This is a note to let you know that I've just added the patch titled drm/i915: Update CDCLK_FREQ register on BDW after changing cdclk frequency to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-i915-update-cdclk_freq-register-on-bdw-after-changing-cdclk-frequency.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a04e23d42a1ce5d5f421692bb1c7e9352832819d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx> Date: Tue, 26 Apr 2016 19:46:32 +0300 Subject: drm/i915: Update CDCLK_FREQ register on BDW after changing cdclk frequency MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> commit a04e23d42a1ce5d5f421692bb1c7e9352832819d upstream. Update CDCLK_FREQ on BDW after changing the cdclk frequency. Not sure if this is a late addition to the spec, or if I simply overlooked this step when writing the original code. This is what Bspec has to say about CDCLK_FREQ: "Program this field to the CD clock frequency minus one. This is used to generate a divided down clock for miscellaneous timers in display." And the "Broadwell Sequences for Changing CD Clock Frequency" section clarifies this further: "For CD clock 337.5 MHz, program 337 decimal. For CD clock 450 MHz, program 449 decimal. For CD clock 540 MHz, program 539 decimal. For CD clock 675 MHz, program 674 decimal." Cc: stable@xxxxxxxxxxxxxxx Cc: Mika Kahola <mika.kahola@xxxxxxxxx> Fixes: b432e5cfd5e9 ("drm/i915: BDW clock change support") Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Link: http://patchwork.freedesktop.org/patch/msgid/1461689194-6079-2-git-send-email-ville.syrjala@xxxxxxxxxxxxxxx Reviewed-by: Mika Kahola <mika.kahola@xxxxxxxxx> (cherry picked from commit 7f1052a8fa38df635ab0dc0e6025b64ab9834824) Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_reg.h | 2 ++ drivers/gpu/drm/i915/intel_display.c | 2 ++ 2 files changed, 4 insertions(+) --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7357,6 +7357,8 @@ enum skl_disp_power_wells { #define TRANS_CLK_SEL_DISABLED (0x0<<29) #define TRANS_CLK_SEL_PORT(x) (((x)+1)<<29) +#define CDCLK_FREQ 0x46200 + #define TRANSA_MSA_MISC 0x60410 #define TRANSB_MSA_MISC 0x61410 #define TRANSC_MSA_MISC 0x62410 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9689,6 +9689,8 @@ static void broadwell_set_cdclk(struct d sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ, data); mutex_unlock(&dev_priv->rps.hw_lock); + I915_WRITE(CDCLK_FREQ, DIV_ROUND_CLOSEST(cdclk, 1000) - 1); + intel_update_cdclk(dev); WARN(cdclk != dev_priv->cdclk_freq, Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are queue-4.4/drm-i915-refresh-cached-dp-port-register-value-on-resume.patch queue-4.4/drm-i915-update-cdclk_freq-register-on-bdw-after-changing-cdclk-frequency.patch queue-4.4/drm-i915-ilk-don-t-disable-ssc-source-if-it-s-in-use.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html