On Thu, Feb 10, 2022 at 01:05:01PM +0800, Chuansheng Liu wrote:
> Current DMC_DEBUG3(_MMIO(0x101090)) address is for TGL,
> it is not wrong for DG1. Just like commit 5bcc95ca382e
> ("drm/i915/dg1: Update DMC_DEBUG register"), correct
> this issue for DG1 platform to avoid wrong register
> being read.
>
> BSpec: 49788
>
> Signed-off-by: Chuansheng Liu <chuansheng....@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_display_debugfs.c | 4 ++--
> drivers/gpu/drm/i915/i915_reg.h | 3 ++-
> 2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index f4de004d470f..f6c4ad8fce19 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -474,8 +474,8 @@ static int i915_dmc_info(struct seq_file *m, void *unused)
> * reg for DC3CO debugging and validation,
> * but TGL DMC f/w is using DMC_DEBUG3 reg for DC3CO counter.
> */
> - seq_printf(m, "DC3CO count: %d\n",
> - intel_de_read(dev_priv, DMC_DEBUG3));
> + seq_printf(m, "DC3CO count: %d\n", intel_de_read(dev_priv,
> IS_DGFX(dev_priv) ?
> + DG1_DMC_DEBUG3 : TGL_DMC_DEBUG3));
It looks like some future igpu platforms will likely also use this new
register offset, but those are a bit down the road; we can cross that
bridge when we get to it. This change looks correct for now.
Reviewed-by: Matt Roper <matthew.d.ro...@intel.com>
> } else {
> dc5_reg = IS_BROXTON(dev_priv) ? BXT_DMC_DC3_DC5_COUNT :
> SKL_DMC_DC3_DC5_COUNT;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 87c92314ee26..9c215a6df659 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5632,7 +5632,8 @@
> #define TGL_DMC_DEBUG_DC6_COUNT _MMIO(0x101088)
> #define DG1_DMC_DEBUG_DC5_COUNT _MMIO(0x134154)
>
> -#define DMC_DEBUG3 _MMIO(0x101090)
> +#define TGL_DMC_DEBUG3 _MMIO(0x101090)
> +#define DG1_DMC_DEBUG3 _MMIO(0x13415c)
>
> /* Display Internal Timeout Register */
> #define RM_TIMEOUT _MMIO(0x42060)
> --
> 2.25.0.rc2
>
--
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
