diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2025-08-28 15:20:49 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2025-09-04 14:02:58 +0300 |
| commit | 7f38db435cf703cc432810362d84ed8be59202ea (patch) | |
| tree | e831554e8dee3c82137b76720b52af1bf558c368 | |
| parent | 11080a5ea877d7da163a93975559b9607f629d49 (diff) | |
drm/i915/wm: use generic poll_timeout_us() instead of wait_for()
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 3
ms.
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://lore.kernel.org/r/52c80860ea7b98e84f2386ed6cdd761f03190b1e.1756383233.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
| -rw-r--r-- | drivers/gpu/drm/i915/display/i9xx_wm.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/display/i9xx_wm.c b/drivers/gpu/drm/i915/display/i9xx_wm.c index 591acce2a4b1..060aff765994 100644 --- a/drivers/gpu/drm/i915/display/i9xx_wm.c +++ b/drivers/gpu/drm/i915/display/i9xx_wm.c @@ -3,6 +3,8 @@ * Copyright © 2023 Intel Corporation */ +#include <linux/iopoll.h> + #include "soc/intel_dram.h" #include "i915_drv.h" @@ -112,6 +114,7 @@ static const struct cxsr_latency *pnv_get_cxsr_latency(struct intel_display *dis static void chv_set_memory_dvfs(struct intel_display *display, bool enable) { u32 val; + int ret; vlv_punit_get(display->drm); @@ -124,8 +127,10 @@ static void chv_set_memory_dvfs(struct intel_display *display, bool enable) val |= FORCE_DDR_FREQ_REQ_ACK; vlv_punit_write(display->drm, PUNIT_REG_DDR_SETUP2, val); - if (wait_for((vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2) & - FORCE_DDR_FREQ_REQ_ACK) == 0, 3)) + ret = poll_timeout_us(val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2), + (val & FORCE_DDR_FREQ_REQ_ACK) == 0, + 500, 3000, false); + if (ret) drm_err(display->drm, "timed out waiting for Punit DDR DVFS request\n"); @@ -3905,6 +3910,7 @@ static void vlv_wm_get_hw_state(struct intel_display *display) struct vlv_wm_values *wm = &display->wm.vlv; struct intel_crtc *crtc; u32 val; + int ret; vlv_read_wm_values(display, wm); @@ -3931,8 +3937,10 @@ static void vlv_wm_get_hw_state(struct intel_display *display) val |= FORCE_DDR_FREQ_REQ_ACK; vlv_punit_write(display->drm, PUNIT_REG_DDR_SETUP2, val); - if (wait_for((vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2) & - FORCE_DDR_FREQ_REQ_ACK) == 0, 3)) { + ret = poll_timeout_us(val = vlv_punit_read(display->drm, PUNIT_REG_DDR_SETUP2), + (val & FORCE_DDR_FREQ_REQ_ACK) == 0, + 500, 3000, false); + if (ret) { drm_dbg_kms(display->drm, "Punit not acking DDR DVFS request, " "assuming DDR DVFS is disabled\n"); |