platform: msm_shared: modify prefetch start lines
Current code enable prefetch only if the vertical
back porch is less than 9 lines. This change
modifies the behavior to enable prefetch if the vertical
back porch plus the vertical pulse width is less
than 25 lines, so we can have more margin of vertical
timing for prefill.
Change-Id: Idb0eb1d0894ec3cec10cf733ffcba88f6c8e4219
diff --git a/platform/msm_shared/mdp5.c b/platform/msm_shared/mdp5.c
index ddda7ee..9978e3a 100755
--- a/platform/msm_shared/mdp5.c
+++ b/platform/msm_shared/mdp5.c
@@ -40,8 +40,7 @@
#include <clock.h>
#include <scm.h>
-#define MDP_MIN_FETCH 9
-#define MDSS_MDP_MAX_FETCH 12
+#define MDSS_MDP_MAX_PREFILL_FETCH 25
int restore_secure_cfg(uint32_t id);
@@ -538,7 +537,8 @@
uint32_t intf_base)
{
uint32_t mdp_hw_rev = readl(MDP_HW_REV);
- uint32_t v_total, h_total, fetch_start, vfp_start, fetch_lines;
+ uint32_t v_total, h_total, fetch_start, vfp_start;
+ uint32_t prefetch_avail, prefetch_needed;
uint32_t adjust_xres = 0;
uint32_t fetch_enable = BIT(31);
@@ -554,10 +554,11 @@
/*
* MDP programmable fetch is for MDP with rev >= 1.05.
* Programmable fetch is not needed if vertical back porch
- * is >= 9.
+ * plus vertical puls width is >= 25.
*/
if (mdp_hw_rev < MDSS_MDP_HW_REV_105 ||
- lcdc->v_back_porch >= MDP_MIN_FETCH)
+ (lcdc->v_back_porch + lcdc->v_pulse_width) >=
+ MDSS_MDP_MAX_PREFILL_FETCH)
return;
adjust_xres = pinfo->xres;
@@ -574,16 +575,19 @@
lcdc->h_front_porch;
vfp_start = lcdc->v_pulse_width + lcdc->v_back_porch + pinfo->yres;
- fetch_lines = v_total - vfp_start;
+ prefetch_avail = v_total - vfp_start;
+ prefetch_needed = MDSS_MDP_MAX_PREFILL_FETCH -
+ lcdc->v_back_porch -
+ lcdc->v_pulse_width;
/*
* In some cases, vertical front porch is too high. In such cases limit
- * the mdp fetch lines as the last 12 lines of vertical front porch.
+ * the mdp fetch lines as the last (25 - vbp - vpw) lines of vertical front porch.
*/
- if (fetch_lines > MDSS_MDP_MAX_FETCH)
- fetch_lines = MDSS_MDP_MAX_FETCH;
+ if (prefetch_avail > prefetch_needed)
+ prefetch_avail = prefetch_needed;
- fetch_start = (v_total - fetch_lines) * h_total + 1;
+ fetch_start = (v_total - prefetch_avail) * h_total + 1;
if (pinfo->dfps.panel_dfps.enabled)
fetch_enable |= BIT(23);