[coreboot-gerrit] New patch to review for coreboot: 31c7d88 tegra: i2c: re-init i2c controller after reset

[Marc Jones (marc.jones@se-eng.com)]

Marc Jones (marc.jones at se-eng.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8145

-gerrit

commit 31c7d8880b047629abd6c41e3368ea3cc0223e19
Author: Jimmy Zhang <jimmzhang at nvidia.com>
Date:   Thu Jun 5 15:20:56 2014 -0700

    tegra: i2c: re-init i2c controller after reset
    
    This serves as supplemental patch to CL:197732. After clearing bus, we
    should also redo controller init (because controller has been reset
    before bus clear). On the upper layer, upon receiving error return status,
    it should just retry instead of simply call cpu_reset().
    
    BUG=chrome-os-partner:28323
    BRANCH=nyan
    TEST=Built and tested on nyan and nyan_big.
    
    Original-Change-Id: Ib526bc730cb73ffef8696fc2a6a2769d6e71eb9e
    Original-Signed-off-by: Jimmy Zhang <jimmzhang at nvidia.com>
    Original-Reviewed-on: https://chromium-review.googlesource.com/202784
    Original-Reviewed-by: Julius Werner <jwerner at chromium.org>
    (cherry picked from commit 06f8917c70ddca88c847d0f15ebe7f286a3f6338)
    Signed-off-by: Marc Jones <marc.jones at se-eng.com>
    
    Change-Id: I1d8bc43d730b53fe7f2dad8713831311e96e3984
---
 src/soc/nvidia/tegra/i2c.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/soc/nvidia/tegra/i2c.c b/src/soc/nvidia/tegra/i2c.c
index 26c2559..542d4f0 100644
--- a/src/soc/nvidia/tegra/i2c.c
+++ b/src/soc/nvidia/tegra/i2c.c
@@ -112,12 +112,14 @@ static int tegra_i2c_send_recv(int bus, int read,
 			       "%s: The address was not acknowledged.\n",
 			       __func__);
 			info->reset_func(info->reset_bit);
+			i2c_init(bus);
 			return -1;
 		} else if (transfer_status & I2C_PKT_STATUS_NOACK_DATA) {
 			printk(BIOS_ERR,
 			       "%s: The data was not acknowledged.\n",
 			       __func__);
 			info->reset_func(info->reset_bit);
+			i2c_init(bus);
 			return -1;
 		} else if (transfer_status & I2C_PKT_STATUS_ARB_LOST) {
 			printk(BIOS_ERR,
@@ -128,6 +130,9 @@ static int tegra_i2c_send_recv(int bus, int read,
 			/* Use Tegra bus clear registers to unlock SDA */
 			do_bus_clear(bus);
 
+			/* re-init i2c controller */
+			i2c_init(bus);
+
 			/* Return w/error, let caller decide what to do */
 			return -1;
 		}