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Date: Fri, 14 Jun 2024 06:02:43 +0000
From: "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
To: Sean Anderson <sean.anderson@...ux.dev>, Laurent Pinchart
<laurent.pinchart@...asonboard.com>, "linux-phy@...ts.infradead.org"
<linux-phy@...ts.infradead.org>
CC: Vinod Koul <vkoul@...nel.org>, "linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "Simek, Michal" <michal.simek@....com>,
Kishon Vijay Abraham I <kishon@...nel.org>
Subject: RE: [PATCH v2 2/4] phy: zynqmp: Store instance instead of type
> -----Original Message-----
> From: Sean Anderson <sean.anderson@...ux.dev>
> Sent: Monday, May 6, 2024 10:31 PM
> To: Laurent Pinchart <laurent.pinchart@...asonboard.com>; linux-
> phy@...ts.infradead.org
> Cc: Vinod Koul <vkoul@...nel.org>; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; Michal Simek <michal.simek@....com>;
> Kishon Vijay Abraham I <kishon@...nel.org>; Sean Anderson
> <sean.anderson@...ux.dev>
> Subject: [PATCH v2 2/4] phy: zynqmp: Store instance instead of type
>
> The phy "type" is just the combination of protocol and instance, and is
> never used apart from that. Store the instance directly, instead of
> converting to a type first. No functional change intended.
>
> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
> ---
>
> Changes in v2:
> - Expand the icm_matrix comment
>
> drivers/phy/xilinx/phy-zynqmp.c | 115 +++++++++-----------------------
> 1 file changed, 31 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/phy/xilinx/phy-zynqmp.c b/drivers/phy/xilinx/phy-
> zynqmp.c
> index 5a434382356c..5a8f81bbeb8d 100644
> --- a/drivers/phy/xilinx/phy-zynqmp.c
> +++ b/drivers/phy/xilinx/phy-zynqmp.c
> @@ -147,22 +147,6 @@
> /* Total number of controllers */
> #define CONTROLLERS_PER_LANE 5
>
> -/* Protocol Type parameters */
> -#define XPSGTR_TYPE_USB0 0 /* USB controller 0 */
> -#define XPSGTR_TYPE_USB1 1 /* USB controller 1 */
> -#define XPSGTR_TYPE_SATA_0 2 /* SATA controller lane 0 */
> -#define XPSGTR_TYPE_SATA_1 3 /* SATA controller lane 1 */
> -#define XPSGTR_TYPE_PCIE_0 4 /* PCIe controller lane 0 */
> -#define XPSGTR_TYPE_PCIE_1 5 /* PCIe controller lane 1 */
> -#define XPSGTR_TYPE_PCIE_2 6 /* PCIe controller lane 2 */
> -#define XPSGTR_TYPE_PCIE_3 7 /* PCIe controller lane 3 */
> -#define XPSGTR_TYPE_DP_0 8 /* Display Port controller lane 0 */
> -#define XPSGTR_TYPE_DP_1 9 /* Display Port controller lane 1 */
> -#define XPSGTR_TYPE_SGMII0 10 /* Ethernet SGMII controller 0 */
> -#define XPSGTR_TYPE_SGMII1 11 /* Ethernet SGMII controller 1 */
> -#define XPSGTR_TYPE_SGMII2 12 /* Ethernet SGMII controller 2 */
> -#define XPSGTR_TYPE_SGMII3 13 /* Ethernet SGMII controller 3 */
> -
> /* Timeout values */
> #define TIMEOUT_US 1000
>
> @@ -185,7 +169,8 @@ struct xpsgtr_ssc {
> /**
> * struct xpsgtr_phy - representation of a lane
> * @phy: pointer to the kernel PHY device
> - * @type: controller which uses this lane
> + * @instance: instance of the protocol type (such as the lane within a
> + * protocol, or the USB/Ethernet controller)
> * @lane: lane number
> * @protocol: protocol in which the lane operates
> * @skip_phy_init: skip phy_init() if true
> @@ -194,7 +179,7 @@ struct xpsgtr_ssc {
> */
> struct xpsgtr_phy {
> struct phy *phy;
> - u8 type;
> + u8 instance;
> u8 lane;
> u8 protocol;
> bool skip_phy_init;
> @@ -331,8 +316,8 @@ static int xpsgtr_wait_pll_lock(struct phy *phy)
>
> if (ret == -ETIMEDOUT)
> dev_err(gtr_dev->dev,
> - "lane %u (type %u, protocol %u): PLL lock timeout\n",
> - gtr_phy->lane, gtr_phy->type, gtr_phy->protocol);
> + "lane %u (protocol %u, instance %u): PLL lock
> timeout\n",
> + gtr_phy->lane, gtr_phy->protocol, gtr_phy-
> >instance);
>
> return ret;
> }
> @@ -647,8 +632,7 @@ static int xpsgtr_phy_power_on(struct phy *phy)
> * cumulating waits for both lanes. The user is expected to initialize
> * lane 0 last.
> */
> - if (gtr_phy->protocol != ICM_PROTOCOL_DP ||
> - gtr_phy->type == XPSGTR_TYPE_DP_0)
> + if (gtr_phy->protocol != ICM_PROTOCOL_DP || !gtr_phy->instance)
> ret = xpsgtr_wait_pll_lock(phy);
>
> return ret;
> @@ -678,73 +662,33 @@ static const struct phy_ops xpsgtr_phyops = {
> * OF Xlate Support
> */
>
> -/* Set the lane type and protocol based on the PHY type and instance
> number. */
> +/* Set the lane protocol and instance based on the PHY type and instance
> number. */
> static int xpsgtr_set_lane_type(struct xpsgtr_phy *gtr_phy, u8 phy_type,
> unsigned int phy_instance)
> {
> unsigned int num_phy_types;
> - const int *phy_types;
>
> switch (phy_type) {
> - case PHY_TYPE_SATA: {
> - static const int types[] = {
> - XPSGTR_TYPE_SATA_0,
> - XPSGTR_TYPE_SATA_1,
> - };
> -
> - phy_types = types;
> - num_phy_types = ARRAY_SIZE(types);
> + case PHY_TYPE_SATA:
> + num_phy_types = 2;
> gtr_phy->protocol = ICM_PROTOCOL_SATA;
> break;
> - }
> - case PHY_TYPE_USB3: {
> - static const int types[] = {
> - XPSGTR_TYPE_USB0,
> - XPSGTR_TYPE_USB1,
> - };
> -
> - phy_types = types;
> - num_phy_types = ARRAY_SIZE(types);
> + case PHY_TYPE_USB3:
> + num_phy_types = 2;
> gtr_phy->protocol = ICM_PROTOCOL_USB;
> break;
> - }
> - case PHY_TYPE_DP: {
> - static const int types[] = {
> - XPSGTR_TYPE_DP_0,
> - XPSGTR_TYPE_DP_1,
> - };
> -
> - phy_types = types;
> - num_phy_types = ARRAY_SIZE(types);
> + case PHY_TYPE_DP:
> + num_phy_types = 2;
> gtr_phy->protocol = ICM_PROTOCOL_DP;
> break;
> - }
> - case PHY_TYPE_PCIE: {
> - static const int types[] = {
> - XPSGTR_TYPE_PCIE_0,
> - XPSGTR_TYPE_PCIE_1,
> - XPSGTR_TYPE_PCIE_2,
> - XPSGTR_TYPE_PCIE_3,
> - };
> -
> - phy_types = types;
> - num_phy_types = ARRAY_SIZE(types);
> + case PHY_TYPE_PCIE:
> + num_phy_types = 4;
> gtr_phy->protocol = ICM_PROTOCOL_PCIE;
> break;
> - }
> - case PHY_TYPE_SGMII: {
> - static const int types[] = {
> - XPSGTR_TYPE_SGMII0,
> - XPSGTR_TYPE_SGMII1,
> - XPSGTR_TYPE_SGMII2,
> - XPSGTR_TYPE_SGMII3,
> - };
> -
> - phy_types = types;
> - num_phy_types = ARRAY_SIZE(types);
> + case PHY_TYPE_SGMII:
> + num_phy_types = 4;
> gtr_phy->protocol = ICM_PROTOCOL_SGMII;
> break;
> - }
> default:
> return -EINVAL;
> }
> @@ -752,22 +696,25 @@ static int xpsgtr_set_lane_type(struct xpsgtr_phy
> *gtr_phy, u8 phy_type,
> if (phy_instance >= num_phy_types)
> return -EINVAL;
>
> - gtr_phy->type = phy_types[phy_instance];
> + gtr_phy->instance = phy_instance;
> return 0;
> }
>
> /*
> - * Valid combinations of controllers and lanes (Interconnect Matrix).
> + * Valid combinations of controllers and lanes (Interconnect Matrix). Each
> + * "instance" represents one controller for a lane. For PCIe and DP, the
> + * "instance" is the logical lane in the link. For SATA, USB, and SGMII,
> + * the instance is the index of the controller.
> + *
> + * This information is only used to validate the devicetree reference, and is
> + * not used when programming the hardware.
> */
> static const unsigned int
> icm_matrix[NUM_LANES][CONTROLLERS_PER_LANE] = {
> - { XPSGTR_TYPE_PCIE_0, XPSGTR_TYPE_SATA_0, XPSGTR_TYPE_USB0,
> - XPSGTR_TYPE_DP_1, XPSGTR_TYPE_SGMII0 },
> - { XPSGTR_TYPE_PCIE_1, XPSGTR_TYPE_SATA_1, XPSGTR_TYPE_USB0,
> - XPSGTR_TYPE_DP_0, XPSGTR_TYPE_SGMII1 },
> - { XPSGTR_TYPE_PCIE_2, XPSGTR_TYPE_SATA_0, XPSGTR_TYPE_USB0,
> - XPSGTR_TYPE_DP_1, XPSGTR_TYPE_SGMII2 },
> - { XPSGTR_TYPE_PCIE_3, XPSGTR_TYPE_SATA_1, XPSGTR_TYPE_USB1,
> - XPSGTR_TYPE_DP_0, XPSGTR_TYPE_SGMII3 }
> + /* PCIe, SATA, USB, DP, SGMII */
> + { 0, 0, 0, 1, 0 }, /* Lane 0 */
> + { 1, 1, 0, 0, 1 }, /* Lane 1 */
> + { 2, 0, 0, 1, 2 }, /* Lane 2 */
> + { 3, 1, 1, 0, 3 }, /* Lane 3 */
> };
Feel this change reduces readability and introduce magic values
for icm_matrix and num_phy_types. At times decoding these
numbers can be hard.
Can we retain deriving num_phy_types from ARRAY_SIZE(types);
and also defines for ICM matrix?
>
> /* Translate OF phandle and args to PHY instance. */
> @@ -822,7 +769,7 @@ static struct phy *xpsgtr_xlate(struct device *dev,
> * is allowed to operate on the lane.
> */
> for (i = 0; i < CONTROLLERS_PER_LANE; i++) {
> - if (icm_matrix[phy_lane][i] == gtr_phy->type)
> + if (icm_matrix[phy_lane][i] == gtr_phy->instance)
> return gtr_phy->phy;
> }
>
> --
> 2.35.1.1320.gc452695387.dirty
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