[Intel-gfx] [PATCH 6/8] drm/i915/fbc: Align FBC segments to 512B on glk+

Ville Syrjala
2021-07-02T20:46:26Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Apply the same 512 byte FBC segment alignment to glk+ as we use
on skl+. The only real difference is that we now have a dedicated
register for the FBC override stride. Not 100% sure which
platforms really need the 512B alignment, but it's easieest
to just do it on everything.

Also the hardware no longer seems to misclaculate the CFB stride
for linear, so we can omit the use of the override stride for
linear unless the stride is misaligned.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 14 +++++++++++---
drivers/gpu/drm/i915/i915_reg.h | 4 ++++
2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 2baf58af016c..2da5295092e7 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -93,7 +93,7 @@ static unsigned int intel_fbc_cfb_stride(struct drm_i915_private *i915,
* be 512 byte aligned. Aligning each line to 512 bytes guarantees
* that regardless of the compression limit we choose later.
*/
- if (DISPLAY_VER(i915) == 9)
+ if (DISPLAY_VER(i915) >= 9)
return ALIGN(stride, 512);
else
return stride;
@@ -334,10 +334,18 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
const struct intel_fbc_reg_params *params = &fbc->params;
u32 dpfc_ctl;

- /* Display WA #0529: skl, kbl, bxt. */
- if (DISPLAY_VER(dev_priv) == 9) {
+ if (DISPLAY_VER(dev_priv) >= 10) {
u32 val = 0;

+ if (params->override_cfb_stride)
+ val |= FBC_STRIDE_OVERRIDE |
+ FBC_STRIDE(params->override_cfb_stride / fbc->limit);
+
+ intel_de_write(dev_priv, GLK_FBC_STRIDE, val);
+ } else if (DISPLAY_VER(dev_priv) == 9) {
+ u32 val = 0;
+
+ /* Display WA #0529: skl, kbl, bxt. */
if (params->override_cfb_stride)
val |= CHICKEN_FBC_STRIDE_OVERRIDE |
CHICKEN_FBC_STRIDE(params->override_cfb_stride / fbc->limit);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ab2bd4837efd..7cf318d84d81 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3334,6 +3334,10 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define ILK_DPFC_DISABLE_DUMMY0 (1 << 8)
#define ILK_DPFC_CHICKEN_COMP_DUMMY_PIXEL (1 << 14)
#define ILK_DPFC_NUKE_ON_ANY_MODIFICATION (1 << 23)
+#define GLK_FBC_STRIDE _MMIO(0x43228)
+#define FBC_STRIDE_OVERRIDE REG_BIT(15)
+#define FBC_STRIDE_MASK REG_GENMASK(14, 0)
+#define FBC_STRIDE(x) REG_FIELD_PREP(FBC_STRIDE_MASK, (x))
#define ILK_FBC_RT_BASE _MMIO(0x2128)
#define ILK_FBC_RT_VALID (1 << 0)
#define SNB_FBC_FRONT_BUFFER (1 << 1)
--
2.31.1