[patch v3 0/9] rk3399 (Pinebook pro) EDP support

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[patch v3 0/9] rk3399 (Pinebook pro) EDP support

Arnaud Patard (Rtp)
This patchset add support for the rk3399 eDP. It has been tested on the pinebook
pro and Google Kevin chromeos devices.

The changes have been written by studying the linux code, since I didn't find any
manual for theses part of the RK3399 SoC.

On the linux kernel side, on recent kernels, it needs commit "pwm: rockchip: Keep
enabled PWMs running while probing" otherwise the pinebook pro will freeze when probing
the display.

Changes since v2:
- Respect alphabetical order in uboot.dtsi in patch "rk3399-pinebook-pro-u-boot.dtsi: Enable edp"
- drop "configs/pinebook-pro-rk3399_defconfig: enable SYS_USB_EVENT_POLL_VIA_INT_QUEUE"
  (pbp_defconfig_usb_poll.patch) patch, since the same change has been merged with change
  https://gitlab.denx.de/u-boot/custodians/u-boot-rockchip/-/commit/b197c934b11f611dcc1a083d90e68019d1e010cf
- change patch subjects.

Changes since v1:
- Add reset support for the VOP and eDP. This was needed and it appears to also solve
  the issue with warm reset.
- Fix a debug string in the vop driver
- Drop the patch "drivers/video/rockchip/rk_edp.c: Change clock rate".
- Address various comments



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[patch v3 1/9] rockchip: video: vop: Use endpoint compatible string to find VOP mode

Arnaud Patard (Rtp)
The current code is using an hard coded enum and the of node reg value of
endpoint to find out if the endpoint is mipi/hdmi/lvds/edp/dp. The order
is different between rk3288, rk3399 vop little, rk3399 vop big.

A possible solution would be to make sure that the rk3288.dtsi and
rk3399.dtsi files have "expected" reg value or an other solution is
to find the kind of endpoint by comparing the endpoint compatible value.

This patch is implementing the more flexible second solution.

Signed-off-by: Arnaud Patard <[hidden email]>

Index: u-boot/arch/arm/include/asm/arch-rockchip/vop_rk3288.h
===================================================================
--- u-boot.orig/arch/arm/include/asm/arch-rockchip/vop_rk3288.h
+++ u-boot/arch/arm/include/asm/arch-rockchip/vop_rk3288.h
@@ -85,26 +85,13 @@ enum {
  LB_RGB_1280X8 = 0x5
 };
 
-#if defined(CONFIG_ROCKCHIP_RK3399)
 enum vop_modes {
  VOP_MODE_EDP = 0,
  VOP_MODE_MIPI,
  VOP_MODE_HDMI,
- VOP_MODE_MIPI1,
- VOP_MODE_DP,
- VOP_MODE_NONE,
-};
-#else
-enum vop_modes {
- VOP_MODE_EDP = 0,
- VOP_MODE_HDMI,
  VOP_MODE_LVDS,
- VOP_MODE_MIPI,
- VOP_MODE_NONE,
- VOP_MODE_AUTO_DETECT,
- VOP_MODE_UNKNOWN,
+ VOP_MODE_DP,
 };
-#endif
 
 /* VOP_VERSION_INFO */
 #define M_FPGA_VERSION (0xffff << 16)
Index: u-boot/drivers/video/rockchip/rk_vop.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_vop.c
+++ u-boot/drivers/video/rockchip/rk_vop.c
@@ -235,12 +235,11 @@ static int rk_display_init(struct udevic
  struct clk clk;
  enum video_log2_bpp l2bpp;
  ofnode remote;
+ const char *compat;
 
  debug("%s(%s, %lu, %s)\n", __func__,
       dev_read_name(dev), fbbase, ofnode_get_name(ep_node));
 
- vop_id = ofnode_read_s32_default(ep_node, "reg", -1);
- debug("vop_id=%d\n", vop_id);
  ret = ofnode_read_u32(ep_node, "remote-endpoint", &remote_phandle);
  if (ret)
  return ret;
@@ -282,6 +281,28 @@ static int rk_display_init(struct udevic
  if (disp)
  break;
  };
+ compat = ofnode_get_property(remote, "compatible", NULL);
+ if (!compat) {
+ debug("%s(%s): Failed to find compatible property\n",
+      __func__, dev_read_name(dev));
+ return -EINVAL;
+ }
+ if (strstr(compat, "edp")) {
+ vop_id = VOP_MODE_EDP;
+ } else if (strstr(compat, "mipi")) {
+ vop_id = VOP_MODE_MIPI;
+ } else if (strstr(compat, "hdmi")) {
+ vop_id = VOP_MODE_HDMI;
+ } else if (strstr(compat, "cdn-dp")) {
+ vop_id = VOP_MODE_DP;
+ } else if (strstr(compat, "lvds")) {
+ vop_id = VOP_MODE_LVDS;
+ } else {
+ debug("%s(%s): Failed to find vop mode for %s\n",
+      __func__, dev_read_name(dev), compat);
+ return -EINVAL;
+ }
+ debug("vop_id=%d\n", vop_id);
 
  disp_uc_plat = dev_get_uclass_platdata(disp);
  debug("Found device '%s', disp_uc_priv=%p\n", disp->name, disp_uc_plat);


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[patch v3 2/9] rockchip: video: edp: Add rk3399 support

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
According to linux commit "drm/rockchip: analogix_dp: add rk3399 eDP
support" (82872e42bb1501dd9e60ca430f4bae45a469aa64), rk3288 and rk3399
eDP IPs are nearly the same, the difference is in the grf register
(SOC_CON6 versus SOC_CON20). So, change the code to use the right
register on each IP.

The clocks don't seem to be the same, the eDP clock is not at index 1
on rk3399, so don't try changing the clock at index 1 to rate 0 on
rk3399.

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/drivers/video/rockchip/rk_edp.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_edp.c
+++ u-boot/drivers/video/rockchip/rk_edp.c
@@ -17,11 +17,10 @@
 #include <asm/gpio.h>
 #include <asm/io.h>
 #include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/hardware.h>
 #include <asm/arch-rockchip/edp_rk3288.h>
 #include <asm/arch-rockchip/grf_rk3288.h>
-#include <asm/arch-rockchip/hardware.h>
-#include <dt-bindings/clock/rk3288-cru.h>
-#include <linux/delay.h>
+#include <asm/arch-rockchip/grf_rk3399.h>
 
 #define MAX_CR_LOOP 5
 #define MAX_EQ_LOOP 5
@@ -37,18 +36,42 @@ static const char * const pre_emph_names
 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 
+#define RK3288_GRF_SOC_CON6 0x025c
+#define RK3288_GRF_SOC_CON12 0x0274
+#define RK3399_GRF_SOC_CON20 0x6250
+#define RK3399_GRF_SOC_CON25 0x6264
+
+enum rockchip_dp_types {
+ RK3288_DP = 0,
+ RK3399_EDP
+};
+
+struct rockchip_dp_data {
+ unsigned long reg_vop_big_little;
+ unsigned long reg_vop_big_little_sel;
+ unsigned long reg_ref_clk_sel;
+ unsigned long ref_clk_sel_bit;
+ enum rockchip_dp_types chip_type;
+};
+
 struct rk_edp_priv {
  struct rk3288_edp *regs;
- struct rk3288_grf *grf;
+ void *grf;
  struct udevice *panel;
  struct link_train link_train;
  u8 train_set[4];
 };
 
-static void rk_edp_init_refclk(struct rk3288_edp *regs)
+static void rk_edp_init_refclk(struct rk3288_edp *regs, enum rockchip_dp_types chip_type)
 {
  writel(SEL_24M, &regs->analog_ctl_2);
- writel(REF_CLK_24M, &regs->pll_reg_1);
+ u32 reg;
+
+ reg = REF_CLK_24M;
+ if (chip_type == RK3288_DP)
+ reg ^= REF_CLK_MASK;
+ writel(reg, &regs->pll_reg_1);
+
 
  writel(LDO_OUTPUT_V_SEL_145 | KVCO_DEFALUT | CHG_PUMP_CUR_SEL_5US |
        V2L_CUR_SEL_1MA, &regs->pll_reg_2);
@@ -1029,6 +1052,8 @@ static int rk_edp_probe(struct udevice *
  struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
  struct rk_edp_priv *priv = dev_get_priv(dev);
  struct rk3288_edp *regs = priv->regs;
+ struct rockchip_dp_data *edp_data = (struct rockchip_dp_data *)dev_get_driver_data(dev);
+
  struct clk clk;
  int ret;
 
@@ -1043,16 +1068,17 @@ static int rk_edp_probe(struct udevice *
  int vop_id = uc_plat->source_id;
  debug("%s, uc_plat=%p, vop_id=%u\n", __func__, uc_plat, vop_id);
 
- ret = clk_get_by_index(dev, 1, &clk);
- if (ret >= 0) {
- ret = clk_set_rate(&clk, 0);
- clk_free(&clk);
- }
- if (ret) {
- debug("%s: Failed to set EDP clock: ret=%d\n", __func__, ret);
- return ret;
+ if (edp_data->chip_type == RK3288_DP) {
+ ret = clk_get_by_index(dev, 1, &clk);
+ if (ret >= 0) {
+ ret = clk_set_rate(&clk, 0);
+ clk_free(&clk);
+ }
+ if (ret) {
+ debug("%s: Failed to set EDP clock: ret=%d\n", __func__, ret);
+ return ret;
+ }
  }
-
  ret = clk_get_by_index(uc_plat->src_dev, 0, &clk);
  if (ret >= 0) {
  ret = clk_set_rate(&clk, 192000000);
@@ -1065,15 +1091,17 @@ static int rk_edp_probe(struct udevice *
  }
 
  /* grf_edp_ref_clk_sel: from internal 24MHz or 27MHz clock */
- rk_setreg(&priv->grf->soc_con12, 1 << 4);
+ rk_setreg(priv->grf + edp_data->reg_ref_clk_sel,
+  edp_data->ref_clk_sel_bit);
 
  /* select epd signal from vop0 or vop1 */
- rk_clrsetreg(&priv->grf->soc_con6, (1 << 5),
-    (vop_id == 1) ? (1 << 5) : (0 << 5));
+ rk_clrsetreg(priv->grf + edp_data->reg_vop_big_little,
+     edp_data->reg_vop_big_little_sel,
+     (vop_id == 1) ? edp_data->reg_vop_big_little_sel : 0);
 
  rockchip_edp_wait_hpd(priv);
 
- rk_edp_init_refclk(regs);
+ rk_edp_init_refclk(regs, edp_data->chip_type);
  rk_edp_init_interrupt(regs);
  rk_edp_enable_sw_function(regs);
  ret = rk_edp_init_analog_func(regs);
@@ -1089,8 +1117,25 @@ static const struct dm_display_ops dp_ro
  .enable = rk_edp_enable,
 };
 
+static const struct rockchip_dp_data rk3399_edp = {
+ .reg_vop_big_little = RK3399_GRF_SOC_CON20,
+ .reg_vop_big_little_sel = BIT(5),
+ .reg_ref_clk_sel = RK3399_GRF_SOC_CON25,
+ .ref_clk_sel_bit = BIT(11),
+ .chip_type = RK3399_EDP,
+};
+
+static const struct rockchip_dp_data rk3288_dp = {
+ .reg_vop_big_little = RK3288_GRF_SOC_CON6,
+ .reg_vop_big_little_sel = BIT(5),
+ .reg_ref_clk_sel = RK3288_GRF_SOC_CON12,
+ .ref_clk_sel_bit = BIT(4),
+ .chip_type = RK3288_DP,
+};
+
 static const struct udevice_id rockchip_dp_ids[] = {
- { .compatible = "rockchip,rk3288-edp" },
+ { .compatible = "rockchip,rk3288-edp", .data = (ulong)&rk3288_dp },
+ { .compatible = "rockchip,rk3399-edp", .data = (ulong)&rk3399_edp },
  { }
 };
 
Index: u-boot/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
===================================================================
--- u-boot.orig/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
+++ u-boot/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
@@ -232,8 +232,9 @@ check_member(rk3288_edp, pll_reg_5, 0xa0
 #define PD_CH0 (0x1 << 0)
 
 /* pll_reg_1 */
-#define REF_CLK_24M (0x1 << 1)
-#define REF_CLK_27M (0x0 << 1)
+#define REF_CLK_24M (0x1 << 0)
+#define REF_CLK_27M (0x0 << 0)
+#define REF_CLK_MASK (0x1 << 0)
 
 /* line_map */
 #define LANE3_MAP_LOGIC_LANE_0 (0x0 << 6)


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[patch v3 3/9] ockchip: video: edp: Change interrupt polarity configuration

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
The linux code is setting polarity configuration to 3 but
uboot code is setting it to 1. Change the configuration to match the
linux configuration

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
===================================================================
--- u-boot.orig/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
+++ u-boot/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
@@ -297,7 +297,9 @@ check_member(rk3288_edp, pll_reg_5, 0xa0
 
 /* int_ctl */
 #define SOFT_INT_CTRL (0x1 << 2)
-#define INT_POL (0x1 << 0)
+#define INT_POL1 (0x1 << 1)
+#define INT_POL0 (0x1 << 0)
+#define INT_POL (INT_POL0 | INT_POL1)
 
 /* sys_ctl_1 */
 #define DET_STA (0x1 << 2)


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[patch v3 4/9] ockchip: video: vop: Reserve efi fb memory

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
When booting with EFI and graphics, the memory used for framebuffer
has to be reserved, otherwise it may leads to kernel memory
overwrite.

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/drivers/video/rockchip/rk_vop.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_vop.c
+++ u-boot/drivers/video/rockchip/rk_vop.c
@@ -20,6 +20,8 @@
 #include <asm/arch-rockchip/vop_rk3288.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
+#include <efi.h>
+#include <efi_loader.h>
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <power/regulator.h>
@@ -394,6 +396,13 @@ int rk_vop_probe(struct udevice *dev)
  if (!(gd->flags & GD_FLG_RELOC))
  return 0;
 
+ plat->base = gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - plat->size;
+
+#if defined(CONFIG_EFI_LOADER)
+ debug("Adding to EFI map %d @ %lx\n", plat->size, plat->base);
+ efi_add_memory_map(plat->base, plat->size, EFI_RESERVED_MEMORY_TYPE);
+#endif
+
  priv->regs = (struct rk3288_vop *)dev_read_addr(dev);
 
  /*


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[patch v3 5/9] rockchip: Pinebook Pro: Enable edp

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
- uboot rockchip edp code is looking for a rockchip,panel property
  for the edp dts node, so add it.

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/arch/arm/dts/rk3399-pinebook-pro-u-boot.dtsi
===================================================================
--- u-boot.orig/arch/arm/dts/rk3399-pinebook-pro-u-boot.dtsi
+++ u-boot/arch/arm/dts/rk3399-pinebook-pro-u-boot.dtsi
@@ -20,6 +20,10 @@
  };
 };
 
+&edp {
+ rockchip,panel = <&edp_panel>;
+};
+
 &i2c0 {
  u-boot,dm-pre-reloc;
 };


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[patch v3 6/9] rockchip: pwm: Fix default polarity

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
In the code, the default polarity is set to positive/positive,
which is neither normal polarity or inverted polarity. It's
only the hardware default. This leads to booting linux with
wrong polarity setting.

Update the code to use PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE
by default instead.

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/drivers/pwm/rk_pwm.c
===================================================================
--- u-boot.orig/drivers/pwm/rk_pwm.c
+++ u-boot/drivers/pwm/rk_pwm.c
@@ -146,7 +146,7 @@ static int rk_pwm_probe(struct udevice *
  priv->data = (struct rockchip_pwm_data *)dev_get_driver_data(dev);
 
  if (priv->data->supports_polarity)
- priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE;
+ priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;
 
  return 0;
 }


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[patch v3 7/9] rockchip: video: vop: Fix format of fbbase in debug string

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
The debug string printing the device name, framebuffer address and of node
is using %lu as format for the framebuffer address, which is not so nice.
Change it to %lx.

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/drivers/video/rockchip/rk_vop.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_vop.c
+++ u-boot/drivers/video/rockchip/rk_vop.c
@@ -239,7 +239,7 @@ static int rk_display_init(struct udevic
  ofnode remote;
  const char *compat;
 
- debug("%s(%s, %lu, %s)\n", __func__,
+ debug("%s(%s, %lx, %s)\n", __func__,
       dev_read_name(dev), fbbase, ofnode_get_name(ep_node));
 
  ret = ofnode_read_u32(ep_node, "remote-endpoint", &remote_phandle);


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[patch v3 8/9] rockchip: video: edp: Add missing reset support

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
In order to ensure that the eDP registers are in correct state,
add missing support for the eDP reset lines found in the device-tree.


Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/drivers/video/rockchip/rk_edp.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_edp.c
+++ u-boot/drivers/video/rockchip/rk_edp.c
@@ -8,11 +8,13 @@
 #include <clk.h>
 #include <display.h>
 #include <dm.h>
+#include <dm/device_compat.h>
 #include <edid.h>
 #include <log.h>
 #include <malloc.h>
 #include <panel.h>
 #include <regmap.h>
+#include <reset.h>
 #include <syscon.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
@@ -1053,6 +1055,7 @@ static int rk_edp_probe(struct udevice *
  struct rk_edp_priv *priv = dev_get_priv(dev);
  struct rk3288_edp *regs = priv->regs;
  struct rockchip_dp_data *edp_data = (struct rockchip_dp_data *)dev_get_driver_data(dev);
+ struct reset_ctl dp_rst;
 
  struct clk clk;
  int ret;
@@ -1065,6 +1068,25 @@ static int rk_edp_probe(struct udevice *
  return ret;
  }
 
+ ret = reset_get_by_name(dev, "dp", &dp_rst);
+ if (ret) {
+ dev_err(dev, "failed to get dp reset (ret=%d)\n", ret);
+ return ret;
+ }
+
+ ret = reset_assert(&dp_rst);
+ if (ret) {
+ dev_err(dev, "failed to assert dp reset (ret=%d)\n", ret);
+ return ret;
+ }
+ udelay(20);
+
+ ret = reset_deassert(&dp_rst);
+ if (ret) {
+ dev_err(dev, "failed to deassert dp reset (ret=%d)\n", ret);
+ return ret;
+ }
+
  int vop_id = uc_plat->source_id;
  debug("%s, uc_plat=%p, vop_id=%u\n", __func__, uc_plat, vop_id);
 


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[patch v3 9/9] rockchip: videp: vop: Add reset support

Arnaud Patard (Rtp)
In reply to this post by Arnaud Patard (Rtp)
In order to ensure that the VOP registers are in correct state,
add missing support for the VOP reset lines found in the device-tree

Signed-off-by: Arnaud Patard <[hidden email]>
Index: u-boot/drivers/video/rockchip/rk_vop.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_vop.c
+++ u-boot/drivers/video/rockchip/rk_vop.c
@@ -8,9 +8,11 @@
 #include <clk.h>
 #include <display.h>
 #include <dm.h>
+#include <dm/device_compat.h>
 #include <edid.h>
 #include <log.h>
 #include <regmap.h>
+#include <reset.h>
 #include <syscon.h>
 #include <video.h>
 #include <asm/gpio.h>
@@ -36,14 +38,16 @@ enum vop_pol {
  DCLK_INVERT    = 3
 };
 
-static void rkvop_enable(struct rk3288_vop *regs, ulong fbbase,
+static void rkvop_enable(struct udevice *dev, struct rk3288_vop *regs, ulong fbbase,
  int fb_bits_per_pixel,
- const struct display_timing *edid)
+ const struct display_timing *edid,
+ struct reset_ctl *dclk_rst)
 {
  u32 lb_mode;
  u32 rgb_mode;
  u32 hactive = edid->hactive.typ;
  u32 vactive = edid->vactive.typ;
+ int ret;
 
  writel(V_ACT_WIDTH(hactive - 1) | V_ACT_HEIGHT(vactive - 1),
        &regs->win0_act_info);
@@ -91,6 +95,18 @@ static void rkvop_enable(struct rk3288_v
 
  writel(fbbase, &regs->win0_yrgb_mst);
  writel(0x01, &regs->reg_cfg_done); /* enable reg config */
+
+ ret = reset_assert(dclk_rst);
+ if (ret) {
+ dev_warn(dev, "failed to assert dclk reset (ret=%d)\n", ret);
+ return;
+ }
+ udelay(20);
+
+ ret = reset_deassert(dclk_rst);
+ if (ret)
+ dev_warn(dev, "failed to deassert dclk reset (ret=%d)\n", ret);
+
 }
 
 static void rkvop_set_pin_polarity(struct udevice *dev,
@@ -238,6 +254,7 @@ static int rk_display_init(struct udevic
  enum video_log2_bpp l2bpp;
  ofnode remote;
  const char *compat;
+ struct reset_ctl dclk_rst;
 
  debug("%s(%s, %lx, %s)\n", __func__,
       dev_read_name(dev), fbbase, ofnode_get_name(ep_node));
@@ -354,7 +371,14 @@ static int rk_display_init(struct udevic
  }
 
  rkvop_mode_set(dev, &timing, vop_id);
- rkvop_enable(regs, fbbase, 1 << l2bpp, &timing);
+
+ ret = reset_get_by_name(dev, "dclk", &dclk_rst);
+ if (ret) {
+ dev_err(dev, "failed to get dclk reset (ret=%d)\n", ret);
+ return ret;
+ }
+
+ rkvop_enable(dev, regs, fbbase, 1 << l2bpp, &timing, &dclk_rst);
 
  ret = display_enable(disp, 1 << l2bpp, &timing);
  if (ret)
@@ -391,11 +415,31 @@ int rk_vop_probe(struct udevice *dev)
  struct rk_vop_priv *priv = dev_get_priv(dev);
  int ret = 0;
  ofnode port, node;
+ struct reset_ctl ahb_rst;
 
  /* Before relocation we don't need to do anything */
  if (!(gd->flags & GD_FLG_RELOC))
  return 0;
 
+ ret = reset_get_by_name(dev, "ahb", &ahb_rst);
+ if (ret) {
+ dev_err(dev, "failed to get ahb reset (ret=%d)\n", ret);
+ return ret;
+ }
+
+ ret = reset_assert(&ahb_rst);
+ if (ret) {
+ dev_err(dev, "failed to assert ahb reset (ret=%d)\n", ret);
+ return ret;
+ }
+ udelay(20);
+
+ ret = reset_deassert(&ahb_rst);
+ if (ret) {
+ dev_err(dev, "failed to deassert ahb reset (ret=%d)\n", ret);
+ return ret;
+ }
+
  plat->base = gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - plat->size;
 
 #if defined(CONFIG_EFI_LOADER)