On 5/16/2014 5:43 AM, Rodrigo Vivi wrote:
Now we have the active/inactive state for exit and this actually changes the HW enable bit the status was a bit confusing for users. So let's provide more info.Signed-off-by: Rodrigo Vivi <rodrigo.v...@gmail.com> --- drivers/gpu/drm/i915/i915_debugfs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 6636ca2..0ca9376 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1975,10 +1975,12 @@ static int i915_edp_psr_status(struct seq_file *m, void *data) seq_printf(m, "Sink_Support: %s\n", yesno(dev_priv->psr.sink_support)); seq_printf(m, "Source_OK: %s\n", yesno(dev_priv->psr.source_ok)); + seq_printf(m, "Enabled: %s\n", yesno(dev_priv->psr.enabled)); + seq_printf(m, "Active: %s\n", yesno(dev_priv->psr.active)); enabled = HAS_PSR(dev) && I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE; - seq_printf(m, "Enabled: %s\n", yesno(enabled)); + seq_printf(m, "HW Enabled & Active bit: %s\n", yesno(enabled)); if (HAS_PSR(dev)) psrperf = I915_READ(EDP_PSR_PERF_CNT(dev)) &
Please remove all references to PSR performance counter. This register is primarily meant as a debug register and its implementation is broken in the h/w. Whenever the cdclk is gated to save power, the performance counter is stopped. But when the clk is re-enabled it doesn't reset the counter. This unnecessarily confuses the end users.. When the system goes through suspend / resume cycle the performance counter most likely will transition from a non-zero value to zero.. I already received few queries from our customers related to this performance customer and they refuse to believe me when i tell them PSR is still functional when the performance counter reports 0 :-)
AFAIK this register definition is missing in open source HSW B spec as well..
Thanks, Vijay
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