On Thu, Apr 19, 2018 at 11:59:40AM +0300, Jani Nikula wrote:
Current CHV and BXT bspec says the dphy param register has four 8-bit fields instead of the smaller VLV field widths. CHV bspec mentions the register has changed since K0, but there's no indication of what exactly changed. Lacking further details, change the field widths for all CHV and later.
K0 didn't happen, and looks like the linked HSD specifically says that this change was meant for K0. So I suspect this patch is wrong.
The BXT HSD says planned for B0, but not sure if that actually happened either.
On my VLV the reserved bits can't be set: intel_reg write 0x180000:0xb080 0xffffffff intel_reg write 0x180000:0xb880 0xffffffff intel_reg read 0x180000:0xb080 0x180000:0xb880 (0x00180000:0x0000b080): 0x3f1fff3f (0x00180000:0x0000b880): 0x3f1fff3f
So presumably the same rmw trick could be used to check what how many bits we have on CHV/BXT.
Also looks like the CHV spec was forked from VLV before someone fixed the prepare count to be 6 bits, which seems to be what my VLV actually has as well. Not the first time the VLV docs are more up to date than the CHV ones unfortunately.
Define the max values based on the platform. Also define them based on the register definitions instead of duplicating information.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106130 Cc: stable@vger.kernel.org Cc: Ville Syrjälä ville.syrjala@linux.intel.com Signed-off-by: Jani Nikula jani.nikula@intel.com
drivers/gpu/drm/i915/i915_reg.h | 11 +++++++---- drivers/gpu/drm/i915/intel_dsi_vbt.c | 31 +++++++++++++++++++------------ 2 files changed, 26 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index fb106026a1f4..f4435a13b757 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -9547,14 +9547,17 @@ enum skl_power_gate { #define _MIPIA_DPHY_PARAM (dev_priv->mipi_mmio_base + 0xb080) #define _MIPIC_DPHY_PARAM (dev_priv->mipi_mmio_base + 0xb880) #define MIPI_DPHY_PARAM(port) _MMIO_MIPI(port, _MIPIA_DPHY_PARAM, _MIPIC_DPHY_PARAM) -#define EXIT_ZERO_COUNT_SHIFT 24 #define EXIT_ZERO_COUNT_MASK (0x3f << 24) -#define TRAIL_COUNT_SHIFT 16 +#define EXIT_ZERO_COUNT_MASK_CHV (0xff << 24) +#define EXIT_ZERO_COUNT_SHIFT 24 #define TRAIL_COUNT_MASK (0x1f << 16) -#define CLK_ZERO_COUNT_SHIFT 8 +#define TRAIL_COUNT_MASK_CHV (0xff << 16) +#define TRAIL_COUNT_SHIFT 16 #define CLK_ZERO_COUNT_MASK (0xff << 8) -#define PREPARE_COUNT_SHIFT 0 +#define CLK_ZERO_COUNT_SHIFT 8 #define PREPARE_COUNT_MASK (0x3f << 0) +#define PREPARE_COUNT_MASK_CHV (0xff << 0) +#define PREPARE_COUNT_SHIFT 0 /* bits 31:0 */ #define _MIPIA_DBI_BW_CTRL (dev_priv->mipi_mmio_base + 0xb084) diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c index 4d6ffa7b3e7b..8d3dea693840 100644 --- a/drivers/gpu/drm/i915/intel_dsi_vbt.c +++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c @@ -41,10 +41,17 @@ #define MIPI_VIRTUAL_CHANNEL_SHIFT 1 #define MIPI_PORT_SHIFT 3 -#define PREPARE_CNT_MAX 0x3F -#define EXIT_ZERO_CNT_MAX 0x3F -#define CLK_ZERO_CNT_MAX 0xFF -#define TRAIL_CNT_MAX 0x1F +#define EXIT_ZERO_CNT_MAX(dev_priv) \
- ((IS_VALLEYVIEW(dev_priv) ? EXIT_ZERO_COUNT_MASK : EXIT_ZERO_COUNT_MASK_CHV) >> EXIT_ZERO_COUNT_SHIFT)
+#define TRAIL_CNT_MAX(dev_priv) \
- ((IS_VALLEYVIEW(dev_priv) ? TRAIL_COUNT_MASK : TRAIL_COUNT_MASK_CHV) >> TRAIL_COUNT_SHIFT)
+#define CLK_ZERO_CNT_MAX(dev_priv) \
- (CLK_ZERO_COUNT_MASK >> CLK_ZERO_COUNT_SHIFT)
+#define PREPARE_CNT_MAX(dev_priv) \
- ((IS_VALLEYVIEW(dev_priv) ? PREPARE_COUNT_MASK : PREPARE_COUNT_MASK_CHV) >> PREPARE_COUNT_SHIFT)
#define NS_KHZ_RATIO 1000000 @@ -647,9 +654,9 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) /* prepare count */ prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
- if (prepare_cnt > PREPARE_CNT_MAX) {
- if (prepare_cnt > PREPARE_CNT_MAX(dev_priv)) { DRM_DEBUG_KMS("prepare count too high %u\n", prepare_cnt);
prepare_cnt = PREPARE_CNT_MAX;
prepare_cnt = PREPARE_CNT_MAX(dev_priv);/* exit zero count */ @@ -667,9 +674,9 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) if (exit_zero_cnt < (55 * ui_den / ui_num) && (55 * ui_den) % ui_num) exit_zero_cnt += 1;
- if (exit_zero_cnt > EXIT_ZERO_CNT_MAX) {
- if (exit_zero_cnt > EXIT_ZERO_CNT_MAX(dev_priv)) { DRM_DEBUG_KMS("exit zero count too high %u\n", exit_zero_cnt);
exit_zero_cnt = EXIT_ZERO_CNT_MAX;
exit_zero_cnt = EXIT_ZERO_CNT_MAX(dev_priv);/* clk zero count */ @@ -677,18 +684,18 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) (tclk_prepare_clkzero - ths_prepare_ns) * ui_den, ui_num * mul);
- if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
- if (clk_zero_cnt > CLK_ZERO_CNT_MAX(dev_priv)) { DRM_DEBUG_KMS("clock zero count too high %u\n", clk_zero_cnt);
clk_zero_cnt = CLK_ZERO_CNT_MAX;
clk_zero_cnt = CLK_ZERO_CNT_MAX(dev_priv);/* trail count */ tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail); trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
- if (trail_cnt > TRAIL_CNT_MAX) {
- if (trail_cnt > TRAIL_CNT_MAX(dev_priv)) { DRM_DEBUG_KMS("trail count too high %u\n", trail_cnt);
trail_cnt = TRAIL_CNT_MAX;
trail_cnt = TRAIL_CNT_MAX(dev_priv);/* B080 */ -- 2.11.0