[RFC PATCH 4/6] drm/i915: Add function to output Aksv over GMBUS

Sean Paul
2017-11-30T03:10:11Z

Once the Aksv is available in the PCH, we need to get it on the wire to
the receiver via DDC. The hardware doesn't allow us to read the value
directly, so we need to tell GMBUS to source the Aksv internally and
send it to the right offset on the receiver.

The way we do this is to initiate an indexed write where the index is
the Aksv register offset. We write dummy values to GMBUS3 as if we were
sending the key, and the hardware slips in the "real" values when it
goes out.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_i2c.c | 54 ++++++++++++++++++++++++++++++++++------
3 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 54b5d4c582b6..30fcd856ec23 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -4024,6 +4024,7 @@ extern int intel_setup_gmbus(struct drm_i915_private *dev_priv);
extern void intel_teardown_gmbus(struct drm_i915_private *dev_priv);
extern bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
unsigned int pin);
+extern int intel_gmbus_output_aksv(struct i2c_adapter *adapter);

extern struct i2c_adapter *
intel_gmbus_get_adapter(struct drm_i915_private *dev_priv, unsigned int pin);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 43128030171d..78370877fea3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3009,6 +3009,7 @@ enum i915_power_well_id {
# define GPIO_DATA_PULLUP_DISABLE (1 << 13)

#define GMBUS0 _MMIO(dev_priv->gpio_mmio_base + 0x5100) /* clock/port select */
+#define GMBUS_AKSV_SELECT (1<<11)
#define GMBUS_RATE_100KHZ (0<<8)
#define GMBUS_RATE_50KHZ (1<<8)
#define GMBUS_RATE_400KHZ (2<<8) /* reserved on Pineview */
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index eb5827110d8f..c01156bf0f27 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -30,6 +30,7 @@
#include <linux/i2c-algo-bit.h>
#include <linux/export.h>
#include <drm/drmP.h>
+#include <drm/drm_hdcp.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
@@ -373,7 +374,8 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,

static int
gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
- unsigned short addr, u8 *buf, unsigned int len)
+ unsigned short addr, u8 *buf, unsigned int len,
+ u32 gmbus1_index)
{
unsigned int chunk_size = len;
u32 val, loop;
@@ -386,7 +388,7 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,

I915_WRITE_FW(GMBUS3, val);
I915_WRITE_FW(GMBUS1,
- GMBUS_CYCLE_WAIT |
+ gmbus1_index | GMBUS_CYCLE_WAIT |
(chunk_size << GMBUS_BYTE_COUNT_SHIFT) |
(addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
@@ -409,7 +411,8 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
}

static int
-gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
+gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
+ u32 gmbus1_index)
{
u8 *buf = msg->buf;
unsigned int tx_size = msg->len;
@@ -419,7 +422,8 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
do {
len = min(tx_size, GMBUS_BYTE_COUNT_MAX);

- ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len);
+ ret = gmbus_xfer_write_chunk(dev_priv, msg->addr, buf, len,
+ gmbus1_index);
if (ret)
return ret;

@@ -470,7 +474,8 @@ gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
}

static int
-do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
+do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num,
+ u32 gmbus0_source, u32 gmbus1_index)
{
struct intel_gmbus *bus = container_of(adapter,
struct intel_gmbus,
@@ -480,7 +485,7 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
int ret = 0;

retry:
- I915_WRITE_FW(GMBUS0, bus->reg0);
+ I915_WRITE_FW(GMBUS0, gmbus0_source | bus->reg0);

for (; i < num; i += inc) {
inc = 1;
@@ -490,7 +495,8 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
} else if (msgs[i].flags & I2C_M_RD) {
ret = gmbus_xfer_read(dev_priv, &msgs[i], 0);
} else {
- ret = gmbus_xfer_write(dev_priv, &msgs[i]);
+ ret = gmbus_xfer_write(dev_priv, &msgs[i],
+ gmbus1_index);
}

if (!ret)
@@ -598,7 +604,7 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
if (ret < 0)
bus->force_bit &= ~GMBUS_FORCE_BIT_RETRY;
} else {
- ret = do_gmbus_xfer(adapter, msgs, num);
+ ret = do_gmbus_xfer(adapter, msgs, num, 0, 0);
if (ret == -EAGAIN)
bus->force_bit |= GMBUS_FORCE_BIT_RETRY;
}
@@ -608,6 +614,38 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
return ret;
}

+int intel_gmbus_output_aksv(struct i2c_adapter *adapter)
+{
+ struct intel_gmbus *bus = container_of(adapter, struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ int ret;
+ u8 buf[DRM_HDCP_KSV_LEN] = { 0 };
+ struct i2c_msg msg = {
+ .addr = DRM_HDCP_DDC_ADDR,
+ .flags = 0,
+ .len = sizeof(buf),
+ .buf = buf,
+ };
+
+ intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
+ mutex_lock(&dev_priv->gmbus_mutex);
+
+ /*
+ * In order to output Aksv to the receiver, use an indexed write to
+ * pass the i2c command, and tell GMBUS to use the HW-provided value
+ * instead of sourcing GMBUS3 for the data.
+ */
+ ret = do_gmbus_xfer(adapter, &msg, 1, GMBUS_AKSV_SELECT,
+ GMBUS_CYCLE_INDEX |
+ (DRM_HDCP_DDC_AKSV << GMBUS_SLAVE_INDEX_SHIFT));
+
+ mutex_unlock(&dev_priv->gmbus_mutex);
+ intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
+
+ return ret;
+}
+
static u32 gmbus_func(struct i2c_adapter *adapter)
{
return i2c_bit_algo.functionality(adapter) &
--
2.15.0.531.g2ccb3012c9-goog