diff options
| author | Xin Ji <xji@analogixsemi.com> | 2021-08-06 12:44:07 +0200 |
|---|---|---|
| committer | Robert Foss <robert.foss@linaro.org> | 2021-08-06 12:48:54 +0200 |
| commit | 7d066dc73929d5b14501a47ae9cad4f49fe22abc (patch) | |
| tree | 4469ce171299265680d94d489b9545defb34f697 /drivers/gpu/drm/bridge/analogix | |
| parent | drm: bridge: it66121: Check drm_bridge_attach retval (diff) | |
| download | linux-7d066dc73929d5b14501a47ae9cad4f49fe22abc.tar.xz linux-7d066dc73929d5b14501a47ae9cad4f49fe22abc.zip | |
drm/bridge: anx7625: Tune K value for IVO panel
IVO panel require less input video clock variation than video clock
variation in DP CTS spec.
This patch decreases the K value of ANX7625 which will shrink eDP Tx
video clock variation to meet IVO panel's requirement.
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Xin Ji <xji@analogixsemi.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210806104407.2208538-1-xji@analogixsemi.com
Diffstat (limited to 'drivers/gpu/drm/bridge/analogix')
| -rw-r--r-- | drivers/gpu/drm/bridge/analogix/anx7625.c | 24 | ||||
| -rw-r--r-- | drivers/gpu/drm/bridge/analogix/anx7625.h | 4 |
2 files changed, 24 insertions, 4 deletions
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 920824d8df2f..14d73fb1dd15 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -384,6 +384,25 @@ static int anx7625_odfc_config(struct anx7625_data *ctx, return ret; } +/* + * The MIPI source video data exist large variation (e.g. 59Hz ~ 61Hz), + * anx7625 defined K ratio for matching MIPI input video clock and + * DP output video clock. Increase K value can match bigger video data + * variation. IVO panel has small variation than DP CTS spec, need + * decrease the K value. + */ +static int anx7625_set_k_value(struct anx7625_data *ctx) +{ + struct edid *edid = (struct edid *)ctx->slimport_edid_p.edid_raw_data; + + if (edid->mfg_id[0] == IVO_MID0 && edid->mfg_id[1] == IVO_MID1) + return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, + MIPI_DIGITAL_ADJ_1, 0x3B); + + return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, + MIPI_DIGITAL_ADJ_1, 0x3D); +} + static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx) { struct device *dev = &ctx->client->dev; @@ -470,9 +489,8 @@ static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx) MIPI_PLL_N_NUM_15_8, (n >> 8) & 0xff); ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, MIPI_PLL_N_NUM_7_0, (n & 0xff)); - /* Diff */ - ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, - MIPI_DIGITAL_ADJ_1, 0x3D); + + anx7625_set_k_value(ctx); ret |= anx7625_odfc_config(ctx, post_divider - 1); diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h index 034c3840028f..6dcf64c703f9 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.h +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h @@ -210,7 +210,9 @@ #define MIPI_VIDEO_STABLE_CNT 0x0A #define MIPI_LANE_CTRL_10 0x0F -#define MIPI_DIGITAL_ADJ_1 0x1B +#define MIPI_DIGITAL_ADJ_1 0x1B +#define IVO_MID0 0x26 +#define IVO_MID1 0xCF #define MIPI_PLL_M_NUM_23_16 0x1E #define MIPI_PLL_M_NUM_15_8 0x1F |