[PATCH v2 1/9] mmc: meson-gx: simplify bounce buffer setting in meson_mmc_start_cmd

[PATCH v2 1/9] mmc: meson-gx: simplify bounce buffer setting in meson_mmc_start_cmd

[Heiner Kallweit]

Core ensures that there are no commands with cmd->data being set and
nothing to transfer. And we don't have to reset bit CMD_CFG_DATA_NUM
because cmd_cfg was zero-initialized and this bit isn't set.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- adjusted commit message because branch xfer_bytes == 0 is never reached
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 5a959783..07a7399c 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -516,14 +516,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
 			desc->cmd_cfg &= ~CMD_CFG_DATA_WR;
 		}
 
-		if (xfer_bytes > 0) {
-			desc->cmd_cfg &= ~CMD_CFG_DATA_NUM;
-			desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
-		} else {
-			/* write data to data_addr */
-			desc->cmd_cfg |= CMD_CFG_DATA_NUM;
-			desc->cmd_data = 0;
-		}
+		desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
 
 		cmd_cfg_timeout = 12;
 	} else {
-- 
2.11.1

[PATCH v2 1/9] mmc: meson-gx: simplify bounce buffer setting in meson_mmc_start_cmd

[Heiner Kallweit]

Core ensures that there are no commands with cmd->data being set and
nothing to transfer. And we don't have to reset bit CMD_CFG_DATA_NUM
because cmd_cfg was zero-initialized and this bit isn't set.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- adjusted commit message because branch xfer_bytes == 0 is never reached
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 5a959783..07a7399c 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -516,14 +516,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
 			desc->cmd_cfg &= ~CMD_CFG_DATA_WR;
 		}
 
-		if (xfer_bytes > 0) {
-			desc->cmd_cfg &= ~CMD_CFG_DATA_NUM;
-			desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
-		} else {
-			/* write data to data_addr */
-			desc->cmd_cfg |= CMD_CFG_DATA_NUM;
-			desc->cmd_data = 0;
-		}
+		desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
 
 		cmd_cfg_timeout = 12;
 	} else {
-- 
2.11.1

[PATCH v2 2/9] mmc: meson-gx: make two functions return void

The return value of meson_mmc_request_done and meson_mmc_read_resp
isn't used, so make both functions return void.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 07a7399c..b99461ff 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -426,7 +426,8 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 			__func__, orig, val);
 }
 
-static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
+static void meson_mmc_request_done(struct mmc_host *mmc,
+				   struct mmc_request *mrq)
 {
 	struct meson_host *host = mmc_priv(mmc);
 
@@ -435,8 +436,6 @@ static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
 	host->mrq = NULL;
 	host->cmd = NULL;
 	mmc_request_done(host->mmc, mrq);
-
-	return 0;
 }
 
 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
@@ -554,7 +553,7 @@ static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		meson_mmc_start_cmd(mmc, mrq->cmd);
 }
 
-static int meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
+static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
 {
 	struct meson_host *host = mmc_priv(mmc);
 
@@ -566,8 +565,6 @@ static int meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
 	} else if (cmd->flags & MMC_RSP_PRESENT) {
 		cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
 	}
-
-	return 0;
 }
 
 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
-- 
2.11.1

[PATCH v2 2/9] mmc: meson-gx: make two functions return void

[Heiner Kallweit]

The return value of meson_mmc_request_done and meson_mmc_read_resp
isn't used, so make both functions return void.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 07a7399c..b99461ff 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -426,7 +426,8 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 			__func__, orig, val);
 }
 
-static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
+static void meson_mmc_request_done(struct mmc_host *mmc,
+				   struct mmc_request *mrq)
 {
 	struct meson_host *host = mmc_priv(mmc);
 
@@ -435,8 +436,6 @@ static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
 	host->mrq = NULL;
 	host->cmd = NULL;
 	mmc_request_done(host->mmc, mrq);
-
-	return 0;
 }
 
 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
@@ -554,7 +553,7 @@ static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		meson_mmc_start_cmd(mmc, mrq->cmd);
 }
 
-static int meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
+static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
 {
 	struct meson_host *host = mmc_priv(mmc);
 
@@ -566,8 +565,6 @@ static int meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
 	} else if (cmd->flags & MMC_RSP_PRESENT) {
 		cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
 	}
-
-	return 0;
 }
 
 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
-- 
2.11.1

[PATCH v2 3/9] mmc: meson-gx: remove unused members irq, ocr_mask from struct meson_host

[Heiner Kallweit]

Member ocr_mask is never used and member irq we can replace with a
local variable in meson_mmc_probe. So let's remove both members.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index b99461ff..b9de3d47 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -127,8 +127,6 @@ struct meson_host {
 
 	spinlock_t lock;
 	void __iomem *regs;
-	int irq;
-	u32 ocr_mask;
 	struct clk *core_clk;
 	struct clk_mux mux;
 	struct clk *mux_clk;
@@ -712,7 +710,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct meson_host *host;
 	struct mmc_host *mmc;
-	int ret;
+	int ret, irq;
 
 	mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
 	if (!mmc)
@@ -744,8 +742,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 		goto free_host;
 	}
 
-	host->irq = platform_get_irq(pdev, 0);
-	if (host->irq == 0) {
+	irq = platform_get_irq(pdev, 0);
+	if (!irq) {
 		dev_err(&pdev->dev, "failed to get interrupt resource.\n");
 		ret = -EINVAL;
 		goto free_host;
@@ -773,9 +771,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
 
-	ret = devm_request_threaded_irq(&pdev->dev, host->irq,
-					meson_mmc_irq, meson_mmc_irq_thread,
-					IRQF_SHARED, DRIVER_NAME, host);
+	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
+					meson_mmc_irq_thread, IRQF_SHARED,
+					DRIVER_NAME, host);
 	if (ret)
 		goto free_host;
 
-- 
2.11.1

[PATCH v2 3/9] mmc: meson-gx: remove unused members irq, ocr_mask from struct meson_host

[Heiner Kallweit]

Member ocr_mask is never used and member irq we can replace with a
local variable in meson_mmc_probe. So let's remove both members.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index b99461ff..b9de3d47 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -127,8 +127,6 @@ struct meson_host {
 
 	spinlock_t lock;
 	void __iomem *regs;
-	int irq;
-	u32 ocr_mask;
 	struct clk *core_clk;
 	struct clk_mux mux;
 	struct clk *mux_clk;
@@ -712,7 +710,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct meson_host *host;
 	struct mmc_host *mmc;
-	int ret;
+	int ret, irq;
 
 	mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
 	if (!mmc)
@@ -744,8 +742,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 		goto free_host;
 	}
 
-	host->irq = platform_get_irq(pdev, 0);
-	if (host->irq == 0) {
+	irq = platform_get_irq(pdev, 0);
+	if (!irq) {
 		dev_err(&pdev->dev, "failed to get interrupt resource.\n");
 		ret = -EINVAL;
 		goto free_host;
@@ -773,9 +771,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
 
-	ret = devm_request_threaded_irq(&pdev->dev, host->irq,
-					meson_mmc_irq, meson_mmc_irq_thread,
-					IRQF_SHARED, DRIVER_NAME, host);
+	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
+					meson_mmc_irq_thread, IRQF_SHARED,
+					DRIVER_NAME, host);
 	if (ret)
 		goto free_host;
 
-- 
2.11.1

[PATCH v2 4/9] mmc: meson-gx: remove unneeded variable in meson_mmc_clk_init

[Heiner Kallweit]

Because the DT requires a fixed number of mux parent clocks,
variable mux_parent_count can be replaced with constant
MUX_CLK_NUM_PARENTS, so remove it.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- adjusted commit message
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index b9de3d47..ea2db3ce 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -242,7 +242,6 @@ static int meson_mmc_clk_init(struct meson_host *host)
 	char clk_name[32];
 	int i, ret = 0;
 	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
-	unsigned int mux_parent_count = 0;
 	const char *clk_div_parents[1];
 	u32 clk_reg, cfg;
 
@@ -261,7 +260,6 @@ static int meson_mmc_clk_init(struct meson_host *host)
 		}
 
 		mux_parent_names[i] = __clk_get_name(host->mux_parent[i]);
-		mux_parent_count++;
 	}
 
 	/* create the mux */
@@ -270,7 +268,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
 	init.ops = &clk_mux_ops;
 	init.flags = 0;
 	init.parent_names = mux_parent_names;
-	init.num_parents = mux_parent_count;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
 
 	host->mux.reg = host->regs + SD_EMMC_CLOCK;
 	host->mux.shift = CLK_SRC_SHIFT;
-- 
2.11.1

[PATCH v2 4/9] mmc: meson-gx: remove unneeded variable in meson_mmc_clk_init

[Heiner Kallweit]

Because the DT requires a fixed number of mux parent clocks,
variable mux_parent_count can be replaced with constant
MUX_CLK_NUM_PARENTS, so remove it.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- adjusted commit message
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index b9de3d47..ea2db3ce 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -242,7 +242,6 @@ static int meson_mmc_clk_init(struct meson_host *host)
 	char clk_name[32];
 	int i, ret = 0;
 	const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
-	unsigned int mux_parent_count = 0;
 	const char *clk_div_parents[1];
 	u32 clk_reg, cfg;
 
@@ -261,7 +260,6 @@ static int meson_mmc_clk_init(struct meson_host *host)
 		}
 
 		mux_parent_names[i] = __clk_get_name(host->mux_parent[i]);
-		mux_parent_count++;
 	}
 
 	/* create the mux */
@@ -270,7 +268,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
 	init.ops = &clk_mux_ops;
 	init.flags = 0;
 	init.parent_names = mux_parent_names;
-	init.num_parents = mux_parent_count;
+	init.num_parents = MUX_CLK_NUM_PARENTS;
 
 	host->mux.reg = host->regs + SD_EMMC_CLOCK;
 	host->mux.shift = CLK_SRC_SHIFT;
-- 
2.11.1

[PATCH v2 5/9] mmc: meson-gx: remove member parent_mux from struct meson_host

[Heiner Kallweit]

Member mux_parent isn't used outside meson_mmc_clk_init. So remove it
and replace it with a local variable in meson_mmc_clk_init.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index ea2db3ce..68e76fa8 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -130,7 +130,6 @@ struct meson_host {
 	struct clk *core_clk;
 	struct clk_mux mux;
 	struct clk *mux_clk;
-	struct clk *mux_parent[MUX_CLK_NUM_PARENTS];
 	unsigned long current_clock;
 
 	struct clk_divider cfg_div;
@@ -247,19 +246,18 @@ static int meson_mmc_clk_init(struct meson_host *host)
 
 	/* get the mux parents */
 	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		struct clk *clk;
 		char name[16];
 
 		snprintf(name, sizeof(name), "clkin%d", i);
-		host->mux_parent[i] = devm_clk_get(host->dev, name);
-		if (IS_ERR(host->mux_parent[i])) {
-			ret = PTR_ERR(host->mux_parent[i]);
-			if (PTR_ERR(host->mux_parent[i]) != -EPROBE_DEFER)
+		clk = devm_clk_get(host->dev, name);
+		if (IS_ERR(clk)) {
+			if (clk != ERR_PTR(-EPROBE_DEFER))
 				dev_err(host->dev, "Missing clock %s\n", name);
-			host->mux_parent[i] = NULL;
-			return ret;
+			return PTR_ERR(clk);
 		}
 
-		mux_parent_names[i] = __clk_get_name(host->mux_parent[i]);
+		mux_parent_names[i] = __clk_get_name(clk);
 	}
 
 	/* create the mux */
-- 
2.11.1

[PATCH v2 5/9] mmc: meson-gx: remove member parent_mux from struct meson_host

[Heiner Kallweit]

Member mux_parent isn't used outside meson_mmc_clk_init. So remove it
and replace it with a local variable in meson_mmc_clk_init.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index ea2db3ce..68e76fa8 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -130,7 +130,6 @@ struct meson_host {
 	struct clk *core_clk;
 	struct clk_mux mux;
 	struct clk *mux_clk;
-	struct clk *mux_parent[MUX_CLK_NUM_PARENTS];
 	unsigned long current_clock;
 
 	struct clk_divider cfg_div;
@@ -247,19 +246,18 @@ static int meson_mmc_clk_init(struct meson_host *host)
 
 	/* get the mux parents */
 	for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
+		struct clk *clk;
 		char name[16];
 
 		snprintf(name, sizeof(name), "clkin%d", i);
-		host->mux_parent[i] = devm_clk_get(host->dev, name);
-		if (IS_ERR(host->mux_parent[i])) {
-			ret = PTR_ERR(host->mux_parent[i]);
-			if (PTR_ERR(host->mux_parent[i]) != -EPROBE_DEFER)
+		clk = devm_clk_get(host->dev, name);
+		if (IS_ERR(clk)) {
+			if (clk != ERR_PTR(-EPROBE_DEFER))
 				dev_err(host->dev, "Missing clock %s\n", name);
-			host->mux_parent[i] = NULL;
-			return ret;
+			return PTR_ERR(clk);
 		}
 
-		mux_parent_names[i] = __clk_get_name(host->mux_parent[i]);
+		mux_parent_names[i] = __clk_get_name(clk);
 	}
 
 	/* create the mux */
-- 
2.11.1

[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Heiner Kallweit]

This clk_disable_unprepare isn't right here. At first the condition
should be "if (ret)" as the disable/unprepare is supposed to be
executed if the previous command fails.
And if the previous command fails and meson_mmc_clk_init returns
an error, then probe jumps to label free_host where we have this
disable/unprepare already.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- extended commit message
---
 drivers/mmc/host/meson-gx-mmc.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 68e76fa8..850b0152 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
 	/* Get the nearest minimum clock to 400KHz */
 	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
 
-	ret = meson_mmc_clk_set(host, host->mmc->f_min);
-	if (!ret)
-		clk_disable_unprepare(host->cfg_div_clk);
-
-	return ret;
+	return meson_mmc_clk_set(host, host->mmc->f_min);
 }
 
 static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-- 
2.11.1

[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Heiner Kallweit]

This clk_disable_unprepare isn't right here. At first the condition
should be "if (ret)" as the disable/unprepare is supposed to be
executed if the previous command fails.
And if the previous command fails and meson_mmc_clk_init returns
an error, then probe jumps to label free_host where we have this
disable/unprepare already.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- extended commit message
---
 drivers/mmc/host/meson-gx-mmc.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 68e76fa8..850b0152 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
 	/* Get the nearest minimum clock to 400KHz */
 	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
 
-	ret = meson_mmc_clk_set(host, host->mmc->f_min);
-	if (!ret)
-		clk_disable_unprepare(host->cfg_div_clk);
-
-	return ret;
+	return meson_mmc_clk_set(host, host->mmc->f_min);
 }
 
 static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-- 
2.11.1

[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Kevin Hilman]

Heiner Kallweit <hkallweit1@gmail.com> writes:

> This clk_disable_unprepare isn't right here. At first the condition
> should be "if (ret)" as the disable/unprepare is supposed to be
> executed if the previous command fails.
> And if the previous command fails and meson_mmc_clk_init returns
> an error, then probe jumps to label free_host where we have this
> disable/unprepare already.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Kevin Hilman <khilman@baylibre.com>

> ---
> v2:
> - extended commit message
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 68e76fa8..850b0152 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>  	/* Get the nearest minimum clock to 400KHz */
>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>  
> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
> -	if (!ret)
> -		clk_disable_unprepare(host->cfg_div_clk);
> -
> -	return ret;
> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>  }
>  
>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)

Re: [PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Kevin Hilman]

Heiner Kallweit <hkallweit1@gmail.com> writes:

> This clk_disable_unprepare isn't right here. At first the condition
> should be "if (ret)" as the disable/unprepare is supposed to be
> executed if the previous command fails.
> And if the previous command fails and meson_mmc_clk_init returns
> an error, then probe jumps to label free_host where we have this
> disable/unprepare already.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Kevin Hilman <khilman@baylibre.com>

> ---
> v2:
> - extended commit message
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 68e76fa8..850b0152 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>  	/* Get the nearest minimum clock to 400KHz */
>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>  
> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
> -	if (!ret)
> -		clk_disable_unprepare(host->cfg_div_clk);
> -
> -	return ret;
> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>  }
>  
>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)

[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Michał Zegan]

Hello Heiner,

W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
> This clk_disable_unprepare isn't right here. At first the condition
> should be "if (ret)" as the disable/unprepare is supposed to be
> executed if the previous command fails.
> And if the previous command fails and meson_mmc_clk_init returns
> an error, then probe jumps to label free_host where we have this
> disable/unprepare already.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> v2:
> - extended commit message
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 68e76fa8..850b0152 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>  	/* Get the nearest minimum clock to 400KHz */
>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>  
> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
> -	if (!ret)
> -		clk_disable_unprepare(host->cfg_div_clk);
> -
> -	return ret;
> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>  }
>  
>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> 

I see one problem here.
As you said, if the previous command (that is the meson_mmc_clk_set
function call) fails, then the whole meson_mmc_clk_init returns an error
value, and meson_mmc_probe jumps to free_host and disables the clock there.
But what happens if the clk_prepare_enable is the line that fails? in
this case, the function returns an error value too, and in the free_host
meson_mmc_probe tries to disable the clock that is not enabled, and that
probably results in a kernel warning because you tried to disable a
disabled clock.
I was preparing a patch to disable clocks in the probe function only if
they were enabled before, but then the meson_mmc_clk_init function
remains a problem, because we don't know if the clock was enabled
successfully or not when it returns an error.

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Re: [PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Michał Zegan]

[-- Attachment #1.1: Type: text/plain, Size: 2124 bytes --]

Hello Heiner,

W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
> This clk_disable_unprepare isn't right here. At first the condition
> should be "if (ret)" as the disable/unprepare is supposed to be
> executed if the previous command fails.
> And if the previous command fails and meson_mmc_clk_init returns
> an error, then probe jumps to label free_host where we have this
> disable/unprepare already.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> v2:
> - extended commit message
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 68e76fa8..850b0152 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>  	/* Get the nearest minimum clock to 400KHz */
>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>  
> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
> -	if (!ret)
> -		clk_disable_unprepare(host->cfg_div_clk);
> -
> -	return ret;
> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>  }
>  
>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> 

I see one problem here.
As you said, if the previous command (that is the meson_mmc_clk_set
function call) fails, then the whole meson_mmc_clk_init returns an error
value, and meson_mmc_probe jumps to free_host and disables the clock there.
But what happens if the clk_prepare_enable is the line that fails? in
this case, the function returns an error value too, and in the free_host
meson_mmc_probe tries to disable the clock that is not enabled, and that
probably results in a kernel warning because you tried to disable a
disabled clock.
I was preparing a patch to disable clocks in the probe function only if
they were enabled before, but then the meson_mmc_clk_init function
remains a problem, because we don't know if the clock was enabled
successfully or not when it returns an error.


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[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Heiner Kallweit]

Am 18.02.2017 um 04:44 schrieb Micha? Zegan:
> Hello Heiner,
> 
> W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
>> This clk_disable_unprepare isn't right here. At first the condition
>> should be "if (ret)" as the disable/unprepare is supposed to be
>> executed if the previous command fails.
>> And if the previous command fails and meson_mmc_clk_init returns
>> an error, then probe jumps to label free_host where we have this
>> disable/unprepare already.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>> ---
>> v2:
>> - extended commit message
>> ---
>>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>>  1 file changed, 1 insertion(+), 5 deletions(-)
>>
>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>> index 68e76fa8..850b0152 100644
>> --- a/drivers/mmc/host/meson-gx-mmc.c
>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>  	/* Get the nearest minimum clock to 400KHz */
>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>  
>> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>> -	if (!ret)
>> -		clk_disable_unprepare(host->cfg_div_clk);
>> -
>> -	return ret;
>> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>>  }
>>  
>>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>
> 
> I see one problem here.
> As you said, if the previous command (that is the meson_mmc_clk_set
> function call) fails, then the whole meson_mmc_clk_init returns an error
> value, and meson_mmc_probe jumps to free_host and disables the clock there.
> But what happens if the clk_prepare_enable is the line that fails? in
> this case, the function returns an error value too, and in the free_host
> meson_mmc_probe tries to disable the clock that is not enabled, and that
> probably results in a kernel warning because you tried to disable a
> disabled clock.
> I was preparing a patch to disable clocks in the probe function only if
> they were enabled before, but then the meson_mmc_clk_init function
> remains a problem, because we don't know if the clock was enabled
> successfully or not when it returns an error.
> 
Thanks for pointing out, you're right. The solution however should be
quite easy. I meson_mmc_clk_init we just change the condition of
the disable/unprepare to "if (ret)" and in probe we remove this
disable/unprepare from the error path.

[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Heiner Kallweit]

Am 18.02.2017 um 11:37 schrieb Heiner Kallweit:
> Am 18.02.2017 um 04:44 schrieb Micha? Zegan:
>> Hello Heiner,
>>
>> W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
>>> This clk_disable_unprepare isn't right here. At first the condition
>>> should be "if (ret)" as the disable/unprepare is supposed to be
>>> executed if the previous command fails.
>>> And if the previous command fails and meson_mmc_clk_init returns
>>> an error, then probe jumps to label free_host where we have this
>>> disable/unprepare already.
>>>
>>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>>> ---
>>> v2:
>>> - extended commit message
>>> ---
>>>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>>>  1 file changed, 1 insertion(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>>> index 68e76fa8..850b0152 100644
>>> --- a/drivers/mmc/host/meson-gx-mmc.c
>>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>>> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>>  	/* Get the nearest minimum clock to 400KHz */
>>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>>  
>>> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>>> -	if (!ret)
>>> -		clk_disable_unprepare(host->cfg_div_clk);
>>> -
>>> -	return ret;
>>> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>>>  }
>>>  
>>>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>>
>>
>> I see one problem here.
>> As you said, if the previous command (that is the meson_mmc_clk_set
>> function call) fails, then the whole meson_mmc_clk_init returns an error
>> value, and meson_mmc_probe jumps to free_host and disables the clock there.
>> But what happens if the clk_prepare_enable is the line that fails? in
>> this case, the function returns an error value too, and in the free_host
>> meson_mmc_probe tries to disable the clock that is not enabled, and that
>> probably results in a kernel warning because you tried to disable a
>> disabled clock.
>> I was preparing a patch to disable clocks in the probe function only if
>> they were enabled before, but then the meson_mmc_clk_init function
>> remains a problem, because we don't know if the clock was enabled
>> successfully or not when it returns an error.
>>
> Thanks for pointing out, you're right. The solution however should be
> quite easy. I meson_mmc_clk_init we just change the condition of
> the disable/unprepare to "if (ret)" and in probe we remove this
> disable/unprepare from the error path.
> 
This was a little too fast, it's not that easy. But I'll come up with
a changed version.

Re: [PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Heiner Kallweit]

Am 18.02.2017 um 11:37 schrieb Heiner Kallweit:
> Am 18.02.2017 um 04:44 schrieb Michał Zegan:
>> Hello Heiner,
>>
>> W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
>>> This clk_disable_unprepare isn't right here. At first the condition
>>> should be "if (ret)" as the disable/unprepare is supposed to be
>>> executed if the previous command fails.
>>> And if the previous command fails and meson_mmc_clk_init returns
>>> an error, then probe jumps to label free_host where we have this
>>> disable/unprepare already.
>>>
>>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>>> ---
>>> v2:
>>> - extended commit message
>>> ---
>>>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>>>  1 file changed, 1 insertion(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>>> index 68e76fa8..850b0152 100644
>>> --- a/drivers/mmc/host/meson-gx-mmc.c
>>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>>> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>>  	/* Get the nearest minimum clock to 400KHz */
>>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>>  
>>> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>>> -	if (!ret)
>>> -		clk_disable_unprepare(host->cfg_div_clk);
>>> -
>>> -	return ret;
>>> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>>>  }
>>>  
>>>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>>
>>
>> I see one problem here.
>> As you said, if the previous command (that is the meson_mmc_clk_set
>> function call) fails, then the whole meson_mmc_clk_init returns an error
>> value, and meson_mmc_probe jumps to free_host and disables the clock there.
>> But what happens if the clk_prepare_enable is the line that fails? in
>> this case, the function returns an error value too, and in the free_host
>> meson_mmc_probe tries to disable the clock that is not enabled, and that
>> probably results in a kernel warning because you tried to disable a
>> disabled clock.
>> I was preparing a patch to disable clocks in the probe function only if
>> they were enabled before, but then the meson_mmc_clk_init function
>> remains a problem, because we don't know if the clock was enabled
>> successfully or not when it returns an error.
>>
> Thanks for pointing out, you're right. The solution however should be
> quite easy. I meson_mmc_clk_init we just change the condition of
> the disable/unprepare to "if (ret)" and in probe we remove this
> disable/unprepare from the error path.
> 
This was a little too fast, it's not that easy. But I'll come up with
a changed version.

[PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Michał Zegan]

W dniu 18.02.2017 o 11:37, Heiner Kallweit pisze:
> Am 18.02.2017 um 04:44 schrieb Micha? Zegan:
>> Hello Heiner,
>>
>> W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
>>> This clk_disable_unprepare isn't right here. At first the condition
>>> should be "if (ret)" as the disable/unprepare is supposed to be
>>> executed if the previous command fails.
>>> And if the previous command fails and meson_mmc_clk_init returns
>>> an error, then probe jumps to label free_host where we have this
>>> disable/unprepare already.
>>>
>>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>>> ---
>>> v2:
>>> - extended commit message
>>> ---
>>>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>>>  1 file changed, 1 insertion(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>>> index 68e76fa8..850b0152 100644
>>> --- a/drivers/mmc/host/meson-gx-mmc.c
>>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>>> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>>  	/* Get the nearest minimum clock to 400KHz */
>>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>>  
>>> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>>> -	if (!ret)
>>> -		clk_disable_unprepare(host->cfg_div_clk);
>>> -
>>> -	return ret;
>>> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>>>  }
>>>  
>>>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>>
>>
>> I see one problem here.
>> As you said, if the previous command (that is the meson_mmc_clk_set
>> function call) fails, then the whole meson_mmc_clk_init returns an error
>> value, and meson_mmc_probe jumps to free_host and disables the clock there.
>> But what happens if the clk_prepare_enable is the line that fails? in
>> this case, the function returns an error value too, and in the free_host
>> meson_mmc_probe tries to disable the clock that is not enabled, and that
>> probably results in a kernel warning because you tried to disable a
>> disabled clock.
>> I was preparing a patch to disable clocks in the probe function only if
>> they were enabled before, but then the meson_mmc_clk_init function
>> remains a problem, because we don't know if the clock was enabled
>> successfully or not when it returns an error.
>>
> Thanks for pointing out, you're right. The solution however should be
> quite easy. I meson_mmc_clk_init we just change the condition of
> the disable/unprepare to "if (ret)" and in probe we remove this
> disable/unprepare from the error path.
> 
If you do that, then if something fails *after* the meson_mmc_clk_init
returns success, but something else fails later, then you will end up
not disabling those clocks. What I thought about is: change the
condition as you said. but in meson_mmc_probe, either check if clock is
enabled in free_host before disabling it, or have two additional error
passes: one used after the core_clk is enabled (currently if it fails
then it will also be a kernel warning), and one used after the
meson_mmc_clk_init returns success that would also disable the div
clock. Not sure if that second one is appropriate or not.
> 
> _______________________________________________
> linux-amlogic mailing list
> linux-amlogic at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-amlogic
> 

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Re: [PATCH v2 6/9] mmc: meson-gx: remove unneeded meson_mmc_clk_set in meson_mmc_clk_init

[Michał Zegan]

[-- Attachment #1.1: Type: text/plain, Size: 3400 bytes --]



W dniu 18.02.2017 o 11:37, Heiner Kallweit pisze:
> Am 18.02.2017 um 04:44 schrieb Michał Zegan:
>> Hello Heiner,
>>
>> W dniu 16.02.2017 o 20:42, Heiner Kallweit pisze:
>>> This clk_disable_unprepare isn't right here. At first the condition
>>> should be "if (ret)" as the disable/unprepare is supposed to be
>>> executed if the previous command fails.
>>> And if the previous command fails and meson_mmc_clk_init returns
>>> an error, then probe jumps to label free_host where we have this
>>> disable/unprepare already.
>>>
>>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>>> ---
>>> v2:
>>> - extended commit message
>>> ---
>>>  drivers/mmc/host/meson-gx-mmc.c | 6 +-----
>>>  1 file changed, 1 insertion(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>>> index 68e76fa8..850b0152 100644
>>> --- a/drivers/mmc/host/meson-gx-mmc.c
>>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>>> @@ -320,11 +320,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>>  	/* Get the nearest minimum clock to 400KHz */
>>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>>  
>>> -	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>>> -	if (!ret)
>>> -		clk_disable_unprepare(host->cfg_div_clk);
>>> -
>>> -	return ret;
>>> +	return meson_mmc_clk_set(host, host->mmc->f_min);
>>>  }
>>>  
>>>  static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>>
>>
>> I see one problem here.
>> As you said, if the previous command (that is the meson_mmc_clk_set
>> function call) fails, then the whole meson_mmc_clk_init returns an error
>> value, and meson_mmc_probe jumps to free_host and disables the clock there.
>> But what happens if the clk_prepare_enable is the line that fails? in
>> this case, the function returns an error value too, and in the free_host
>> meson_mmc_probe tries to disable the clock that is not enabled, and that
>> probably results in a kernel warning because you tried to disable a
>> disabled clock.
>> I was preparing a patch to disable clocks in the probe function only if
>> they were enabled before, but then the meson_mmc_clk_init function
>> remains a problem, because we don't know if the clock was enabled
>> successfully or not when it returns an error.
>>
> Thanks for pointing out, you're right. The solution however should be
> quite easy. I meson_mmc_clk_init we just change the condition of
> the disable/unprepare to "if (ret)" and in probe we remove this
> disable/unprepare from the error path.
> 
If you do that, then if something fails *after* the meson_mmc_clk_init
returns success, but something else fails later, then you will end up
not disabling those clocks. What I thought about is: change the
condition as you said. but in meson_mmc_probe, either check if clock is
enabled in free_host before disabling it, or have two additional error
passes: one used after the core_clk is enabled (currently if it fails
then it will also be a kernel warning), and one used after the
meson_mmc_clk_init returns success that would also disable the div
clock. Not sure if that second one is appropriate or not.
> 
> _______________________________________________
> linux-amlogic mailing list
> linux-amlogic@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-amlogic
> 


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[PATCH v2 7/9] mmc: meson-gx: remove unneeded devm_kstrdup in meson_mmc_clk_init

[Heiner Kallweit]

CLK core does a deep copy of init.name, therefore it's fully ok to
provide a local variable.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- fixed commit message
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 850b0152..a8f43cc6 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -281,7 +281,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
 
 	/* create the divider */
 	snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
-	init.name = devm_kstrdup(host->dev, clk_name, GFP_KERNEL);
+	init.name = clk_name;
 	init.ops = &clk_divider_ops;
 	init.flags = CLK_SET_RATE_PARENT;
 	clk_div_parents[0] = __clk_get_name(host->mux_clk);
-- 
2.11.1

[PATCH v2 7/9] mmc: meson-gx: remove unneeded devm_kstrdup in meson_mmc_clk_init

[Heiner Kallweit]

CLK core does a deep copy of init.name, therefore it's fully ok to
provide a local variable.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- fixed commit message
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 850b0152..a8f43cc6 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -281,7 +281,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
 
 	/* create the divider */
 	snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
-	init.name = devm_kstrdup(host->dev, clk_name, GFP_KERNEL);
+	init.name = clk_name;
 	init.ops = &clk_divider_ops;
 	init.flags = CLK_SET_RATE_PARENT;
 	clk_div_parents[0] = __clk_get_name(host->mux_clk);
-- 
2.11.1

[PATCH v2 8/9] mmc: meson-gx: improve initial configuration

[Heiner Kallweit]

Config values which are not changed during runtime we can set
in the probe function already.
The block size setting is overwritten later in
meson_mmc_start_cmd anyway if needed, so it doesn't harm if we
remove this setting in meson_mmc_set_ios.

In addition:
- write config register only if configuration changed
- Initialize clocks after other config registers have been initialized

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index a8f43cc6..e7c3ac1c 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -390,15 +390,6 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	val &= ~(CFG_BUS_WIDTH_MASK << CFG_BUS_WIDTH_SHIFT);
 	val |= bus_width << CFG_BUS_WIDTH_SHIFT;
 
-	val &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
-	val |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
-
-	val &= ~(CFG_RESP_TIMEOUT_MASK << CFG_RESP_TIMEOUT_SHIFT);
-	val |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
-
-	val &= ~(CFG_RC_CC_MASK << CFG_RC_CC_SHIFT);
-	val |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
-
 	val &= ~CFG_DDR;
 	if (ios->timing == MMC_TIMING_UHS_DDR50 ||
 	    ios->timing == MMC_TIMING_MMC_DDR52 ||
@@ -409,11 +400,11 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	if (ios->timing == MMC_TIMING_MMC_HS400)
 		val |= CFG_CHK_DS;
 
-	writel(val, host->regs + SD_EMMC_CFG);
-
-	if (val != orig)
+	if (val != orig) {
+		writel(val, host->regs + SD_EMMC_CFG);
 		dev_dbg(host->dev, "%s: SD_EMMC_CFG: 0x%08x -> 0x%08x\n",
 			__func__, orig, val);
+	}
 }
 
 static void meson_mmc_request_done(struct mmc_host *mmc,
@@ -691,6 +682,17 @@ static int meson_mmc_get_cd(struct mmc_host *mmc)
 	return status;
 }
 
+static void meson_mmc_cfg_init(struct meson_host *host)
+{
+	u32 cfg = 0;
+
+	cfg |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
+	cfg |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
+	cfg |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
+
+	writel(cfg, host->regs + SD_EMMC_CFG);
+}
+
 static const struct mmc_host_ops meson_mmc_ops = {
 	.request	= meson_mmc_request,
 	.set_ios	= meson_mmc_set_ios,
@@ -751,10 +753,6 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	if (ret)
 		goto free_host;
 
-	ret = meson_mmc_clk_init(host);
-	if (ret)
-		goto free_host;
-
 	/* Stop execution */
 	writel(0, host->regs + SD_EMMC_START);
 
@@ -763,6 +761,13 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
 
+	/* set config to sane default */
+	meson_mmc_cfg_init(host);
+
+	ret = meson_mmc_clk_init(host);
+	if (ret)
+		goto free_host;
+
 	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
 					meson_mmc_irq_thread, IRQF_SHARED,
 					DRIVER_NAME, host);
-- 
2.11.1

[PATCH v2 8/9] mmc: meson-gx: improve initial configuration

[Heiner Kallweit]

Config values which are not changed during runtime we can set
in the probe function already.
The block size setting is overwritten later in
meson_mmc_start_cmd anyway if needed, so it doesn't harm if we
remove this setting in meson_mmc_set_ios.

In addition:
- write config register only if configuration changed
- Initialize clocks after other config registers have been initialized

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index a8f43cc6..e7c3ac1c 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -390,15 +390,6 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	val &= ~(CFG_BUS_WIDTH_MASK << CFG_BUS_WIDTH_SHIFT);
 	val |= bus_width << CFG_BUS_WIDTH_SHIFT;
 
-	val &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
-	val |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
-
-	val &= ~(CFG_RESP_TIMEOUT_MASK << CFG_RESP_TIMEOUT_SHIFT);
-	val |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
-
-	val &= ~(CFG_RC_CC_MASK << CFG_RC_CC_SHIFT);
-	val |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
-
 	val &= ~CFG_DDR;
 	if (ios->timing == MMC_TIMING_UHS_DDR50 ||
 	    ios->timing == MMC_TIMING_MMC_DDR52 ||
@@ -409,11 +400,11 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	if (ios->timing == MMC_TIMING_MMC_HS400)
 		val |= CFG_CHK_DS;
 
-	writel(val, host->regs + SD_EMMC_CFG);
-
-	if (val != orig)
+	if (val != orig) {
+		writel(val, host->regs + SD_EMMC_CFG);
 		dev_dbg(host->dev, "%s: SD_EMMC_CFG: 0x%08x -> 0x%08x\n",
 			__func__, orig, val);
+	}
 }
 
 static void meson_mmc_request_done(struct mmc_host *mmc,
@@ -691,6 +682,17 @@ static int meson_mmc_get_cd(struct mmc_host *mmc)
 	return status;
 }
 
+static void meson_mmc_cfg_init(struct meson_host *host)
+{
+	u32 cfg = 0;
+
+	cfg |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
+	cfg |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
+	cfg |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
+
+	writel(cfg, host->regs + SD_EMMC_CFG);
+}
+
 static const struct mmc_host_ops meson_mmc_ops = {
 	.request	= meson_mmc_request,
 	.set_ios	= meson_mmc_set_ios,
@@ -751,10 +753,6 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	if (ret)
 		goto free_host;
 
-	ret = meson_mmc_clk_init(host);
-	if (ret)
-		goto free_host;
-
 	/* Stop execution */
 	writel(0, host->regs + SD_EMMC_START);
 
@@ -763,6 +761,13 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
 	writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
 
+	/* set config to sane default */
+	meson_mmc_cfg_init(host);
+
+	ret = meson_mmc_clk_init(host);
+	if (ret)
+		goto free_host;
+
 	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
 					meson_mmc_irq_thread, IRQF_SHARED,
 					DRIVER_NAME, host);
-- 
2.11.1

[PATCH v2 9/9] mmc: meson-gx: remove member mrq from struct meson_host

[Heiner Kallweit]

Struct mmc_command includes a reference to the related mmc_request.
Therefore we don't have to store mrq separately in struct meson_host.
And we can remove some now unneeded WARN_ON's.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- extended commit message
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index e7c3ac1c..3c35cf1f 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -122,7 +122,6 @@
 struct meson_host {
 	struct	device		*dev;
 	struct	mmc_host	*mmc;
-	struct	mmc_request	*mrq;
 	struct	mmc_command	*cmd;
 
 	spinlock_t lock;
@@ -412,9 +411,6 @@ static void meson_mmc_request_done(struct mmc_host *mmc,
 {
 	struct meson_host *host = mmc_priv(mmc);
 
-	WARN_ON(host->mrq != mrq);
-
-	host->mrq = NULL;
 	host->cmd = NULL;
 	mmc_request_done(host->mmc, mrq);
 }
@@ -521,13 +517,9 @@ static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 {
 	struct meson_host *host = mmc_priv(mmc);
 
-	WARN_ON(host->mrq != NULL);
-
 	/* Stop execution */
 	writel(0, host->regs + SD_EMMC_START);
 
-	host->mrq = mrq;
-
 	if (mrq->sbc)
 		meson_mmc_start_cmd(mmc, mrq->sbc);
 	else
@@ -551,7 +543,6 @@ static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 {
 	struct meson_host *host = dev_id;
-	struct mmc_request *mrq;
 	struct mmc_command *cmd;
 	u32 irq_en, status, raw_status;
 	irqreturn_t ret = IRQ_HANDLED;
@@ -561,11 +552,6 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 
 	cmd = host->cmd;
 
-	mrq = host->mrq;
-
-	if (WARN_ON(!mrq))
-		return IRQ_NONE;
-
 	if (WARN_ON(!cmd))
 		return IRQ_NONE;
 
@@ -612,7 +598,7 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 	else  {
 		dev_warn(host->dev, "Unknown IRQ! status=0x%04x: MMC CMD%u arg=0x%08x flags=0x%08x stop=%d\n",
 			 status, cmd->opcode, cmd->arg,
-			 cmd->flags, mrq->stop ? 1 : 0);
+			 cmd->flags, cmd->mrq->stop ? 1 : 0);
 		if (cmd->data) {
 			struct mmc_data *data = cmd->data;
 
@@ -639,14 +625,10 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
 {
 	struct meson_host *host = dev_id;
-	struct mmc_request *mrq = host->mrq;
 	struct mmc_command *cmd = host->cmd;
 	struct mmc_data *data;
 	unsigned int xfer_bytes;
 
-	if (WARN_ON(!mrq))
-		return IRQ_NONE;
-
 	if (WARN_ON(!cmd))
 		return IRQ_NONE;
 
@@ -660,8 +642,8 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
 	}
 
 	meson_mmc_read_resp(host->mmc, cmd);
-	if (!data || !data->stop || mrq->sbc)
-		meson_mmc_request_done(host->mmc, mrq);
+	if (!data || !data->stop || cmd->mrq->sbc)
+		meson_mmc_request_done(host->mmc, cmd->mrq);
 	else
 		meson_mmc_start_cmd(host->mmc, data->stop);
 
-- 
2.11.1

[PATCH v2 9/9] mmc: meson-gx: remove member mrq from struct meson_host

[Heiner Kallweit]

Struct mmc_command includes a reference to the related mmc_request.
Therefore we don't have to store mrq separately in struct meson_host.
And we can remove some now unneeded WARN_ON's.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
---
v2:
- extended commit message
- added acked-by
---
 drivers/mmc/host/meson-gx-mmc.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index e7c3ac1c..3c35cf1f 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -122,7 +122,6 @@
 struct meson_host {
 	struct	device		*dev;
 	struct	mmc_host	*mmc;
-	struct	mmc_request	*mrq;
 	struct	mmc_command	*cmd;
 
 	spinlock_t lock;
@@ -412,9 +411,6 @@ static void meson_mmc_request_done(struct mmc_host *mmc,
 {
 	struct meson_host *host = mmc_priv(mmc);
 
-	WARN_ON(host->mrq != mrq);
-
-	host->mrq = NULL;
 	host->cmd = NULL;
 	mmc_request_done(host->mmc, mrq);
 }
@@ -521,13 +517,9 @@ static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 {
 	struct meson_host *host = mmc_priv(mmc);
 
-	WARN_ON(host->mrq != NULL);
-
 	/* Stop execution */
 	writel(0, host->regs + SD_EMMC_START);
 
-	host->mrq = mrq;
-
 	if (mrq->sbc)
 		meson_mmc_start_cmd(mmc, mrq->sbc);
 	else
@@ -551,7 +543,6 @@ static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
 static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 {
 	struct meson_host *host = dev_id;
-	struct mmc_request *mrq;
 	struct mmc_command *cmd;
 	u32 irq_en, status, raw_status;
 	irqreturn_t ret = IRQ_HANDLED;
@@ -561,11 +552,6 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 
 	cmd = host->cmd;
 
-	mrq = host->mrq;
-
-	if (WARN_ON(!mrq))
-		return IRQ_NONE;
-
 	if (WARN_ON(!cmd))
 		return IRQ_NONE;
 
@@ -612,7 +598,7 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 	else  {
 		dev_warn(host->dev, "Unknown IRQ! status=0x%04x: MMC CMD%u arg=0x%08x flags=0x%08x stop=%d\n",
 			 status, cmd->opcode, cmd->arg,
-			 cmd->flags, mrq->stop ? 1 : 0);
+			 cmd->flags, cmd->mrq->stop ? 1 : 0);
 		if (cmd->data) {
 			struct mmc_data *data = cmd->data;
 
@@ -639,14 +625,10 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
 {
 	struct meson_host *host = dev_id;
-	struct mmc_request *mrq = host->mrq;
 	struct mmc_command *cmd = host->cmd;
 	struct mmc_data *data;
 	unsigned int xfer_bytes;
 
-	if (WARN_ON(!mrq))
-		return IRQ_NONE;
-
 	if (WARN_ON(!cmd))
 		return IRQ_NONE;
 
@@ -660,8 +642,8 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
 	}
 
 	meson_mmc_read_resp(host->mmc, cmd);
-	if (!data || !data->stop || mrq->sbc)
-		meson_mmc_request_done(host->mmc, mrq);
+	if (!data || !data->stop || cmd->mrq->sbc)
+		meson_mmc_request_done(host->mmc, cmd->mrq);
 	else
 		meson_mmc_start_cmd(host->mmc, data->stop);
 
-- 
2.11.1