Re: [PATCH v3 2/2] drm/i915/gmbus: Enable burst read

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Apr 17, 2018 at 02:25:33PM +0530, Ramalingam C wrote:
> 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]
> 
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h  |  3 +++
>  drivers/gpu/drm/i915/i915_reg.h  |  1 +
>  drivers/gpu/drm/i915/intel_i2c.c | 22 ++++++++++++++++++++--
>  3 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 5373b171bb96..9cddcaa3efb2 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2548,6 +2548,9 @@ intel_info(const struct drm_i915_private *dev_priv)
>   */
>  #define HAS_AUX_IRQ(dev_priv)   true
>  #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))

Spec says "Not available until KBLPCH-H A0, SPT-LP D1, SPT-H E1"
Not quite sure if those two statements are equivalenet or not.

>  
>  /* 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 be6114a0e8ab..8b4e6363c7d2 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2984,6 +2984,7 @@ 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 4367827d7661..cb260f667cfa 100644
> --- a/drivers/gpu/drm/i915/intel_i2c.c
> +++ b/drivers/gpu/drm/i915/intel_i2c.c
> @@ -373,10 +373,21 @@ gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
>  		      unsigned short addr, u8 *buf, unsigned int len,
>  		      u32 gmbus1_index)
>  {
> +	unsigned int bytes_af_override = 0, size = len;

whatis af?

> +	bool burst_read = len > gmbus_max_xfer_size(dev_priv);
> +
> +	if (burst_read) {
> +		bytes_af_override = (len % 256) + 256;

The spec has a special case for 512 for some reason. Would be nice to
find out why it's there, and why there is no special case listed for
other larger multiples of 256.

No need for () around the %.

> +		size = bytes_af_override;

Why two variables for the same thing?

> +
> +		I915_WRITE_FW(GMBUS0, (I915_READ_FW(GMBUS0) |
> +			      GMBUS_BYTE_CNT_OVERRIDE));

useless parens

We could probably avoid the rmw by passing in the gmbus0
value from the caller.

> +	}
> +
>  	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) {
> @@ -392,6 +403,10 @@ gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
>  			*buf++ = val & 0xff;
>  			val >>= 8;
>  		} while (--len && ++loop < 4);
> +
> +		if (burst_read && len == (bytes_af_override - 4))

more useless parens

> +			I915_WRITE_FW(GMBUS0, (I915_READ_FW(GMBUS0) &
> +				      ~GMBUS_BYTE_CNT_OVERRIDE));

and some more

>  	}
>  
>  	return 0;
> @@ -407,7 +422,10 @@ 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 = rx_size;
> +		else
> +			len = min(rx_size, gmbus_max_xfer_size(dev_priv));
>  
>  		ret = gmbus_xfer_read_chunk(dev_priv, msg->addr,
>  					    buf, len, gmbus1_index);
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx