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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
90 lines
3.4 KiB
Diff
90 lines
3.4 KiB
Diff
From 12b60ef71cc005ee7290f692169d46a7e78df01a Mon Sep 17 00:00:00 2001
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From: Yukimasa Sugizaki <4298265+Terminus-IMRC@users.noreply.github.com>
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Date: Fri, 20 Mar 2020 19:01:23 +0900
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Subject: [PATCH] drm/v3d: Replace wait_for macros to remove use of
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msleep (#3510)
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commit 9daee6141cc9c75b09659b02b1cb9eeb2f5e16cc upstream.
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The wait_for macro's for Broadcom V3D driver used msleep, which is
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inappropriate due to its inaccuracy at low values (minimum wait time
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is about 30ms on the Raspberry Pi). This sleep was triggering in
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v3d_clean_caches(), causing us to only be able to dispatch ~33 compute
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jobs per second.
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This patch replaces the macro with the one from the Intel i915 version
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which uses usleep_range to provide more accurate waits.
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v2: Split from the vc4 patch so that we can confidently apply to
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stable (by anholt)
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Signed-off-by: James Hughes <james.hughes@raspberrypi.com>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Link: https://patchwork.freedesktop.org/patch/msgid/20200217153145.13780-1-james.hughes@raspberrypi.com
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Link: https://github.com/raspberrypi/linux/issues/3460
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Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
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Co-authored-by: James Hughes <james.hughes@raspberrypi.com>
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---
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drivers/gpu/drm/v3d/v3d_drv.h | 41 ++++++++++++++++++++++++-----------
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1 file changed, 28 insertions(+), 13 deletions(-)
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--- a/drivers/gpu/drm/v3d/v3d_drv.h
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+++ b/drivers/gpu/drm/v3d/v3d_drv.h
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@@ -260,27 +260,42 @@ struct v3d_csd_job {
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};
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/**
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- * _wait_for - magic (register) wait macro
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+ * __wait_for - magic wait macro
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*
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- * Does the right thing for modeset paths when run under kdgb or similar atomic
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- * contexts. Note that it's important that we check the condition again after
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- * having timed out, since the timeout could be due to preemption or similar and
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- * we've never had a chance to check the condition before the timeout.
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+ * Macro to help avoid open coding check/wait/timeout patterns. Note that it's
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+ * important that we check the condition again after having timed out, since the
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+ * timeout could be due to preemption or similar and we've never had a chance to
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+ * check the condition before the timeout.
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*/
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-#define wait_for(COND, MS) ({ \
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- unsigned long timeout__ = jiffies + msecs_to_jiffies(MS) + 1; \
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- int ret__ = 0; \
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- while (!(COND)) { \
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- if (time_after(jiffies, timeout__)) { \
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- if (!(COND)) \
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- ret__ = -ETIMEDOUT; \
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+#define __wait_for(OP, COND, US, Wmin, Wmax) ({ \
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+ const ktime_t end__ = ktime_add_ns(ktime_get_raw(), 1000ll * (US)); \
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+ long wait__ = (Wmin); /* recommended min for usleep is 10 us */ \
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+ int ret__; \
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+ might_sleep(); \
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+ for (;;) { \
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+ const bool expired__ = ktime_after(ktime_get_raw(), end__); \
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+ OP; \
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+ /* Guarantee COND check prior to timeout */ \
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+ barrier(); \
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+ if (COND) { \
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+ ret__ = 0; \
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break; \
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} \
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- msleep(1); \
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+ if (expired__) { \
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+ ret__ = -ETIMEDOUT; \
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+ break; \
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+ } \
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+ usleep_range(wait__, wait__ * 2); \
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+ if (wait__ < (Wmax)) \
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+ wait__ <<= 1; \
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} \
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ret__; \
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})
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+#define _wait_for(COND, US, Wmin, Wmax) __wait_for(, (COND), (US), (Wmin), \
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+ (Wmax))
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+#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000)
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+
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static inline unsigned long nsecs_to_jiffies_timeout(const u64 n)
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{
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/* nsecs_to_jiffies64() does not guard against overflow */
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