[PATCH v3 0/4] mmx: mxs-mmc: Some cleanups and fixes for the MXS MMC subsystem

[PATCH v3 0/4] mmx: mxs-mmc: Some cleanups and fixes for the MXS MMC subsystem

[Lothar Waßmann]

Lothar Waßmann (4):
  Fix grammatical error in comment
  Some cleanups for the MMC driver
  Check the return codes of clk_enable() and mxs_reset_block()
  Add an appropriate MODULE_ALIAS

Changes wrt v2:
 - add missing Acked-by's
 - changed subject-prefix

 drivers/mmc/host/mxs-mmc.c |   87 +++++++++++++++++++++++++++------------------
 1 file changed, 54 insertions(+), 33 deletions(-)

[PATCH v3 1/4] mmc: mxs-mmc: Fix grammatical error in comment

[Lothar Waßmann]

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
---
 arch/arm/mach-mxs/clock-mx28.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-mxs/clock-mx28.c b/arch/arm/mach-mxs/clock-mx28.c
index da6e4aa..fc86b04 100644
--- a/arch/arm/mach-mxs/clock-mx28.c
+++ b/arch/arm/mach-mxs/clock-mx28.c
@@ -554,7 +554,7 @@ static struct clk rtc_clk = {
 	.parent = &ref_xtal_clk,
 };
 
-/* usb_clk gate is controlled in DIGCTRL other than CLKCTRL */
+/* usb_clk gate is controlled in DIGCTRL rather than CLKCTRL */
 static struct clk usb0_clk = {
 	.enable_reg = DIGCTRL_BASE_ADDR,
 	.enable_shift = 2,
-- 
1.5.6.5

[PATCH v3 2/4] mmc: mxs-mmc: Some cleanups for the MMC driver

[Lothar Waßmann]

 - Remove bogus parens around numerical arguments in #define's
 - When defining bit masks, use the #def for the shift count
   instead of repeating the numbers
 - Remove 'break' at end of switch statement


Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/mmc/host/mxs-mmc.c |   60 ++++++++++++++++++++++++---------------------
 1 file changed, 32 insertions(+), 28 deletions(-)
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 99b449d..a9b70d2 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -47,7 +47,7 @@
 #define DRIVER_NAME	"mxs-mmc"
 
 /* card detect polling timeout */
-#define MXS_MMC_DETECT_TIMEOUT			(HZ/2)
+#define MXS_MMC_DETECT_TIMEOUT			(HZ / 2)
 
 #define SSP_VERSION_LATEST	4
 #define ssp_is_old()		(host->version < SSP_VERSION_LATEST)
@@ -59,39 +59,43 @@
 #define  BM_SSP_CTRL0_IGNORE_CRC		(1 << 26)
 #define  BM_SSP_CTRL0_READ			(1 << 25)
 #define  BM_SSP_CTRL0_DATA_XFER			(1 << 24)
-#define  BP_SSP_CTRL0_BUS_WIDTH			(22)
-#define  BM_SSP_CTRL0_BUS_WIDTH			(0x3 << 22)
+#define  BP_SSP_CTRL0_BUS_WIDTH			22
+#define  BM_SSP_CTRL0_BUS_WIDTH			(0x3 << BP_SSP_CTRL0_BUS_WIDTH)
 #define  BM_SSP_CTRL0_WAIT_FOR_IRQ		(1 << 21)
 #define  BM_SSP_CTRL0_LONG_RESP			(1 << 19)
 #define  BM_SSP_CTRL0_GET_RESP			(1 << 17)
 #define  BM_SSP_CTRL0_ENABLE			(1 << 16)
-#define  BP_SSP_CTRL0_XFER_COUNT		(0)
-#define  BM_SSP_CTRL0_XFER_COUNT		(0xffff)
+#define  BP_SSP_CTRL0_XFER_COUNT		0
+#define  BM_SSP_CTRL0_XFER_COUNT		0xffff
 #define HW_SSP_CMD0				0x010
 #define  BM_SSP_CMD0_DBL_DATA_RATE_EN		(1 << 25)
 #define  BM_SSP_CMD0_SLOW_CLKING_EN		(1 << 22)
 #define  BM_SSP_CMD0_CONT_CLKING_EN		(1 << 21)
 #define  BM_SSP_CMD0_APPEND_8CYC		(1 << 20)
-#define  BP_SSP_CMD0_BLOCK_SIZE			(16)
-#define  BM_SSP_CMD0_BLOCK_SIZE			(0xf << 16)
-#define  BP_SSP_CMD0_BLOCK_COUNT		(8)
-#define  BM_SSP_CMD0_BLOCK_COUNT		(0xff << 8)
-#define  BP_SSP_CMD0_CMD			(0)
-#define  BM_SSP_CMD0_CMD			(0xff)
+#define  BP_SSP_CMD0_BLOCK_SIZE			16
+#define  BM_SSP_CMD0_BLOCK_SIZE			(0xf << BP_SSP_CMD0_BLOCK_SIZE)
+#define  BP_SSP_CMD0_BLOCK_COUNT		8
+#define  BM_SSP_CMD0_BLOCK_COUNT		\
+	(0xff << BP_SSP_CMD0_BLOCK_COUNT)
+#define  BP_SSP_CMD0_CMD			0
+#define  BM_SSP_CMD0_CMD			0xff
 #define HW_SSP_CMD1				0x020
 #define HW_SSP_XFER_SIZE			0x030
 #define HW_SSP_BLOCK_SIZE			0x040
-#define  BP_SSP_BLOCK_SIZE_BLOCK_COUNT		(4)
-#define  BM_SSP_BLOCK_SIZE_BLOCK_COUNT		(0xffffff << 4)
-#define  BP_SSP_BLOCK_SIZE_BLOCK_SIZE		(0)
-#define  BM_SSP_BLOCK_SIZE_BLOCK_SIZE		(0xf)
+#define  BP_SSP_BLOCK_SIZE_BLOCK_COUNT		4
+#define  BM_SSP_BLOCK_SIZE_BLOCK_COUNT		\
+	(0xffffff << BP_SSP_BLOCK_SIZE_BLOCK_COUNT)
+#define  BP_SSP_BLOCK_SIZE_BLOCK_SIZE		0
+#define  BM_SSP_BLOCK_SIZE_BLOCK_SIZE		0xf
 #define HW_SSP_TIMING				(ssp_is_old() ? 0x050 : 0x070)
-#define  BP_SSP_TIMING_TIMEOUT			(16)
-#define  BM_SSP_TIMING_TIMEOUT			(0xffff << 16)
-#define  BP_SSP_TIMING_CLOCK_DIVIDE		(8)
-#define  BM_SSP_TIMING_CLOCK_DIVIDE		(0xff << 8)
-#define  BP_SSP_TIMING_CLOCK_RATE		(0)
-#define  BM_SSP_TIMING_CLOCK_RATE		(0xff)
+#define  BP_SSP_TIMING_TIMEOUT			16
+#define  BM_SSP_TIMING_TIMEOUT			\
+	(0xffff << BP_SSP_TIMING_TIMEOUT)
+#define  BP_SSP_TIMING_CLOCK_DIVIDE		8
+#define  BM_SSP_TIMING_CLOCK_DIVIDE		\
+	(0xff << BP_SSP_TIMING_CLOCK_DIVIDE)
+#define  BP_SSP_TIMING_CLOCK_RATE		0
+#define  BM_SSP_TIMING_CLOCK_RATE		0xff
 #define HW_SSP_CTRL1				(ssp_is_old() ? 0x060 : 0x080)
 #define  BM_SSP_CTRL1_SDIO_IRQ			(1 << 31)
 #define  BM_SSP_CTRL1_SDIO_IRQ_EN		(1 << 30)
@@ -111,10 +115,11 @@
 #define  BM_SSP_CTRL1_FIFO_OVERRUN_IRQ_EN	(1 << 14)
 #define  BM_SSP_CTRL1_DMA_ENABLE		(1 << 13)
 #define  BM_SSP_CTRL1_POLARITY			(1 << 9)
-#define  BP_SSP_CTRL1_WORD_LENGTH		(4)
-#define  BM_SSP_CTRL1_WORD_LENGTH		(0xf << 4)
-#define  BP_SSP_CTRL1_SSP_MODE			(0)
-#define  BM_SSP_CTRL1_SSP_MODE			(0xf)
+#define  BP_SSP_CTRL1_WORD_LENGTH		4
+#define  BM_SSP_CTRL1_WORD_LENGTH		\
+	(0xf << BP_SSP_CTRL1_WORD_LENGTH)
+#define  BP_SSP_CTRL1_SSP_MODE			0
+#define  BM_SSP_CTRL1_SSP_MODE			0xf
 #define HW_SSP_SDRESP0				(ssp_is_old() ? 0x080 : 0x0a0)
 #define HW_SSP_SDRESP1				(ssp_is_old() ? 0x090 : 0x0b0)
 #define HW_SSP_SDRESP2				(ssp_is_old() ? 0x0a0 : 0x0c0)
@@ -123,7 +128,7 @@
 #define  BM_SSP_STATUS_CARD_DETECT		(1 << 28)
 #define  BM_SSP_STATUS_SDIO_IRQ			(1 << 17)
 #define HW_SSP_VERSION				(cpu_is_mx23() ? 0x110 : 0x130)
-#define  BP_SSP_VERSION_MAJOR			(24)
+#define  BP_SSP_VERSION_MAJOR			24
 
 #define BF_SSP(value, field)	(((value) << BP_SSP_##field) & BM_SSP_##field)
 
@@ -151,7 +156,7 @@ struct mxs_mmc_host {
 	struct clk			*clk;
 	unsigned int			clk_rate;
 
-	struct dma_chan         	*dmach;
+	struct dma_chan			*dmach;
 	struct mxs_dma_data		dma_data;
 	unsigned int			dma_dir;
 	u32				ssp_pio_words[SSP_PIO_NUM];
@@ -550,7 +555,6 @@ static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
 	default:
 		dev_warn(mmc_dev(host->mmc),
 			 "%s: unknown MMC command\n", __func__);
-		break;
 	}
 }
 
-- 
1.5.6.5

[PATCH v3 3/4] mmc: mxs-mmc: Check the return codes of clk_enable() and mxs_reset_block()

[Lothar Waßmann]

Add an int return value to mxs_mmc_reset(), so that the return code of
mxs_reset_block() can be promoted to the caller.
Also check the return code of clk_enable() in the probe function.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
---
 drivers/mmc/host/mxs-mmc.c |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index a9b70d2..0003d03 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -190,11 +190,14 @@ static int mxs_mmc_get_cd(struct mmc_host *mmc)
 		 BM_SSP_STATUS_CARD_DETECT);
 }
 
-static void mxs_mmc_reset(struct mxs_mmc_host *host)
+static int mxs_mmc_reset(struct mxs_mmc_host *host)
 {
+	int ret;
 	u32 ctrl0, ctrl1;
 
-	mxs_reset_block(host->base);
+	ret = mxs_reset_block(host->base);
+	if (ret)
+		return ret;
 
 	ctrl0 = BM_SSP_CTRL0_IGNORE_CRC;
 	ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) |
@@ -219,6 +222,7 @@ static void mxs_mmc_reset(struct mxs_mmc_host *host)
 
 	writel(ctrl0, host->base + HW_SSP_CTRL0);
 	writel(ctrl1, host->base + HW_SSP_CTRL1);
+	return 0;
 }
 
 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
@@ -717,9 +721,19 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 		ret = PTR_ERR(host->clk);
 		goto out_iounmap;
 	}
-	clk_enable(host->clk);
+	ret = clk_enable(host->clk);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc),
+			"%s: failed to enable clock: %d\n", __func__, ret);
+		goto out_clk_put;
+	}
 
-	mxs_mmc_reset(host);
+	ret = mxs_mmc_reset(host);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc),
+			"%s: failed to reset controller: %d\n", __func__, ret);
+		goto out_clk_put;
+	}
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
@@ -834,7 +848,9 @@ static int mxs_mmc_resume(struct device *dev)
 	struct mxs_mmc_host *host = mmc_priv(mmc);
 	int ret = 0;
 
-	clk_enable(host->clk);
+	ret = clk_enable(host->clk);
+	if (ret)
+		return ret;
 
 	ret = mmc_resume_host(mmc);
 
-- 
1.5.6.5

[PATCH v3 4/4] mmc: mxs-mmc: Add an appropriate MODULE_ALIAS

[Lothar Waßmann]

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
---
 drivers/mmc/host/mxs-mmc.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 0003d03..1ba08ae 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -891,3 +891,4 @@ module_exit(mxs_mmc_exit);
 MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral");
 MODULE_AUTHOR("Freescale Semiconductor");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-mmc");
-- 
1.5.6.5