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Message-ID: <20241219171035.GD3377144@ragnatech.se>
Date: Thu, 19 Dec 2024 18:10:35 +0100
From: Niklas Söderlund <niklas.soderlund@...natech.se>
To: Laurentiu Palcu <laurentiu.palcu@....nxp.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
linux-staging@...ts.linux.dev
Subject: Re: [PATCH 3/3] staging: media: max96712: add some register and
field definitions
Hi Laurentiu,
Thanks for your patch.
On 2024-12-19 17:06:43 +0200, Laurentiu Palcu wrote:
> Most of the registers in the driver, and their values, are hard-coded
> which makes the code rather difficult to read and maintain. Add register
> and field definitions and use them to replace the hard-coded values
> where possible.
>
> This patch does not change the driver functionality or its structure.
>
> Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....nxp.com>
Nice clean up, thanks for this!
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> ---
> drivers/staging/media/max96712/max96712.c | 207 +++++++++++++++++-----
> 1 file changed, 163 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/staging/media/max96712/max96712.c b/drivers/staging/media/max96712/max96712.c
> index 682ebd20851f7..a3e4b51dc5048 100644
> --- a/drivers/staging/media/max96712/max96712.c
> +++ b/drivers/staging/media/max96712/max96712.c
> @@ -16,9 +16,118 @@
> #include <media/v4l2-fwnode.h>
> #include <media/v4l2-subdev.h>
>
> -#define DEBUG_EXTRA_REG 0x09
> -#define DEBUG_EXTRA_PCLK_25MHZ 0x00
> -#define DEBUG_EXTRA_PCLK_75MHZ 0x01
> +/* TOP_CTRL */
> +#define MAX96712_DEBUG_EXTRA_REG 0x0009
> +#define DEBUG_EXTRA_PCLK_25MHZ 0x00
> +#define DEBUG_EXTRA_PCLK_75MHZ 0x01
> +#define MAX96724_TOP_CTRL_PWR1 0x0013
> +#define RESET_ALL BIT(6)
> +
> +/* BACKTOP0 */
> +#define MAX96712_BACKTOP0_12 0x040b
> +#define CSI_OUT_EN BIT(1)
> +#define SOFT_BPP_0_MASK GENMASK(7, 3)
> +#define SOFT_BPP_0_SHIFT 3
> +#define MAX96712_BACKTOP0_22 0x0415
> +#define MAX96712_BACKTOP0_25 0x0418
> +#define PHY_CSI_TX_DPLL_PREDEF_FREQ_MASK GENMASK(4, 0)
> +#define PHY_CSI_TX_DPLL_PREDEF_FREQ_SHIFT 0
> +#define PHY_CSI_TX_DPLL_FB_FRACTION_PREDEF_EN BIT(5)
> +#define OVERRIDE_BPP_VC_DT_0_2 BIT(6)
> +#define OVERRIDE_BPP_VC_DT_1_3 BIT(7)
> +
> +/* MIPI_PHY */
> +#define MAX96712_MIPI_PHY_0 0x08a0
> +#define PHY_4X2 BIT(0)
> +#define PHY_2X4 BIT(2)
> +#define PHY_1X4A_22 BIT(3)
> +#define PHY_1X4B_22 BIT(4)
> +#define FORCE_CLK0_EN BIT(5)
> +#define FORCE_CLK3_EN BIT(6)
> +#define FORCE_CSI_OUT_EN BIT(7)
> +#define MAX96712_MIPI_PHY_2 0x08a2
> +#define T_HS_TRAIL_MASK GENMASK(1, 0)
> +#define T_HS_TRAIL_SHIFT 0
> +#define T_LPX_MASK GENMASK(3, 2)
> +#define T_LPX_SHIFT 2
> +#define PHY_STDBY_N_MASK GENMASK(7, 4)
> +#define PHY_STDBY_N_SHIFT 4
> +#define PHY0_EN BIT(4)
> +#define PHY1_EN BIT(5)
> +#define PHY2_EN BIT(6)
> +#define PHY3_EN BIT(7)
> +#define MAX96712_MIPI_PHY_3 0x08a3
> +#define PHY0_LANE_MAP_MASK GENMASK(3, 0)
> +#define PHY0_LANE_MAP_SHIFT 0
> +#define PHY1_LANE_MAP_MASK GENMASK(7, 4)
> +#define PHY1_LANE_MAP_SHIFT 4
> +#define MAX96712_MIPI_PHY_5 0x08a5
> +#define PHY0_POL_MAP_MASK GENMASK(2, 0)
> +#define PHY0_POL_MAP_SHIFT 0
> +#define PHY1_POL_MAP_MASK GENMASK(5, 3)
> +#define PHY1_POL_MAP_SHIFT 3
> +#define T_CLK_PREP_MASK GENMASK(7, 6)
> +#define T_CLK_PREP_SHIFT 6
> +#define MAX96712_MIPI_PHY_13 0x08ad
> +#define T_T3_PREBEGIN_MASK GENMASK(5, 0)
> +#define T_T3_PREBEGIN_SHIFT 0
> +#define MAX96712_MIPI_PHY_14 0x08ae
> +#define T_T3_PREP_MASK GENMASK(1, 0)
> +#define T_T3_PREP_SHIFT 0
> +#define T_T3_PREP_40NS 0
> +#define T_T3_PREP_55NS 1
> +#define T_T3_PREP_66_7NS 2
> +#define T_T3_PREP_86_7NS 3
> +#define T_T3_POST_MASK GENMASK(6, 2)
> +#define T_T3_POST_SHIFT 2
> +
> +/* MIPI_TX: 0 <= phy < 4 */
> +#define MAX96712_MIPI_TX_10(phy) (0x090a + (phy) * 0x40)
> +#define CSI2_TWAKEUP_H_MASK GENMASK(2, 0)
> +#define CSI2_TWAKEUP_H_SHIFT 0
> +#define CSI2_VCX_EN BIT(4)
> +#define CSI2_CPHY_EN BIT(5)
> +#define CSI2_LANE_CNT_MASK GENMASK(7, 6)
> +#define CSI2_LANE_CNT_SHIFT 6
> +
> +/* VRX_PATGEN */
> +#define MAX96712_VRX_PATGEN_0 0x1050
> +#define VTG_MODE_MASK GENMASK(1, 0)
> +#define VTG_MODE_SHIFT 0
> +#define VTG_MODE_VS_TRACKING 0
> +#define VTG_MODE_VS_TRIGGER 1
> +#define VTG_MODE_AUTO_REPEAT 2
> +#define VTG_MODE_FREE_RUNNING 3
> +#define DE_INV BIT(2)
> +#define HS_INV BIT(3)
> +#define VS_INV BIT(4)
> +#define GEN_DE BIT(5)
> +#define GEN_HS BIT(6)
> +#define GEN_VS BIT(7)
> +#define MAX96712_VRX_PATGEN_1 0x1051
> +#define VS_TRIG BIT(0)
> +#define PATGEN_MODE_MASK GENMASK(5, 4)
> +#define PATGEN_MODE_SHIFT 4
> +#define PATGEN_MODE_CHECKERBOARD (1 << PATGEN_MODE_SHIFT)
> +#define PATGEN_MODE_GRADIENT (2 << PATGEN_MODE_SHIFT)
> +#define GRAD_MODE BIT(7)
> +#define MAX96712_VRX_PATGEN_VS_DLY 0x1052
> +#define MAX96712_VRX_PATGEN_VS_HIGH 0x1055
> +#define MAX96712_VRX_PATGEN_VS_LOW 0x1058
> +#define MAX96712_VRX_PATGEN_V2H 0x105b
> +#define MAX96712_VRX_PATGEN_HS_HIGH 0x105e
> +#define MAX96712_VRX_PATGEN_HS_LOW 0x1060
> +#define MAX96712_VRX_PATGEN_HS_CNT 0x1062
> +#define MAX96712_VRX_PATGEN_V2D 0x1064
> +#define MAX96712_VRX_PATGEN_DE_HIGH 0x1067
> +#define MAX96712_VRX_PATGEN_DE_LOW 0x1069
> +#define MAX96712_VRX_PATGEN_DE_CNT 0x106b
> +#define MAX96712_VRX_PATGEN_GRAD_INCR 0x106d
> +#define MAX96712_VRX_PATGEN_CHKR_COLOR_A 0x106e
> +#define MAX96712_VRX_PATGEN_CHKR_COLOR_B 0x1071
> +#define MAX96712_VRX_PATGEN_CHKR_RPT_A 0x1074
> +#define MAX96712_VRX_PATGEN_CHKR_RPT_B 0x1075
> +#define MAX96712_VRX_PATGEN_CHKR_ALT 0x1076
>
> enum max96712_pattern {
> MAX96712_PATTERN_CHECKERBOARD = 0,
> @@ -97,18 +206,18 @@ static int max96712_write_bulk_value(struct max96712_priv *priv,
>
> static void max96712_reset(struct max96712_priv *priv)
> {
> - max96712_update_bits(priv, 0x13, 0x40, 0x40);
> + max96712_update_bits(priv, MAX96724_TOP_CTRL_PWR1, RESET_ALL, RESET_ALL);
> msleep(20);
> }
>
> static void max96712_mipi_enable(struct max96712_priv *priv, bool enable)
> {
> if (enable) {
> - max96712_update_bits(priv, 0x40b, 0x02, 0x02);
> - max96712_update_bits(priv, 0x8a0, 0x80, 0x80);
> + max96712_update_bits(priv, MAX96712_BACKTOP0_12, CSI_OUT_EN, CSI_OUT_EN);
> + max96712_update_bits(priv, MAX96712_MIPI_PHY_0, FORCE_CSI_OUT_EN, FORCE_CSI_OUT_EN);
> } else {
> - max96712_update_bits(priv, 0x8a0, 0x80, 0x00);
> - max96712_update_bits(priv, 0x40b, 0x02, 0x00);
> + max96712_update_bits(priv, MAX96712_MIPI_PHY_0, FORCE_CSI_OUT_EN, 0x00);
> + max96712_update_bits(priv, MAX96712_BACKTOP0_12, CSI_OUT_EN, 0x00);
> }
> }
>
> @@ -120,39 +229,47 @@ static void max96712_mipi_configure(struct max96712_priv *priv)
> max96712_mipi_enable(priv, false);
>
> /* Select 2x4 mode. */
> - max96712_write(priv, 0x8a0, 0x04);
> + max96712_write(priv, MAX96712_MIPI_PHY_0, PHY_2X4);
>
> /* TODO: Add support for 2-lane and 1-lane configurations. */
> if (priv->cphy) {
> - /* Configure a 3-lane C-PHY using PHY0 and PHY1. */
> - max96712_write(priv, 0x94a, 0xa0);
> + /* Configure a 3-lane C-PHY using PHY1. */
> + max96712_write(priv, MAX96712_MIPI_TX_10(1),
> + (2 << CSI2_LANE_CNT_SHIFT) | CSI2_CPHY_EN);
>
> /* Configure C-PHY timings. */
> - max96712_write(priv, 0x8ad, 0x3f);
> - max96712_write(priv, 0x8ae, 0x7d);
> + max96712_write(priv, MAX96712_MIPI_PHY_13, 0x3f);
> + max96712_write(priv, MAX96712_MIPI_PHY_14,
> + (0x1f << T_T3_POST_SHIFT) | T_T3_PREP_55NS);
> } else {
> - /* Configure a 4-lane D-PHY using PHY0 and PHY1. */
> - max96712_write(priv, 0x94a, 0xc0);
> + /* Configure a 4-lane D-PHY using PHY1. */
> + max96712_write(priv, MAX96712_MIPI_TX_10(1), 3 << CSI2_LANE_CNT_SHIFT);
> }
>
> /* Configure lane mapping for PHY0 and PHY1. */
> /* TODO: Add support for lane swapping. */
> - max96712_write(priv, 0x8a3, 0xe4);
> + max96712_write(priv, MAX96712_MIPI_PHY_3, 0xe4);
>
> /* Configure lane polarity for PHY0 and PHY1. */
> for (i = 0; i < priv->mipi.num_data_lanes + 1; i++)
> if (priv->mipi.lane_polarities[i])
> phy5 |= BIT(i == 0 ? 5 : i < 3 ? i - 1 : i);
> - max96712_write(priv, 0x8a5, phy5);
> + max96712_write(priv, MAX96712_MIPI_PHY_5, phy5);
>
> /* Set link frequency for PHY0 and PHY1. */
> - max96712_update_bits(priv, 0x415, 0x3f,
> - ((priv->info->dpllfreq / 100) & 0x1f) | BIT(5));
> - max96712_update_bits(priv, 0x418, 0x3f,
> - ((priv->info->dpllfreq / 100) & 0x1f) | BIT(5));
> + max96712_update_bits(priv, MAX96712_BACKTOP0_22,
> + PHY_CSI_TX_DPLL_FB_FRACTION_PREDEF_EN |
> + PHY_CSI_TX_DPLL_PREDEF_FREQ_MASK,
> + PHY_CSI_TX_DPLL_FB_FRACTION_PREDEF_EN |
> + ((priv->info->dpllfreq / 100) & 0x1f));
> + max96712_update_bits(priv, MAX96712_BACKTOP0_25,
> + PHY_CSI_TX_DPLL_FB_FRACTION_PREDEF_EN |
> + PHY_CSI_TX_DPLL_PREDEF_FREQ_MASK,
> + PHY_CSI_TX_DPLL_FB_FRACTION_PREDEF_EN |
> + ((priv->info->dpllfreq / 100) & 0x1f));
>
> /* Enable PHY0 and PHY1 */
> - max96712_update_bits(priv, 0x8a2, 0xf0, 0x30);
> + max96712_update_bits(priv, MAX96712_MIPI_PHY_2, PHY_STDBY_N_MASK, PHY0_EN | PHY1_EN);
> }
>
> static void max96712_pattern_enable(struct max96712_priv *priv, bool enable)
> @@ -170,51 +287,53 @@ static void max96712_pattern_enable(struct max96712_priv *priv, bool enable)
> const u32 v_tot = v_active + v_fp + v_sw + v_bp;
>
> if (!enable) {
> - max96712_write(priv, 0x1051, 0x00);
> + max96712_write(priv, MAX96712_VRX_PATGEN_1, 0x00);
> return;
> }
>
> /* Set PCLK to 75MHz if device have DEBUG_EXTRA register. */
> if (priv->info->have_debug_extra)
> - max96712_write(priv, DEBUG_EXTRA_REG, DEBUG_EXTRA_PCLK_75MHZ);
> + max96712_write(priv, MAX96712_DEBUG_EXTRA_REG, DEBUG_EXTRA_PCLK_75MHZ);
>
> /* Configure Video Timing Generator for 1920x1080 @ 30 fps. */
> - max96712_write_bulk_value(priv, 0x1052, 0, 3);
> - max96712_write_bulk_value(priv, 0x1055, v_sw * h_tot, 3);
> - max96712_write_bulk_value(priv, 0x1058,
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_VS_DLY, 0, 3);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_VS_HIGH, v_sw * h_tot, 3);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_VS_LOW,
> (v_active + v_fp + v_bp) * h_tot, 3);
> - max96712_write_bulk_value(priv, 0x105b, 0, 3);
> - max96712_write_bulk_value(priv, 0x105e, h_sw, 2);
> - max96712_write_bulk_value(priv, 0x1060, h_active + h_fp + h_bp, 2);
> - max96712_write_bulk_value(priv, 0x1062, v_tot, 2);
> - max96712_write_bulk_value(priv, 0x1064,
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_V2H, 0, 3);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_HS_HIGH, h_sw, 2);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_HS_LOW, h_active + h_fp + h_bp, 2);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_HS_CNT, v_tot, 2);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_V2D,
> h_tot * (v_sw + v_bp) + (h_sw + h_bp), 3);
> - max96712_write_bulk_value(priv, 0x1067, h_active, 2);
> - max96712_write_bulk_value(priv, 0x1069, h_fp + h_sw + h_bp, 2);
> - max96712_write_bulk_value(priv, 0x106b, v_active, 2);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_DE_HIGH, h_active, 2);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_DE_LOW, h_fp + h_sw + h_bp, 2);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_DE_CNT, v_active, 2);
>
> /* Generate VS, HS and DE in free-running mode. */
> - max96712_write(priv, 0x1050, 0xfb);
> + max96712_write(priv, MAX96712_VRX_PATGEN_0,
> + GEN_VS | GEN_HS | GEN_DE | VS_INV | HS_INV |
> + (VTG_MODE_FREE_RUNNING << VTG_MODE_SHIFT));
>
> /* Configure Video Pattern Generator. */
> if (priv->pattern == MAX96712_PATTERN_CHECKERBOARD) {
> /* Set checkerboard pattern size. */
> - max96712_write(priv, 0x1074, 0x3c);
> - max96712_write(priv, 0x1075, 0x3c);
> - max96712_write(priv, 0x1076, 0x3c);
> + max96712_write(priv, MAX96712_VRX_PATGEN_CHKR_RPT_A, 0x3c);
> + max96712_write(priv, MAX96712_VRX_PATGEN_CHKR_RPT_B, 0x3c);
> + max96712_write(priv, MAX96712_VRX_PATGEN_CHKR_ALT, 0x3c);
>
> /* Set checkerboard pattern colors. */
> - max96712_write_bulk_value(priv, 0x106e, 0xfecc00, 3);
> - max96712_write_bulk_value(priv, 0x1071, 0x006aa7, 3);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_CHKR_COLOR_A, 0xfecc00, 3);
> + max96712_write_bulk_value(priv, MAX96712_VRX_PATGEN_CHKR_COLOR_B, 0x006aa7, 3);
>
> /* Generate checkerboard pattern. */
> - max96712_write(priv, 0x1051, 0x10);
> + max96712_write(priv, MAX96712_VRX_PATGEN_1, PATGEN_MODE_CHECKERBOARD);
> } else {
> /* Set gradient increment. */
> - max96712_write(priv, 0x106d, 0x10);
> + max96712_write(priv, MAX96712_VRX_PATGEN_GRAD_INCR, 0x10);
>
> /* Generate gradient pattern. */
> - max96712_write(priv, 0x1051, 0x20);
> + max96712_write(priv, MAX96712_VRX_PATGEN_1, PATGEN_MODE_GRADIENT);
> }
> }
>
> --
> 2.44.1
>
--
Kind Regards,
Niklas Söderlund
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