diff options
| author | Xin Xie <xxie@nvidia.com> | 2011-06-30 16:06:57 -0700 |
|---|---|---|
| committer | Niket Sirsi <nsirsi@nvidia.com> | 2011-07-21 18:02:02 -0700 |
| commit | 9ce7a159660b9f9087a4d655b4155d199a6e4eff (patch) | |
| tree | c8b7723a5b0c4a4b9b9453e0cf6560d643d08a24 | |
| parent | 2646dd1d3b3d8676f6e9a98bfb710c32396d7f33 (diff) | |
tegra: dc: change EMC efficiency for bandwidth
BUG 835372
Change-Id: I571ca8785893df339175306f548daa31158721fd
Reviewed-on: http://git-master/r/39277
Reviewed-by: Xin Xie <xxie@nvidia.com>
Tested-by: Xin Xie <xxie@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
| -rw-r--r-- | drivers/video/tegra/dc/dc.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/video/tegra/dc/dc.c b/drivers/video/tegra/dc/dc.c index fef8bb84f46f..4e15e0a5d662 100644 --- a/drivers/video/tegra/dc/dc.c +++ b/drivers/video/tegra/dc/dc.c @@ -531,11 +531,6 @@ static unsigned int tegra_dc_find_max_bandwidth(struct tegra_dc_win *wins[], /* 8 bits per byte (1 << 3) */ #define BIT_TO_BYTE_SHIFT 3 -/* - * Assuming 50% (X >> 1) efficiency: i.e. if we calculate we need 70MBps, we - * will request 140MBps from EMC. - */ -#define MEM_EFFICIENCY_SHIFT 1 static unsigned long tegra_dc_get_emc_rate(struct tegra_dc_win *wins[], int n) { int i; @@ -571,7 +566,9 @@ static unsigned long tegra_dc_get_emc_rate(struct tegra_dc_win *wins[], int n) (WIN_IS_TILED(w) ? TILED_WINDOWS_BW_MULTIPLIER : 1); } - max = tegra_dc_find_max_bandwidth(wins, bw, n) << MEM_EFFICIENCY_SHIFT; + max = tegra_dc_find_max_bandwidth(wins, bw, n); + /* multiply bandwidth by 2.5 assuming 40% memory efficiency */ + max = (max << 1) + (max >> 1); ret = EMC_BW_TO_FREQ(max); @@ -585,7 +582,6 @@ static unsigned long tegra_dc_get_emc_rate(struct tegra_dc_win *wins[], int n) return ret; } #undef BIT_TO_BYTE_SHIFT -#undef MEM_EFFICIENCY_SHIFT static void tegra_dc_change_emc(struct tegra_dc *dc) { |