On 22/06/2021 11:03, Dmitry Baryshkov wrote:
Fix undefined symbols errors arising from 64-bit division on 32-bit
arm targets. Add 64-bit version of mult_frac and use it for calculating
bandwidth.
ERROR: modpost: "__aeabi_ldivmod" [drivers/gpu/drm/msm/msm.ko] undefined!
ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/msm/msm.ko] undefined!
Fixes: 7e0230fd096c ("drm/msm/mdp5: provide dynamic bandwidth management")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
We are reworking now bandwidth management for mdp5, so both the original
patch and the fix can be ignored for now.
---
drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 2 +-
drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 5 ++++-
drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 2 +-
include/linux/math.h | 13 +++++++++++++
4 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
index a9332078aa13..52724d0a6fea 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
@@ -755,7 +755,7 @@ static int mdp5_crtc_atomic_check(struct drm_crtc *crtc,
hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);
if (hw_cfg->perf.ab_inefficiency)
- crtc_bw = mult_frac(crtc_bw, hw_cfg->perf.ab_inefficiency, 100);
+ crtc_bw = mult_frac_ull(crtc_bw, hw_cfg->perf.ab_inefficiency, 100);
mdp5_cstate->new_crtc_bw = crtc_bw;
/*
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 3e1b28d3e41b..85b7093a1218 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -301,6 +301,7 @@ static const struct mdp_kms_funcs kms_funcs = {
void mdp5_kms_set_bandwidth(struct mdp5_kms *mdp5_kms)
{
int i;
+ u64 bw;
u32 full_bw = 0;
struct drm_crtc *tmp_crtc;
@@ -311,7 +312,9 @@ void mdp5_kms_set_bandwidth(struct mdp5_kms *mdp5_kms)
if (!tmp_crtc->enabled)
continue;
- full_bw += Bps_to_icc(to_mdp5_crtc_state(tmp_crtc->state)->new_crtc_bw / mdp5_kms->num_paths);
+ bw = to_mdp5_crtc_state(tmp_crtc->state)->new_crtc_bw;
+ do_div(bw, mdp5_kms->num_paths * 1000); /* Bps_to_icc */
+ full_bw += bw;
}
DBG("SET BW to %d\n", full_bw);
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
index 85275665558b..2ede34177a90 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
@@ -191,7 +191,7 @@ static void mdp5_plane_calc_bw(struct drm_plane_state *state, struct drm_crtc_st
prefill_div = vbp + vpw + vfp;
#endif
- pstate->plane_bw = max(plane_bw, mult_frac(plane_bw, hw_latency_lines, prefill_div));
+ pstate->plane_bw = max(plane_bw, mult_frac_ull(plane_bw, hw_latency_lines, prefill_div));
}
static int mdp5_plane_atomic_check_with_state(struct drm_crtc_state *crtc_state,
diff --git a/include/linux/math.h b/include/linux/math.h
index 53674a327e39..1327385905df 100644
--- a/include/linux/math.h
+++ b/include/linux/math.h
@@ -118,6 +118,19 @@
} \
)
+#define mult_frac_ull(x, numer, denom)( \
+{ \
+ typeof(x) quot = (x); \
+ typeof(x) rem; \
+ do_div(quot, (denom)); \
+ rem = (x) - quot * (denom); \
+ rem = (rem * (numer)); \
+ do_div(rem, (denom)); \
+ (quot * (numer)) + rem; \
+} \
+)
+
+
#define sector_div(a, b) do_div(a, b)
/**
--
With best wishes
Dmitry
