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drm/i915/dsb: Check DSB engine status.

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As per bspec check for DSB status before programming any
of its register. Inline function added to check the dsb status.

Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190920115930.27829-6-animesh.manna@intel.com
This commit is contained in:
Animesh Manna 2019-09-20 17:29:25 +05:30 committed by Jani Nikula
parent b27a96ad72
commit a6e58d9a2e
2 changed files with 16 additions and 0 deletions
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9
drivers/gpu/drm/i915/display/intel_dsb.c
View File

@ -17,6 +17,15 @@
#define DSB_BYTE_EN_SHIFT 20
#define DSB_REG_VALUE_MASK 0xfffff
static inline bool is_dsb_busy(struct intel_dsb *dsb)
{
struct intel_crtc *crtc = container_of(dsb, typeof(*crtc), dsb);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
enum pipe pipe = crtc->pipe;
return DSB_STATUS & I915_READ(DSB_CTRL(pipe, dsb->id));
}
struct intel_dsb *
intel_dsb_get(struct intel_crtc *crtc)
{

7
drivers/gpu/drm/i915/i915_reg.h
View File

@ -11698,4 +11698,11 @@ enum skl_power_gate {
#define PORT_TX_DFLEXDPCSSS(fia) _MMIO_FIA((fia), 0x00894)
#define DP_PHY_MODE_STATUS_NOT_SAFE(tc_port) (1 << (tc_port))
/* This register controls the Display State Buffer (DSB) engines. */
#define _DSBSL_INSTANCE_BASE 0x70B00
#define DSBSL_INSTANCE(pipe, id) (_DSBSL_INSTANCE_BASE + \
(pipe) * 0x1000 + (id) * 100)
#define DSB_CTRL(pipe, id) _MMIO(DSBSL_INSTANCE(pipe, id) + 0x8)
#define DSB_STATUS (1 << 0)
#endif /* _I915_REG_H_ */