From 465ff12be96159ef7173ae7a03ed7d24a3b37990 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Sat, 21 Sep 2013 13:47:57 -0400 Subject: [PATCH 1/6] drm/radeon/dpm: fetch the max clk from voltage dep tables helper This patch adds a helper function to fetch the max clock from the voltage clock dependecy tables. Clocks above that level tend to be unstable and may require voltage tweaks. This patch implemented the helper function to fetch the max clocks from the dependency tables. The following patches implement the per-asic clock filtering. See bug: https://bugs.freedesktop.org/show_bug.cgi?id=68235 Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/btc_dpm.c | 17 +++++++++++++++++ drivers/gpu/drm/radeon/btc_dpm.h | 2 ++ 2 files changed, 19 insertions(+) diff --git a/drivers/gpu/drm/radeon/btc_dpm.c b/drivers/gpu/drm/radeon/btc_dpm.c index 05ff315..0d0f065 100644 --- a/drivers/gpu/drm/radeon/btc_dpm.c +++ b/drivers/gpu/drm/radeon/btc_dpm.c @@ -1168,6 +1168,23 @@ static const struct radeon_blacklist_clocks btc_blacklist_clocks[] = { 25000, 30000, RADEON_SCLK_UP } }; +void btc_get_max_clock_from_voltage_dependency_table(struct radeon_clock_voltage_dependency_table *table, + u32 *max_clock) +{ + u32 i, clock = 0; + + if ((table == NULL) || (table->count == 0)) { + *max_clock = clock; + return; + } + + for (i = 0; i < table->count; i++) { + if (clock < table->entries[i].clk) + clock = table->entries[i].clk; + } + *max_clock = clock; +} + void btc_apply_voltage_dependency_rules(struct radeon_clock_voltage_dependency_table *table, u32 clock, u16 max_voltage, u16 *voltage) { diff --git a/drivers/gpu/drm/radeon/btc_dpm.h b/drivers/gpu/drm/radeon/btc_dpm.h index 1a15e0e..3b6f12b 100644 --- a/drivers/gpu/drm/radeon/btc_dpm.h +++ b/drivers/gpu/drm/radeon/btc_dpm.h @@ -46,6 +46,8 @@ void btc_adjust_clock_combinations(struct radeon_device *rdev, struct rv7xx_pl *pl); void btc_apply_voltage_dependency_rules(struct radeon_clock_voltage_dependency_table *table, u32 clock, u16 max_voltage, u16 *voltage); +void btc_get_max_clock_from_voltage_dependency_table(struct radeon_clock_voltage_dependency_table *table, + u32 *max_clock); void btc_apply_voltage_delta_rules(struct radeon_device *rdev, u16 max_vddc, u16 max_vddci, u16 *vddc, u16 *vddci); -- 1.8.3.1