From: José Roberto de Souza Date: Thu, 14 Mar 2019 23:01:13 +0000 (-0700) Subject: drm/i915: Fix PSR2 selective update corruption after PSR1 setup X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=06dd94cccdd142423fa5ce9f5c3ea0274ca84709;p=openwrt%2Fstaging%2Fblogic.git drm/i915: Fix PSR2 selective update corruption after PSR1 setup There is probably a issue in DMC firmwares(icl_dmc_ver1_07.bin and kbl_dmc_ver1_04.bin at least) that causes PSR2 SU to fail after exiting DC6 if EDP_PSR_TP1_TP3_SEL is kept in PSR_CTL, so for now lets workaround the issue by cleaning PSR_CTL before enable PSR2. v2: - Updated commit description and comment to state that it may be a DMC firmware issue (Rodrigo) - No need to RMW, let's write 0 to PSR_CTL(Dhinakaran) Cc: Dhinakaran Pandiyan Cc: Rodrigo Vivi Signed-off-by: José Roberto de Souza Reviewed-by: Rodrigo Vivi Reviewed-by: Dhinakaran Pandiyan Link: https://patchwork.freedesktop.org/patch/msgid/20190314230113.6571-1-jose.souza@intel.com --- diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c index 29aa0e90cc0c..605fe8fc85cc 100644 --- a/drivers/gpu/drm/i915/intel_psr.c +++ b/drivers/gpu/drm/i915/intel_psr.c @@ -530,6 +530,14 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp) else val |= EDP_PSR2_TP2_TIME_2500us; + /* + * FIXME: There is probably a issue in DMC firmwares(icl_dmc_ver1_07.bin + * and kbl_dmc_ver1_04.bin at least) that causes PSR2 SU to fail after + * exiting DC6 if EDP_PSR_TP1_TP3_SEL is kept in PSR_CTL, so for now + * lets workaround the issue by cleaning PSR_CTL before enable PSR2. + */ + I915_WRITE(EDP_PSR_CTL, 0); + I915_WRITE(EDP_PSR2_CTL, val); }