drm/i915/vbt: Fix VBT parsing for the PSR section

A single 32-bit PSR2 training pattern field follows the sixteen element
array of PSR table entries in the VBT spec. But, we incorrectly define
this PSR2 field for each of the PSR table entries. As a result, the PSR1
training pattern duration for any panel_type != 0 will be parsed
incorrectly. Secondly, PSR2 training pattern durations for VBTs with bdb
version >= 226 will also be wrong.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: stable@vger.kernel.org
Cc: stable@vger.kernel.org #v5.2
Fixes: 88a0d9606aff ("drm/i915/vbt: Parse and use the new field with PSR2 TP2/3 wakeup time")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111088
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204183
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Tested-by: François Guerraz <kubrick@fgv6.net>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190717223451.2595-1-dhinakaran.pandiyan@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 21501d565327a98e32a088ac9aed631f9d802ee5..b416b394b6419ad524725928f8170dded8d8c9c9 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -766,7 +766,7 @@ parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
        }
 
        if (bdb->version >= 226) {
-               u32 wakeup_time = psr_table->psr2_tp2_tp3_wakeup_time;
+               u32 wakeup_time = psr->psr2_tp2_tp3_wakeup_time;
 
                wakeup_time = (wakeup_time >> (2 * panel_type)) & 0x3;
                switch (wakeup_time) {

diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
index 93f5c9d204d64e43275f06ad283e9011c1566308..09cd37fb0b1ce9484573f80321a1bba65b12b53a 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
@@ -481,13 +481,13 @@ struct psr_table {
        /* TP wake up time in multiple of 100 */
        u16 tp1_wakeup_time;
        u16 tp2_tp3_wakeup_time;
-
-       /* PSR2 TP2/TP3 wakeup time for 16 panels */
-       u32 psr2_tp2_tp3_wakeup_time;
 } __packed;
 
 struct bdb_psr {
        struct psr_table psr_table[16];
+
+       /* PSR2 TP2/TP3 wakeup time for 16 panels */
+       u32 psr2_tp2_tp3_wakeup_time;
 } __packed;
 
 /*