leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915: protect macro parameters in SWING_SEL_{UPP,LO}WER

Browse Source 
Protect the macro parameters with parens in order to avoid priority
issues on macro evaluation when the macro argument is not a single
operand.

This is not a problem today, but it could be in the future. I found
this while reviewing a patch that introduces new callers for the
macros.

v2: Rebase.

Reference: commit 04416108cc ("drm/i915/cnl: Add registers related to voltage swing sequences.")
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180323195853.4599-1-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2018-03-23 12:58:53 -07:00
parent 323301af97
commit 7487508eff
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/i915_reg.h
View File

@ -1749,9 +1749,9 @@ enum i915_power_well_id {
#define ICL_PORT_TX_DW2_LN0(port) _MMIO_PORT(port, \
_ICL_PORT_TX_DW2_LN0_A, \
_ICL_PORT_TX_DW2_LN0_B)
#define SWING_SEL_UPPER(x) ((x >> 3) << 15)
#define SWING_SEL_UPPER(x) (((x) >> 3) << 15)
#define SWING_SEL_UPPER_MASK (1 << 15)
#define SWING_SEL_LOWER(x) ((x & 0x7) << 11)
#define SWING_SEL_LOWER(x) (((x) & 0x7) << 11)
#define SWING_SEL_LOWER_MASK (0x7 << 11)
#define RCOMP_SCALAR(x) ((x) << 0)
#define RCOMP_SCALAR_MASK (0xFF << 0)