[08/12] drm/i915: use i9xx_fsb_freq() for GT clock frequency

Commit Message

Jani Nikula May 28, 2024, 2:24 p.m. UTC

Reuse i9xx_fsb_freq() for GT clock frequency initialization instead of
depending on rawclk_freq.

Note: If the init order was changed, we could use i915->fsb_freq
directly. However, GT clock initialization is done in
i915_driver_mmio_probe(), but intel_dram_detect() later in
i915_driver_hw_probe(), with a dependency on intel_pcode_init().

Signed-off-by: Jani Nikula <[e-mail]>
---
 drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c | 3 ++-
 drivers/gpu/drm/i915/soc/intel_dram.c          | 2 +-
 drivers/gpu/drm/i915/soc/intel_dram.h          | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c b/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c
index 7c9be4fd1c8c..6e63505fe478 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c
@@ -9,6 +9,7 @@ 
 #include "intel_gt_clock_utils.h"
 #include "intel_gt_print.h"
 #include "intel_gt_regs.h"
+#include "soc/intel_dram.h"
 
 static u32 read_reference_ts_freq(struct intel_uncore *uncore)
 {
@@ -151,7 +152,7 @@  static u32 gen4_read_clock_frequency(struct intel_uncore *uncore)
 	 *
 	 * Testing on actual hardware has shown there is no /16.
 	 */
-	return RUNTIME_INFO(uncore->i915)->rawclk_freq * 1000;
+	return DIV_ROUND_CLOSEST(i9xx_fsb_freq(uncore->i915), 4) * 1000;
 }
 
 static u32 read_clock_frequency(struct intel_uncore *uncore)
diff --git a/drivers/gpu/drm/i915/soc/intel_dram.c b/drivers/gpu/drm/i915/soc/intel_dram.c
index 74b5b70e91f9..389bcf4b1abd 100644
--- a/drivers/gpu/drm/i915/soc/intel_dram.c
+++ b/drivers/gpu/drm/i915/soc/intel_dram.c
@@ -142,7 +142,7 @@  static void detect_mem_freq(struct drm_i915_private *i915)
 		drm_dbg(&i915->drm, "DDR speed: %d kHz\n", i915->mem_freq);
 }
 
-static unsigned int i9xx_fsb_freq(struct drm_i915_private *i915)
+unsigned int i9xx_fsb_freq(struct drm_i915_private *i915)
 {
 	u32 fsb;
 
diff --git a/drivers/gpu/drm/i915/soc/intel_dram.h b/drivers/gpu/drm/i915/soc/intel_dram.h
index 4ba13c13162c..a10136eda674 100644
--- a/drivers/gpu/drm/i915/soc/intel_dram.h
+++ b/drivers/gpu/drm/i915/soc/intel_dram.h
@@ -10,5 +10,6 @@  struct drm_i915_private;
 
 void intel_dram_edram_detect(struct drm_i915_private *i915);
 void intel_dram_detect(struct drm_i915_private *i915);
+unsigned int i9xx_fsb_freq(struct drm_i915_private *i915);
 
 #endif /* __INTEL_DRAM_H__ */