diff mbox series

[6/6] media: camss: csiphy: Set rate on csiX_phy clock on SDM630/660

Message ID 20201018125237.16717-7-kholk11@gmail.com (mailing list archive)
State Superseded
Headers show
Series Add support for SDM630/660 Camera Subsystem | expand

Commit Message

AngeloGioacchino Del Regno Oct. 18, 2020, 12:52 p.m. UTC
From: AngeloGioacchino Del Regno <kholk11@gmail.com>

The SDM630/660 SoCs (and variants) have another clock source
for the PHY, which must be set to a rate that's equal or
greater than the CSI PHY timer clock: failing to do this
will produce PHY overflows when trying to get a stream from
a very high bandwidth camera sensor and outputting no frame
or a partial one.

Since I haven't found any usecase in which the csiX_phy
clock needs to be higher than the csiXphy_timer, let's just
set the same rate on both, which seems to work just perfect.

Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
---
 .../media/platform/qcom/camss/camss-csiphy.c  | 22 ++++++++++++++++---
 .../media/platform/qcom/camss/camss-csiphy.h  |  1 +
 2 files changed, 20 insertions(+), 3 deletions(-)

Comments

Robert Foss Oct. 20, 2020, 10:35 a.m. UTC | #1
Looks good to me.

Signed-off-by: Robert Foss <robert.foss@linaro.org>

On Sun, 18 Oct 2020 at 14:53, <kholk11@gmail.com> wrote:
>
> From: AngeloGioacchino Del Regno <kholk11@gmail.com>
>
> The SDM630/660 SoCs (and variants) have another clock source
> for the PHY, which must be set to a rate that's equal or
> greater than the CSI PHY timer clock: failing to do this
> will produce PHY overflows when trying to get a stream from
> a very high bandwidth camera sensor and outputting no frame
> or a partial one.
>
> Since I haven't found any usecase in which the csiX_phy
> clock needs to be higher than the csiXphy_timer, let's just
> set the same rate on both, which seems to work just perfect.
>
> Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
> ---
>  .../media/platform/qcom/camss/camss-csiphy.c  | 22 ++++++++++++++++---
>  .../media/platform/qcom/camss/camss-csiphy.h  |  1 +
>  2 files changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
> index c00f25aac21b..a5d717d022a5 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
> @@ -113,9 +113,7 @@ static int csiphy_set_clock_rates(struct csiphy_device *csiphy)
>         for (i = 0; i < csiphy->nclocks; i++) {
>                 struct camss_clock *clock = &csiphy->clock[i];
>
> -               if (!strcmp(clock->name, "csiphy0_timer") ||
> -                   !strcmp(clock->name, "csiphy1_timer") ||
> -                   !strcmp(clock->name, "csiphy2_timer")) {
> +               if (csiphy->rate_set[i]) {
>                         u8 bpp = csiphy_get_bpp(csiphy->formats,
>                                         csiphy->nformats,
>                                         csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
> @@ -611,6 +609,13 @@ int msm_csiphy_subdev_init(struct camss *camss,
>         if (!csiphy->clock)
>                 return -ENOMEM;
>
> +       csiphy->rate_set = devm_kcalloc(dev,
> +                                       csiphy->nclocks,
> +                                       sizeof(*csiphy->rate_set),
> +                                       GFP_KERNEL);
> +       if (!csiphy->rate_set)
> +               return -ENOMEM;
> +
>         for (i = 0; i < csiphy->nclocks; i++) {
>                 struct camss_clock *clock = &csiphy->clock[i];
>
> @@ -638,6 +643,17 @@ int msm_csiphy_subdev_init(struct camss *camss,
>
>                 for (j = 0; j < clock->nfreqs; j++)
>                         clock->freq[j] = res->clock_rate[i][j];
> +
> +               if (!strcmp(clock->name, "csiphy0_timer") ||
> +                   !strcmp(clock->name, "csiphy1_timer") ||
> +                   !strcmp(clock->name, "csiphy2_timer"))
> +                       csiphy->rate_set[i] = true;
> +
> +               if (camss->version == CAMSS_660 &&
> +                   (!strcmp(clock->name, "csi0_phy") ||
> +                    !strcmp(clock->name, "csi1_phy") ||
> +                    !strcmp(clock->name, "csi2_phy")))
> +                       csiphy->rate_set[i] = true;
>         }
>
>         return 0;
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h
> index 376f865ad383..f7967ef836dc 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.h
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.h
> @@ -66,6 +66,7 @@ struct csiphy_device {
>         u32 irq;
>         char irq_name[30];
>         struct camss_clock *clock;
> +       bool *rate_set;
>         int nclocks;
>         u32 timer_clk_rate;
>         struct csiphy_config cfg;
> --
> 2.28.0
>
diff mbox series

Patch

diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
index c00f25aac21b..a5d717d022a5 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
@@ -113,9 +113,7 @@  static int csiphy_set_clock_rates(struct csiphy_device *csiphy)
 	for (i = 0; i < csiphy->nclocks; i++) {
 		struct camss_clock *clock = &csiphy->clock[i];
 
-		if (!strcmp(clock->name, "csiphy0_timer") ||
-		    !strcmp(clock->name, "csiphy1_timer") ||
-		    !strcmp(clock->name, "csiphy2_timer")) {
+		if (csiphy->rate_set[i]) {
 			u8 bpp = csiphy_get_bpp(csiphy->formats,
 					csiphy->nformats,
 					csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
@@ -611,6 +609,13 @@  int msm_csiphy_subdev_init(struct camss *camss,
 	if (!csiphy->clock)
 		return -ENOMEM;
 
+	csiphy->rate_set = devm_kcalloc(dev,
+					csiphy->nclocks,
+					sizeof(*csiphy->rate_set),
+					GFP_KERNEL);
+	if (!csiphy->rate_set)
+		return -ENOMEM;
+
 	for (i = 0; i < csiphy->nclocks; i++) {
 		struct camss_clock *clock = &csiphy->clock[i];
 
@@ -638,6 +643,17 @@  int msm_csiphy_subdev_init(struct camss *camss,
 
 		for (j = 0; j < clock->nfreqs; j++)
 			clock->freq[j] = res->clock_rate[i][j];
+
+		if (!strcmp(clock->name, "csiphy0_timer") ||
+		    !strcmp(clock->name, "csiphy1_timer") ||
+		    !strcmp(clock->name, "csiphy2_timer"))
+			csiphy->rate_set[i] = true;
+
+		if (camss->version == CAMSS_660 &&
+		    (!strcmp(clock->name, "csi0_phy") ||
+		     !strcmp(clock->name, "csi1_phy") ||
+		     !strcmp(clock->name, "csi2_phy")))
+			csiphy->rate_set[i] = true;
 	}
 
 	return 0;
diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h
index 376f865ad383..f7967ef836dc 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.h
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.h
@@ -66,6 +66,7 @@  struct csiphy_device {
 	u32 irq;
 	char irq_name[30];
 	struct camss_clock *clock;
+	bool *rate_set;
 	int nclocks;
 	u32 timer_clk_rate;
 	struct csiphy_config cfg;