From: Linus Walleij Date: Sun, 8 Sep 2024 21:50:30 +0000 (+0200) Subject: drm/panel: nt35510: Make new commands optional X-Git-Tag: v6.13-rc1~122^2~22^2~115 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2418aa8516b26c5e332a1a8c216d4d620f965a56;p=thirdparty%2Fkernel%2Flinux.git drm/panel: nt35510: Make new commands optional The commit introducing the Frida display started to write the SETVCMOFF registers unconditionally, and some (not all!) Hydis display seem to be affected by ghosting after the commit. Make SETVCMOFF optional and only send these commands on the Frida display for now. Reported-by: Stefan Hansson Fixes: 219a1f49094f ("drm/panel: nt35510: support FRIDA FRD400B25025-A-CTK") Acked-by: Jessica Zhang Tested-by: Stefan Hansson Signed-off-by: Linus Walleij Link: https://patchwork.freedesktop.org/patch/msgid/20240908-fix-nt35510-v2-1-d4834b9cdb9b@linaro.org --- diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35510.c b/drivers/gpu/drm/panel/panel-novatek-nt35510.c index 57686340de49f..549b86f2cc288 100644 --- a/drivers/gpu/drm/panel/panel-novatek-nt35510.c +++ b/drivers/gpu/drm/panel/panel-novatek-nt35510.c @@ -38,6 +38,7 @@ #define NT35510_CMD_CORRECT_GAMMA BIT(0) #define NT35510_CMD_CONTROL_DISPLAY BIT(1) +#define NT35510_CMD_SETVCMOFF BIT(2) #define MCS_CMD_MAUCCTR 0xF0 /* Manufacturer command enable */ #define MCS_CMD_READ_ID1 0xDA @@ -721,11 +722,13 @@ static int nt35510_setup_power(struct nt35510 *nt) if (ret) return ret; - ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVCMOFF, - NT35510_P1_VCMOFF_LEN, - nt->conf->vcmoff); - if (ret) - return ret; + if (nt->conf->cmds & NT35510_CMD_SETVCMOFF) { + ret = nt35510_send_long(nt, dsi, NT35510_P1_SETVCMOFF, + NT35510_P1_VCMOFF_LEN, + nt->conf->vcmoff); + if (ret) + return ret; + } /* Typically 10 ms */ usleep_range(10000, 20000); @@ -1319,7 +1322,7 @@ static const struct nt35510_config nt35510_frida_frd400b25025 = { }, .mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM, - .cmds = NT35510_CMD_CONTROL_DISPLAY, + .cmds = NT35510_CMD_CONTROL_DISPLAY | NT35510_CMD_SETVCMOFF, /* 0x03: AVDD = 6.2V */ .avdd = { 0x03, 0x03, 0x03 }, /* 0x46: PCK = 2 x Hsync, BTP = 2.5 x VDDB */