diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/808-i2c-0005-MLK-20773-i2c-imx-add-a-limit-of-maximum-transfer-sp.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/808-i2c-0005-MLK-20773-i2c-imx-add-a-limit-of-maximum-transfer-sp.patch | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/target/linux/layerscape/patches-5.4/808-i2c-0005-MLK-20773-i2c-imx-add-a-limit-of-maximum-transfer-sp.patch b/target/linux/layerscape/patches-5.4/808-i2c-0005-MLK-20773-i2c-imx-add-a-limit-of-maximum-transfer-sp.patch deleted file mode 100644 index 5f62b3f153..0000000000 --- a/target/linux/layerscape/patches-5.4/808-i2c-0005-MLK-20773-i2c-imx-add-a-limit-of-maximum-transfer-sp.patch +++ /dev/null @@ -1,94 +0,0 @@ -From ede2da5ea630fa2431145992c43aef51fc9c5c5a Mon Sep 17 00:00:00 2001 -From: Clark Wang <xiaoning.wang@nxp.com> -Date: Fri, 18 Jan 2019 12:00:16 +0800 -Subject: [PATCH] MLK-20773 i2c-imx: add a limit of maximum transfer speed for - imx7d - -According the e7805 in Errata, the SCK low level period should be less -than 1.3us. - -The other series platform use this same IP can match the errata, and -ensure the low level period longer than 1.3us when the speed set to -400KHz. However, only at imx7d platform, the low level period is less -than 1.3us in the same situation. - -Therefore, limit the maximum transfer speed to 384KHz when probe at -imx7d platform. - -Signed-off-by: Clark Wang <xiaoning.wang@nxp.com> -(cherry picked from commit 19f553846e872b5c379b37ed029132b79566cab0) -(cherry picked from commit 5d355407812025e5157f82b7763580e7295a40fd) ---- - drivers/i2c/busses/i2c-imx.c | 26 ++++++++++++++++++++++++++ - 1 file changed, 26 insertions(+) - ---- a/drivers/i2c/busses/i2c-imx.c -+++ b/drivers/i2c/busses/i2c-imx.c -@@ -51,6 +51,7 @@ - - /* Default value */ - #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ -+#define IMX_I2C_MAX_E_BIT_RATE 384000 /* 384kHz from e7805 errata*/ - - /* - * Enable DMA if transfer byte size is bigger than this threshold. -@@ -161,6 +162,7 @@ enum imx_i2c_type { - IMX1_I2C, - IMX21_I2C, - VF610_I2C, -+ IMX7D_I2C, - }; - - struct imx_i2c_hwdata { -@@ -235,6 +237,16 @@ static struct imx_i2c_hwdata vf610_i2c_h - - }; - -+static const struct imx_i2c_hwdata imx7d_i2c_hwdata = { -+ .devtype = IMX7D_I2C, -+ .regshift = IMX_I2C_REGSHIFT, -+ .clk_div = imx_i2c_clk_div, -+ .ndivs = ARRAY_SIZE(imx_i2c_clk_div), -+ .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, -+ .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, -+ -+}; -+ - static const struct platform_device_id imx_i2c_devtype[] = { - { - .name = "imx1-i2c", -@@ -252,6 +264,7 @@ static const struct of_device_id i2c_imx - { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, - { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, - { .compatible = "fsl,vf610-i2c", .data = &vf610_i2c_hwdata, }, -+ { .compatible = "fsl,imx7d-i2c", .data = &imx7d_i2c_hwdata, }, - { /* sentinel */ } - }; - MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids); -@@ -267,6 +280,11 @@ static inline int is_imx1_i2c(struct imx - return i2c_imx->hwdata->devtype == IMX1_I2C; - } - -+static inline int is_imx7d_i2c(struct imx_i2c_struct *i2c_imx) -+{ -+ return i2c_imx->hwdata->devtype == IMX7D_I2C; -+} -+ - static inline void imx_i2c_write_reg(unsigned int val, - struct imx_i2c_struct *i2c_imx, unsigned int reg) - { -@@ -1187,6 +1205,14 @@ static int i2c_imx_probe(struct platform - clk_notifier_register(i2c_imx->clk, &i2c_imx->clk_change_nb); - i2c_imx_set_clk(i2c_imx, clk_get_rate(i2c_imx->clk)); - -+ /* -+ * This limit caused by an i.MX7D hardware issue(e7805 in Errata). -+ * If there is no limit, when the bitrate set up to 400KHz, it will -+ * cause the SCK low level period less than 1.3us. -+ */ -+ if (is_imx7d_i2c(i2c_imx) && i2c_imx->bitrate > IMX_I2C_MAX_E_BIT_RATE) -+ i2c_imx->bitrate = IMX_I2C_MAX_E_BIT_RATE; -+ - /* Set up chip registers to defaults */ - imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, - i2c_imx, IMX_I2C_I2CR); |