diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2025-08-28 15:20:53 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2025-09-04 14:02:58 +0300 |
| commit | e38e3c50a14c76bf130a688bffd130797b09dfe6 (patch) | |
| tree | 84eace2f6f9ff1f11b27a861e35ca2507fbf1bb3 | |
| parent | a8eb4cdcedd836b22459b9f6e68b60001bd04bac (diff) | |
drm/i915/power-well: use generic poll_timeout_us() instead of wait_for() for VLV/CHV
Prefer generic poll helpers over i915 custom helpers.
The functional change is losing the exponentially growing sleep of
wait_for(), which used to be 10, 20, 40, ..., 640, and 1280 us.
Use an arbitrary constant 500 us sleep instead. The timeout remains at
100 ms.
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://lore.kernel.org/r/c644b7b5611a3c047ea5d3d52acd91830b2fa6b4.1756383233.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display_power_well.c | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c index c7a1fcb9d6ad..5e88b930f5aa 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power_well.c +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c @@ -8,7 +8,6 @@ #include "i915_drv.h" #include "i915_irq.h" #include "i915_reg.h" -#include "i915_utils.h" #include "intel_backlight_regs.h" #include "intel_combo_phy.h" #include "intel_combo_phy_regs.h" @@ -1127,6 +1126,8 @@ static void vlv_set_power_well(struct intel_display *display, u32 mask; u32 state; u32 ctrl; + u32 val; + int ret; mask = PUNIT_PWRGT_MASK(pw_idx); state = enable ? PUNIT_PWRGT_PWR_ON(pw_idx) : @@ -1134,10 +1135,8 @@ static void vlv_set_power_well(struct intel_display *display, vlv_punit_get(display->drm); -#define COND \ - ((vlv_punit_read(display->drm, PUNIT_REG_PWRGT_STATUS) & mask) == state) - - if (COND) + val = vlv_punit_read(display->drm, PUNIT_REG_PWRGT_STATUS); + if ((val & mask) == state) goto out; ctrl = vlv_punit_read(display->drm, PUNIT_REG_PWRGT_CTRL); @@ -1145,14 +1144,15 @@ static void vlv_set_power_well(struct intel_display *display, ctrl |= state; vlv_punit_write(display->drm, PUNIT_REG_PWRGT_CTRL, ctrl); - if (wait_for(COND, 100)) + ret = poll_timeout_us(val = vlv_punit_read(display->drm, PUNIT_REG_PWRGT_STATUS), + (val & mask) == state, + 500, 100 * 1000, false); + if (ret) drm_err(display->drm, "timeout setting power well state %08x (%08x)\n", state, vlv_punit_read(display->drm, PUNIT_REG_PWRGT_CTRL)); -#undef COND - out: vlv_punit_put(display->drm); } @@ -1716,23 +1716,24 @@ static void chv_set_pipe_power_well(struct intel_display *display, enum pipe pipe = PIPE_A; u32 state; u32 ctrl; + int ret; state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe); vlv_punit_get(display->drm); -#define COND \ - ((vlv_punit_read(display->drm, PUNIT_REG_DSPSSPM) & DP_SSS_MASK(pipe)) == state) - - if (COND) + ctrl = vlv_punit_read(display->drm, PUNIT_REG_DSPSSPM); + if ((ctrl & DP_SSS_MASK(pipe)) == state) goto out; - ctrl = vlv_punit_read(display->drm, PUNIT_REG_DSPSSPM); ctrl &= ~DP_SSC_MASK(pipe); ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe); vlv_punit_write(display->drm, PUNIT_REG_DSPSSPM, ctrl); - if (wait_for(COND, 100)) + ret = poll_timeout_us(ctrl = vlv_punit_read(display->drm, PUNIT_REG_DSPSSPM), + (ctrl & DP_SSS_MASK(pipe)) == state, + 500, 100 * 1000, false); + if (ret) drm_err(display->drm, "timeout setting power well state %08x (%08x)\n", state, |