 100644
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -80,6 +80,13 @@ static inline struct clk *imx_clk_gate2(const char *name, const char *parent,
 	return clk_gate2(name, parent, reg, shift, 0x3, 0);
 }
 
+static inline struct clk *imx_clk_gate2_shared2(const char *name, const char *parent,
+						void __iomem *reg, u8 shift)
+{
+	return clk_gate2(name, parent, reg, shift, 0x3,
+			 CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE);
+}
+
 static inline struct clk *imx_clk_gate2_cgr(const char *name, const char *parent,
 					    void __iomem *reg, u8 shift, u8 cgr_val)
 {
-- 
2.14.3


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[PATCH 2/3] clk: Forward declare struct of_device_id in linux/clk.h

[Andrey Smirnov]

Forward declare struct of_device_id in linux/clk.h in order to avoid
warnings like the following:

warning: 'struct of_device_id' declared inside parameter list will not be visible outside
of this definition or declaration
 int of_clk_init(struct device_node *root, const struct of_device_id *matches);
                                                        ^~~~~~~~~~~~

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 include/linux/clk.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/clk.h b/include/linux/clk.h
index 081a85972..c6465b1c9 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -323,6 +323,7 @@ struct clk *clk_register_composite(const char *name,
 
 struct device_node;
 struct of_phandle_args;
+struct of_device_id;
 
 #if defined(CONFIG_COMMON_CLK_OF_PROVIDER)
 
-- 
2.14.3


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[PATCH 3/3] dma: apbh: Enable clock as a part of probing

[Andrey Smirnov]

Enable clock as a part of probing in order to avoid problems on SoCs
that do not have this block ungated out of reset (e.g. i.MX7).

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/dma/apbh_dma.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index b84c0f798..79f25109f 100644
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -17,6 +17,7 @@
 
 #include <dma/apbh-dma.h>
 #include <stmp-device.h>
+#include <linux/clk.h>
 #include <linux/list.h>
 #include <linux/err.h>
 #include <common.h>
@@ -55,6 +56,7 @@ enum mxs_dma_id {
 
 struct apbh_dma {
 	void __iomem *regs;
+	struct clk *clk;
 	enum mxs_dma_id id;
 };
 
@@ -606,6 +608,17 @@ static int apbh_dma_probe(struct device_d *dev)
 
 	apbh->id = id;
 
+	apbh->clk = clk_get(dev, NULL);
+	if (IS_ERR(apbh->clk))
+		return PTR_ERR(apbh->clk);
+
+	ret = clk_enable(apbh->clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock: %s\n",
+			strerror(ret));
+		return ret;
+	}
+
 	ret = stmp_reset_block(apbh->regs, 0);
 	if (ret)
 		return ret;
-- 
2.14.3


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[PATCH] Revert "startup: Load default environment earlier"

[Andrey Smirnov]

From: Sascha Hauer <s.hauer@pengutronix.de>

Several boards use defaultenv_append_directory() to append a board
specific envfs snippet during runtime. This only works when
defaultenv_append_directory() is called before defaultenv_load() is
exectuted. Since that was executed at the end of the start process
every initcall level could be used to append a env directory. With this
patch only initcall levels earlier than fsdevice_initcall work and
most boards do not cope with this.

Revert this patch until a better solution is found.

Reported-by: Alexander Kurz <akurz@blala.de>

This reverts commit 5b92cfceff38f3a6462a21cf6b69159ad0ae9744.
---
 common/startup.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/common/startup.c b/common/startup.c
index 8940674528..8553849cb3 100644
--- a/common/startup.c
+++ b/common/startup.c
@@ -67,9 +67,6 @@ static int mount_root(void)
 		mount("none", "pstore", "/pstore", NULL);
 	}
 
-	if (IS_ENABLED(CONFIG_DEFAULT_ENVIRONMENT))
-		defaultenv_load("/env", 0);
-
 	return 0;
 }
 fs_initcall(mount_root);
@@ -82,6 +79,9 @@ static int load_environment(void)
 
 	default_environment_path = default_environment_path_get();
 
+	if (IS_ENABLED(CONFIG_DEFAULT_ENVIRONMENT))
+		defaultenv_load("/env", 0);
+
 	envfs_load(default_environment_path, "/env", 0);
 	nvvar_load();
 
-- 
2.16.1

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Re: [PATCH 0/3] APBH DMA fixes for i.MX7

[Sascha Hauer]

On Sat, Mar 31, 2018 at 06:13:54PM -0700, Andrey Smirnov wrote:
> Hi everyone:
> 
> The following two patches are to fix a case of broken boot I
> discovered when I built a mult-image build for i.MX6 and i.MX7 and
> tried to boot it on my i.MX7 SabreSD board.
> 
> Let me know if anything needs changing.

Looks fine, thanks. Applied.

Sascha

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