>From BXT onwards Bspec says HW supports Max Bytes per single RD/WR op is
511Bytes instead of previous 256Bytes used in SW.
This change allows the max bytes per op upto 511Bytes from BXT onwards.
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_i2c.c | 10 ++++++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 475cac07d3e6..4f583da0cee9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3013,6 +3013,7 @@ enum i915_power_well_id {
#define GMBUS_CYCLE_STOP (4<<25)
#define GMBUS_BYTE_COUNT_SHIFT 16
#define GMBUS_BYTE_COUNT_MAX 256U
+#define BXT_GMBUS_BYTE_COUNT_MAX 511U
#define GMBUS_SLAVE_INDEX_SHIFT 8
#define GMBUS_SLAVE_ADDR_SHIFT 1
#define GMBUS_SLAVE_READ (1<<0)
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index e6875509bcd9..7e92c7934657 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -400,7 +400,10 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
int ret;
do {
- len = min(rx_size, GMBUS_BYTE_COUNT_MAX);
+ if (INTEL_GEN(dev_priv) >= 9)
+ len = min(rx_size, BXT_GMBUS_BYTE_COUNT_MAX);
+ else
+ len = min(rx_size, GMBUS_BYTE_COUNT_MAX);
ret = gmbus_xfer_read_chunk(dev_priv, msg->addr,
buf, len, gmbus1_index);
@@ -462,7 +465,10 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
int ret;
do {
- len = min(tx_size, GMBUS_BYTE_COUNT_MAX);
+ if (INTEL_GEN(dev_priv) >= 9)
+ len = min(tx_size, BXT_GMBUS_BYTE_COUNT_MAX);
+ else
+ len = min(tx_size, GMBUS_BYTE_COUNT_MAX);
ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len,
gmbus1_index);
--
2.7.4
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