drm/i915/gmbus: Enable burst read

Support for Burst read in HW is added for HDCP2.2 compliance
requirement.

This patch enables the burst read for all the gmbus read of more than
511Bytes, on capable platforms.

v2:
  Extra line is removed.
v3:
  Macro is added for detecting the BURST_READ Support [Jani]
  Runtime detection of the need for burst_read [Jani]
  Calculation enhancement.
v4:
  GMBUS0 reg val is passed from caller [ville]
  Removed a extra var [ville]
  Extra brackets are removed [ville]
  Implemented the handling of 512Bytes Burst Read.
v5:
  Burst read max length is fixed at 767Bytes [Ville]
v6:
  Collecting the received reviewed-by.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1530192889-5789-3-git-send-email-ramalingam.c@intel.com

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 48b350116cbaef7573ad7810a160ae0855076a6d..a6c6decd05465a51daa04c027ba87f5a4065889e 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2560,6 +2560,9 @@ intel_info(const struct drm_i915_private *dev_priv)
         IS_SKL_GT3(dev_priv) || IS_SKL_GT4(dev_priv))
 
 #define HAS_GMBUS_IRQ(dev_priv) (INTEL_GEN(dev_priv) >= 4)
+#define HAS_GMBUS_BURST_READ(dev_priv) (INTEL_GEN(dev_priv) >= 10 || \
+                                       IS_GEMINILAKE(dev_priv) || \
+                                       IS_KABYLAKE(dev_priv))
 
 /* With the 945 and later, Y tiling got adjusted so that it was 32 128-byte
  * rows, which changed the alignment requirements and fence programming.

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2da870a8948e7bc72150b052e265efb480f13725..1f222af0324dae43d39601552827fc2e9268dba4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3123,6 +3123,7 @@ enum i915_power_well_id {
 #define   GMBUS_RATE_400KHZ    (2 << 8) /* reserved on Pineview */
 #define   GMBUS_RATE_1MHZ      (3 << 8) /* reserved on Pineview */
 #define   GMBUS_HOLD_EXT       (1 << 7) /* 300ns hold time, rsvd on Pineview */
+#define   GMBUS_BYTE_CNT_OVERRIDE (1 << 6)
 #define   GMBUS_PIN_DISABLED   0
 #define   GMBUS_PIN_SSC                1
 #define   GMBUS_PIN_VGADDC     2

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 82bb9c33ab1cfdf0c9f560f677fc7380ca10f3d9..bef32b7c248e0bdbe42eec64f36e0e3c64e5e5a7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -371,12 +371,29 @@ unsigned int gmbus_max_xfer_size(struct drm_i915_private *dev_priv)
 static int
 gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
                      unsigned short addr, u8 *buf, unsigned int len,
-                     u32 gmbus1_index)
+                     u32 gmbus0_reg, u32 gmbus1_index)
 {
+       unsigned int size = len;
+       bool burst_read = len > gmbus_max_xfer_size(dev_priv);
+       bool extra_byte_added = false;
+
+       if (burst_read) {
+               /*
+                * As per HW Spec, for 512Bytes need to read extra Byte and
+                * Ignore the extra byte read.
+                */
+               if (len == 512) {
+                       extra_byte_added = true;
+                       len++;
+               }
+               size = len % 256 + 256;
+               I915_WRITE_FW(GMBUS0, gmbus0_reg | GMBUS_BYTE_CNT_OVERRIDE);
+       }
+
        I915_WRITE_FW(GMBUS1,
                      gmbus1_index |
                      GMBUS_CYCLE_WAIT |
-                     (len << GMBUS_BYTE_COUNT_SHIFT) |
+                     (size << GMBUS_BYTE_COUNT_SHIFT) |
                      (addr << GMBUS_SLAVE_ADDR_SHIFT) |
                      GMBUS_SLAVE_READ | GMBUS_SW_RDY);
        while (len) {
@@ -389,17 +406,34 @@ gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
 
                val = I915_READ_FW(GMBUS3);
                do {
+                       if (extra_byte_added && len == 1)
+                               break;
+
                        *buf++ = val & 0xff;
                        val >>= 8;
                } while (--len && ++loop < 4);
+
+               if (burst_read && len == size - 4)
+                       /* Reset the override bit */
+                       I915_WRITE_FW(GMBUS0, gmbus0_reg);
        }
 
        return 0;
 }
 
+/*
+ * HW spec says that 512Bytes in Burst read need special treatment.
+ * But it doesn't talk about other multiple of 256Bytes. And couldn't locate
+ * an I2C slave, which supports such a lengthy burst read too for experiments.
+ *
+ * So until things get clarified on HW support, to avoid the burst read length
+ * in fold of 256Bytes except 512, max burst read length is fixed at 767Bytes.
+ */
+#define INTEL_GMBUS_BURST_READ_MAX_LEN         767U
+
 static int
 gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
-               u32 gmbus1_index)
+               u32 gmbus0_reg, u32 gmbus1_index)
 {
        u8 *buf = msg->buf;
        unsigned int rx_size = msg->len;
@@ -407,10 +441,13 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
        int ret;
 
        do {
-               len = min(rx_size, gmbus_max_xfer_size(dev_priv));
+               if (HAS_GMBUS_BURST_READ(dev_priv))
+                       len = min(rx_size, INTEL_GMBUS_BURST_READ_MAX_LEN);
+               else
+                       len = min(rx_size, gmbus_max_xfer_size(dev_priv));
 
-               ret = gmbus_xfer_read_chunk(dev_priv, msg->addr,
-                                           buf, len, gmbus1_index);
+               ret = gmbus_xfer_read_chunk(dev_priv, msg->addr, buf, len,
+                                           gmbus0_reg, gmbus1_index);
                if (ret)
                        return ret;
 
@@ -498,7 +535,8 @@ gmbus_is_index_xfer(struct i2c_msg *msgs, int i, int num)
 }
 
 static int
-gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
+gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs,
+                u32 gmbus0_reg)
 {
        u32 gmbus1_index = 0;
        u32 gmbus5 = 0;
@@ -516,7 +554,8 @@ gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
                I915_WRITE_FW(GMBUS5, gmbus5);
 
        if (msgs[1].flags & I2C_M_RD)
-               ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
+               ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus0_reg,
+                                     gmbus1_index);
        else
                ret = gmbus_xfer_write(dev_priv, &msgs[1], gmbus1_index);
 
@@ -551,10 +590,12 @@ retry:
        for (; i < num; i += inc) {
                inc = 1;
                if (gmbus_is_index_xfer(msgs, i, num)) {
-                       ret = gmbus_index_xfer(dev_priv, &msgs[i]);
+                       ret = gmbus_index_xfer(dev_priv, &msgs[i],
+                                              gmbus0_source | bus->reg0);
                        inc = 2; /* an index transmission is two msgs */
                } else if (msgs[i].flags & I2C_M_RD) {
-                       ret = gmbus_xfer_read(dev_priv, &msgs[i], 0);
+                       ret = gmbus_xfer_read(dev_priv, &msgs[i],
+                                             gmbus0_source | bus->reg0, 0);
                } else {
                        ret = gmbus_xfer_write(dev_priv, &msgs[i], 0);
                }