Commit 6baa2e0c authored by Nathan Chancellor's avatar Nathan Chancellor Committed by Jani Nikula

drm/i915/display: Ensure that ret is always initialized in icl_combo_phy_verify_state

Clang warns:

drivers/gpu/drm/i915/display/intel_combo_phy.c:268:3: warning: variable
'ret' is uninitialized when used here [-Wuninitialized]
                ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN0(phy),
                ^~~
drivers/gpu/drm/i915/display/intel_combo_phy.c:261:10: note: initialize
the variable 'ret' to silence this warning
        bool ret;
                ^
                 = 0
1 warning generated.

In practice, the bug this warning appears to be concerned with would not
actually matter because ret gets initialized to the return value of
cnl_verify_procmon_ref_values. However, that does appear to be a bug
since it means the first hunk of the patch this fixes won't actually do
anything (since the values of check_phy_reg won't factor into the final
ret value). Initialize ret to true then make all of the assignments a
bitwise AND with itself so that the function always does what it should
do.

Fixes: 239bef67 ("drm/i915/display: Implement new combo phy initialization step")
Link: https://github.com/ClangBuiltLinux/linux/issues/1094Signed-off-by: default avatarNathan Chancellor <natechancellor@gmail.com>
Reviewed-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200828202830.7165-1-jose.souza@intel.comSigned-off-by: default avatarJosé Roberto de Souza <jose.souza@intel.com>
(cherry picked from commit 2034c212)
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
parent f75aef39
...@@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy) ...@@ -258,7 +258,7 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv, static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
enum phy phy) enum phy phy)
{ {
bool ret; bool ret = true;
u32 expected_val = 0; u32 expected_val = 0;
if (!icl_combo_phy_enabled(dev_priv, phy)) if (!icl_combo_phy_enabled(dev_priv, phy))
...@@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv, ...@@ -276,7 +276,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
DCC_MODE_SELECT_CONTINUOSLY); DCC_MODE_SELECT_CONTINUOSLY);
} }
ret = cnl_verify_procmon_ref_values(dev_priv, phy); ret &= cnl_verify_procmon_ref_values(dev_priv, phy);
if (phy_is_master(dev_priv, phy)) { if (phy_is_master(dev_priv, phy)) {
ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy), ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
......
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