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drm/panel/panel-sitronix-st7701: Infer horizontal pixel count from TFT mode

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The horizontal pixel count is a property of the TFT matrix. Currently the
driver hard-codes content of this register to specific value which is
only compatible with one TFT matrix, likely the TS8550B one.

Calculate the horizontal pixel count from the mode instead.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220710194437.289042-7-marex@denx.de
This commit is contained in:
Marek Vasut 2022-07-10 21:44:35 +02:00 • committed by Linus Walleij
parent 82f9cee255
commit de2b491784
1 changed files with 15 additions and 6 deletions
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21
drivers/gpu/drm/panel/panel-sitronix-st7701.c
View file

@ -74,11 +74,9 @@
#define DSI_CMD2_BK0_LNESET_LINEDELTA GENMASK(1, 0)
#define DSI_CMD2_BK0_PORCTRL_VBP_MASK GENMASK(7, 0)
#define DSI_CMD2_BK0_PORCTRL_VFP_MASK GENMASK(7, 0)
#define DSI_INVSEL_DEFAULT GENMASK(5, 4)
#define DSI_INVSEL_NLINV GENMASK(2, 0)
#define DSI_INVSEL_RTNI GENMASK(2, 1)
#define DSI_CMD2_BK0_INVSEL_B1 DSI_INVSEL_RTNI
#define DSI_CMD2_BK0_INVSEL_B0 (DSI_INVSEL_DEFAULT | DSI_INVSEL_NLINV)
#define DSI_CMD2_BK0_INVSEL_ONES_MASK GENMASK(5, 4)
#define DSI_CMD2_BK0_INVSEL_NLINV_MASK GENMASK(2, 0)
#define DSI_CMD2_BK0_INVSEL_RTNI_MASK GENMASK(4, 0)
/* Command2, BK1 bytes */
#define DSI_CMD2_BK1_VRHA_SET 0x45
@ -114,6 +112,7 @@ struct st7701_panel_desc {
/* TFT matrix driver configuration, panel specific. */
const u8 pv_gamma[16]; /* Positive voltage gamma control */
const u8 nv_gamma[16]; /* Negative voltage gamma control */
const u8 nlinv; /* Inversion selection */
};
struct st7701 {
@ -186,8 +185,17 @@ static void st7701_init_sequence(struct st7701 *st7701)
mode->vtotal - mode->vsync_end),
FIELD_PREP(DSI_CMD2_BK0_PORCTRL_VFP_MASK,
mode->vsync_start - mode->vdisplay));
/*
* Horizontal pixel count configuration:
* PCLK = 512 + (RTNI[4:0] * 16)
* The PCLK is number of pixel clock per line, which matches
* mode htotal. The minimum is 512 PCLK.
*/
ST7701_DSI(st7701, DSI_CMD2_BK0_INVSEL,
DSI_CMD2_BK0_INVSEL_B0, DSI_CMD2_BK0_INVSEL_B1);
DSI_CMD2_BK0_INVSEL_ONES_MASK |
FIELD_PREP(DSI_CMD2_BK0_INVSEL_NLINV_MASK, desc->nlinv),
FIELD_PREP(DSI_CMD2_BK0_INVSEL_RTNI_MASK,
DIV_ROUND_UP(mode->htotal, 16)));
/* Command2, BK1 */
ST7701_DSI(st7701, DSI_CMD2BKX_SEL,
@ -410,6 +418,7 @@ static const struct st7701_panel_desc ts8550b_desc = {
CFIELD_PREP(DSI_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
CFIELD_PREP(DSI_CMD2_BK0_GAMCTRL_VC255_MASK, 0x1f)
},
.nlinv = 7,
};
static int st7701_dsi_probe(struct mipi_dsi_device *dsi)