From: Mengdong Lin mengdong.lin@intel.com
For HSW/BDW display HD-A controller, hda_set_bclk() is defined to set BCLK by programming the M/N values as per the core display clock (CDCLK) queried from i915 display driver.
And the audio driver will also set BCLK in azx_first_init() since the display driver can turn off the shared power in boot phase if only eDP is connected and M/N values will be lost and must be reprogrammed.
Signed-off-by: Mengdong Lin mengdong.lin@intel.com
diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c index e9e8a4a..8b4940b 100644 --- a/sound/pci/hda/hda_i915.c +++ b/sound/pci/hda/hda_i915.c @@ -20,10 +20,20 @@ #include <linux/module.h> #include <sound/core.h> #include <drm/i915_powerwell.h> +#include "hda_priv.h" #include "hda_i915.h"
+/* Intel HSW/BDW display HDA controller Extended Mode registers. + * EM4 (M value) and EM5 (N Value) are used to convert CDClk (Core Display + * Clock) to 24MHz BCLK: BCLK = CDCLK * M / N + * The values will be lost when the display power well is disabled. + */ +#define ICH6_REG_EM4 0x100c +#define ICH6_REG_EM5 0x1010 + static int (*get_power)(void); static int (*put_power)(void); +static int (*get_cdclk)(void);
int hda_display_power(bool enable) { @@ -38,6 +48,43 @@ int hda_display_power(bool enable) return put_power(); }
+void haswell_set_bclk(struct azx *chip) +{ + int cdclk_freq; + unsigned int bclk_m, bclk_n; + + if (!get_cdclk) + return; + + cdclk_freq = get_cdclk(); + switch (cdclk_freq) { + case 337500: + bclk_m = 16; + bclk_n = 225; + break; + + case 450000: + default: /* default CDCLK 450MHz */ + bclk_m = 4; + bclk_n = 75; + break; + + case 540000: + bclk_m = 4; + bclk_n = 90; + break; + + case 675000: + bclk_m = 8; + bclk_n = 225; + break; + } + + azx_writew(chip, EM4, bclk_m); + azx_writew(chip, EM5, bclk_n); +} + + int hda_i915_init(void) { int err = 0; @@ -55,6 +102,10 @@ int hda_i915_init(void) return -ENODEV; }
+ get_cdclk = symbol_request(i915_get_cdclk_freq); + if (!get_cdclk) /* may have abnormal BCLK and audio playback rate */ + pr_warn("hda-i915: get_cdclk symbol get fail\n"); + pr_debug("HDA driver get symbol successfully from i915 module\n");
return err; @@ -70,6 +121,10 @@ int hda_i915_exit(void) symbol_put(i915_release_power_well); put_power = NULL; } + if (get_cdclk) { + symbol_put(i915_get_cdclk_freq); + get_cdclk = NULL; + }
return 0; } diff --git a/sound/pci/hda/hda_i915.h b/sound/pci/hda/hda_i915.h index bfd835f..9237340 100644 --- a/sound/pci/hda/hda_i915.h +++ b/sound/pci/hda/hda_i915.h @@ -18,6 +18,7 @@
#ifdef CONFIG_SND_HDA_I915 int hda_display_power(bool enable); +void haswell_set_bclk(struct azx *chip); int hda_i915_init(void); int hda_i915_exit(void); #else diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 25753db..b6b4e71 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -62,9 +62,9 @@ #include <linux/vga_switcheroo.h> #include <linux/firmware.h> #include "hda_codec.h" -#include "hda_i915.h" #include "hda_controller.h" #include "hda_priv.h" +#include "hda_i915.h"
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; @@ -288,21 +288,8 @@ static char *driver_short_names[] = { [AZX_DRIVER_GENERIC] = "HD-Audio Generic", };
- -/* Intel HSW/BDW display HDA controller Extended Mode registers. - * EM4 (M value) and EM5 (N Value) are used to convert CDClk (Core Display - * Clock) to 24MHz BCLK: BCLK = CDCLK * M / N - * The values will be lost when the display power well is disabled. - */ -#define ICH6_REG_EM4 0x100c -#define ICH6_REG_EM5 0x1010 - struct hda_intel { struct azx chip; - - /* HSW/BDW display HDA controller to restore BCLK from CDCLK */ - unsigned int bclk_m; - unsigned int bclk_n; };
@@ -598,22 +585,6 @@ static int param_set_xint(const char *val, const struct kernel_param *kp) #define azx_del_card_list(chip) /* NOP */ #endif /* CONFIG_PM */
-static void haswell_save_bclk(struct azx *chip) -{ - struct hda_intel *hda = container_of(chip, struct hda_intel, chip); - - hda->bclk_m = azx_readw(chip, EM4); - hda->bclk_n = azx_readw(chip, EM5); -} - -static void haswell_restore_bclk(struct azx *chip) -{ - struct hda_intel *hda = container_of(chip, struct hda_intel, chip); - - azx_writew(chip, EM4, hda->bclk_m); - azx_writew(chip, EM5, hda->bclk_n); -} - #if defined(CONFIG_PM_SLEEP) || defined(SUPPORT_VGA_SWITCHEROO) /* * power management @@ -641,12 +612,6 @@ static int azx_suspend(struct device *dev) chip->irq = -1; }
- /* Save BCLK M/N values before they become invalid in D3. - * Will test if display power well can be released now. - */ - if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) - haswell_save_bclk(chip); - if (chip->msi) pci_disable_msi(chip->pci); pci_disable_device(pci); @@ -668,7 +633,7 @@ static int azx_resume(struct device *dev)
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) { hda_display_power(true); - haswell_restore_bclk(chip); + haswell_set_bclk(chip); } pci_set_power_state(pci, PCI_D0); pci_restore_state(pci); @@ -713,10 +678,9 @@ static int azx_runtime_suspend(struct device *dev) azx_stop_chip(chip); azx_enter_link_reset(chip); azx_clear_irq_pending(chip); - if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) { - haswell_save_bclk(chip); + if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) hda_display_power(false); - } + return 0; }
@@ -736,7 +700,7 @@ static int azx_runtime_resume(struct device *dev)
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) { hda_display_power(true); - haswell_restore_bclk(chip); + haswell_set_bclk(chip); }
/* Read STATESTS before controller reset */ @@ -1426,6 +1390,10 @@ static int azx_first_init(struct azx *chip)
/* initialize chip */ azx_init_pci(chip); + + if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) + haswell_set_bclk(chip); + azx_init_chip(chip, (probe_only[dev] & 2) == 0);
/* codec detection */