Patch set updated for coreboot: rockchip/rk3399: reset system if DDR init fails

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17045

-gerrit

commit b46f9e1858f7fb41e74aff28b2846b845fea2955
Author: Lin Huang 
Date:   Mon Oct 10 20:57:09 2016 -0700

rockchip/rk3399: reset system if DDR init fails

We found sdram may fail in pctl_cfg(), so we check the status in this
    function. If it exceeds 100ms still in this function, we will restart
    the system. We also found there are rare chances DDR training fails,
    so also restart system in that case.

BUG=chrome-os-partner:57988
    BRANCH=None
    TEST=coreboot resets on failure and eventually the system comes up

Change-Id: Icc0688da028a8f4f81eafe36bbaa79fdf2bcea74
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 89e45f8352f62e19a203316330aba14ccc5c8b11
    Original-Change-Id: If4e78983abcfdfe1e0e26847448d86169e598700
    Original-Signed-off-by: Lin Huang 
    Original-Reviewed-on: https://chromium-review.googlesource.com/397439
    Original-Reviewed-by: Julius Werner 
---
 src/mainboard/google/gru/Makefile.inc |  1 +
 src/soc/rockchip/rk3399/sdram.c       | 38 +++++++++++++++++++++++++----------
 2 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/src/mainboard/google/gru/Makefile.inc b/src/mainboard/google/gru/Makefile.inc
index 034edde..122139d 100644
--- a/src/mainboard/google/gru/Makefile.inc
+++ b/src/mainboard/google/gru/Makefile.inc
@@ -31,6 +31,7 @@ romstage-y += chromeos.c
 romstage-y += memlayout.ld
 romstage-y += pwm_regulator.c
 romstage-y += romstage.c
+romstage-y += reset.c
 romstage-y += sdram_configs.c

ramstage-y += boardid.c
diff --git a/src/soc/rockchip/rk3399/sdram.c b/src/soc/rockchip/rk3399/sdram.c
index ed13a82..ee98033 100644
--- a/src/soc/rockchip/rk3399/sdram.c
+++ b/src/soc/rockchip/rk3399/sdram.c
@@ -16,12 +16,14 @@
 #include <arch/io.h>
 #include <console/console.h>
 #include <delay.h>
+#include <reset.h>
 #include <soc/addressmap.h>
 #include <soc/clock.h>
 #include <soc/sdram.h>
 #include <soc/grf.h>
 #include <soc/soc.h>
 #include <string.h>
+#include <timer.h>
 #include <types.h>

#define DDR_PI_OFFSET			0x800
@@ -466,8 +468,8 @@ static void phy_io_config(u32 channel,
    clrsetbits_le32(&denali_phy[939], 0x3 << 17, speed << 17);
 }

-static void pctl_cfg(u32 channel,
-		     const struct rk3399_sdram_params *sdram_params)
+static int pctl_cfg(u32 channel,
+		    const struct rk3399_sdram_params *sdram_params)
 {
    u32 *denali_ctl = rk3399_ddr_pctl[channel]->denali_ctl;
    u32 *denali_pi = rk3399_ddr_pi[channel]->denali_pi;
@@ -476,6 +478,7 @@ static void pctl_cfg(u32 channel,
    const u32 *params_phy = sdram_params->phy_regs.denali_phy;
    u32 tmp, tmp1, tmp2;
    u32 pwrup_srefresh_exit;
+	struct stopwatch sw;

/*
     * work around controller bug:
@@ -554,14 +557,16 @@ static void pctl_cfg(u32 channel,
    /* PHY_DLL_RST_EN */
    clrsetbits_le32(&denali_phy[957], 0x3 << 24, 0x2 << 24);

-	/*
-	 * FIXME:
-	 * need to care ERROR bit
-	 */
-	while (!(read32(&denali_ctl[203]) & (1 << 3)))
-		;
+	/* FIXME: need to care ERROR bit */
+	stopwatch_init_msecs_expire(&sw, 100);
+	while (!(read32(&denali_ctl[203]) & (1 << 3))) {
+		if (stopwatch_expired(&sw))
+			return -1;
+	}
+
    clrsetbits_le32(&denali_ctl[68], PWRUP_SREFRESH_EXIT,
    		pwrup_srefresh_exit);
+	return 0;
 }

static void select_per_cs_training_index(u32 channel, u32 rank)
@@ -987,14 +992,25 @@ void sdram_init(const struct rk3399_sdram_params *sdram_params)
    	if (channel >= sdram_params->num_channels)
    		continue;

-		pctl_cfg(channel, sdram_params);
+		/*
+		 * TODO: we need to find the root cause why this
+		 * step may fail, before that, we just reset the
+		 * system, and start again.
+		 */
+		if (pctl_cfg(channel, sdram_params) != 0) {
+			printk(BIOS_ERR, "pctl_cfg fail, reset\n");
+			hard_reset();
+		}

/* LPDDR2/LPDDR3 need to wait DAI complete, max 10us */
    	if (dramtype == LPDDR3)
    		udelay(10);

-		if (data_training(channel, sdram_params, PI_FULL_TARINING))
-			die("SDRAM initialization failed!");
+		if (data_training(channel, sdram_params, PI_FULL_TARINING)) {
+			printk(BIOS_ERR,
+			       "SDRAM initialization failed, reset\n");
+			hard_reset();
+		}

set_ddrconfig(sdram_params, channel,
    		      sdram_params->ch[channel].ddrconfig);