On Thu, Aug 01, 2019 at 04:28:12PM -0700, Jose Souza wrote:
On TGL this register do not map directly to port, it was already
handled when setting it(TGL_TRANS_DDI_SELECT_PORT()) but not when
reading it.
Cc: Lucas De Marchi <lucas.demar...@intel.com>
Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c
b/drivers/gpu/drm/i915/display/intel_display.c
index 9e4ee29fd0fc..b9526aa402f9 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -10353,11 +10353,17 @@ static void haswell_get_ddi_port_state(struct
intel_crtc *crtc,
tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe_config->cpu_transcoder));
- if (INTEL_GEN(dev_priv) >= 12)
+ if (INTEL_GEN(dev_priv) >= 12) {
port = (tmp & TGL_TRANS_DDI_PORT_MASK) >>
TGL_TRANS_DDI_PORT_SHIFT;
- else
+ /*
+ * Register values: none = 0, DDIA = 1... while PORT_A = 0...
+ * so subtract one
+ */
+ port--;
port = TGL_PORT_TRANS_DDI_SELECT(tmp)
and put the macro right below the TGL_TRANS_DDI_SELECT_PORT() so the
intent is explicit and we don't forget again. Then you can remove the
comment.
any chance of tmp being none and the -1 underflow?
Lucas De Marchi
+ } else {
port = (tmp & TRANS_DDI_PORT_MASK) >> TRANS_DDI_PORT_SHIFT;
+ }
if (INTEL_GEN(dev_priv) >= 11)
icelake_get_ddi_pll(dev_priv, port, pipe_config);
--
2.22.0
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