mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 21:57:43 +00:00
Code Issues Releases Wiki Activity

drm/i915: Remove I915_READ64 and I915_READ64_32x2

Browse source 
Now that all their users are gone we can remove the macros and
accompanying duplicated comment.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190610120608.15477-6-tvrtko.ursulin@linux.intel.com
This commit is contained in:
Tvrtko Ursulin 2019-06-10 13:06:08 +01:00
parent 1cea02dbca
commit 6caed5c938
1 changed files with 0 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
drivers/gpu/drm/i915/i915_drv.h
View file

@ -2851,24 +2851,6 @@ extern void intel_display_print_error_state(struct drm_i915_error_state_buf *e,
#define I915_READ_NOTRACE(reg__) __I915_REG_OP(read_notrace, dev_priv, (reg__))
#define I915_WRITE_NOTRACE(reg__, val__) __I915_REG_OP(write_notrace, dev_priv, (reg__), (val__))
/* Be very careful with read/write 64-bit values. On 32-bit machines, they
* will be implemented using 2 32-bit writes in an arbitrary order with
* an arbitrary delay between them. This can cause the hardware to
* act upon the intermediate value, possibly leading to corruption and
* machine death. For this reason we do not support I915_WRITE64, or
* dev_priv->uncore.funcs.mmio_writeq.
*
* When reading a 64-bit value as two 32-bit values, the delay may cause
* the two reads to mismatch, e.g. a timestamp overflowing. Also note that
* occasionally a 64-bit register does not actualy support a full readq
* and must be read using two 32-bit reads.
*
* You have been warned.
*/
#define I915_READ64(reg__) __I915_REG_OP(read64, dev_priv, (reg__))
#define I915_READ64_2x32(lower_reg__, upper_reg__) \
__I915_REG_OP(read64_2x32, dev_priv, (lower_reg__), (upper_reg__))
#define POSTING_READ(reg__) __I915_REG_OP(posting_read, dev_priv, (reg__))
#define POSTING_READ16(reg__) __I915_REG_OP(posting_read16, dev_priv, (reg__))