soc/amd/picasso: Use pcie_gpp_dxio_update_clk_req_config

This function turns off gpp_clk for the devices which are disabled, and
adds the code to fix up the clock configuration depending on dxio
descriptors. Also this brings picasso in line with cezanne, mendocino
and phoenix. This also prepares picasso to use the common function
gpp_clk_setup_common.

Change-Id: Ice2e3a5a78359da9a438434c7d4aa1eca878d396
Signed-off-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80413
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

src/soc/amd/picasso/Kconfig

@@ -66,6 +66,7 @@ config SOC_AMD_PICASSO
 	select SOC_AMD_COMMON_BLOCK_UART
 	select SOC_AMD_COMMON_BLOCK_UCODE
 	select SOC_AMD_COMMON_FSP_DMI_TABLES
+	select SOC_AMD_COMMON_FSP_PCIE_CLK_REQ
 	select SOC_AMD_SUPPORTS_WARM_RESET
 	select SSE2
 	select UDK_2017_BINDING

src/soc/amd/picasso/chip.h

@@ -4,6 +4,7 @@
 #define __PICASSO_CHIP_H__
 
 #include <amdblocks/chip.h>
+#include <amdblocks/pci_clk_req.h>
 #include <commonlib/helpers.h>
 #include <drivers/i2c/designware/dw_i2c.h>
 #include <gpio.h>
@@ -258,11 +259,7 @@ struct soc_amd_picasso_config {
 
 	/* The array index is the general purpose PCIe clock output number. Values in here
 	   aren't the values written to the register to have the default to be always on. */
-	enum {
-		GPP_CLK_ON,	/* GPP clock always on; default */
-		GPP_CLK_REQ,	/* GPP clock controlled by corresponding #CLK_REQx pin */
-		GPP_CLK_OFF,	/* GPP clk off */
-	} gpp_clk_config[GPP_CLK_OUTPUT_COUNT];
+	enum gpp_clk_req gpp_clk_config[GPP_CLK_OUTPUT_COUNT];
 
 	/* performance policy for the PCIe links: power consumption vs. link speed */
 	enum {

src/soc/amd/picasso/fch.c

@@ -7,6 +7,7 @@
 #include <device/pci.h>
 #include <device/pci_ops.h>
 #include <amdblocks/amd_pci_util.h>
+#include <amdblocks/pci_clk_req.h>
 #include <amdblocks/reset.h>
 #include <amdblocks/acpimmio.h>
 #include <amdblocks/acpi.h>
@@ -174,7 +175,7 @@ static void al2ahb_clock_gate(void)
 /* configure the general purpose PCIe clock outputs according to the devicetree settings */
 static void gpp_clk_setup(void)
 {
-	const struct soc_amd_picasso_config *cfg = config_of_soc();
+	struct soc_amd_picasso_config *cfg = config_of_soc();
 
 	/* look-up table to be able to iterate over the PCIe clock output settings */
 	const uint8_t gpp_clk_shift_lut[GPP_CLK_OUTPUT_COUNT] = {
@@ -189,6 +190,8 @@ static void gpp_clk_setup(void)
 
 	uint32_t gpp_clk_ctl = misc_read32(GPP_CLK_CNTRL);
 
+	pcie_gpp_dxio_update_clk_req_config(&cfg->gpp_clk_config[0],
+					    ARRAY_SIZE(cfg->gpp_clk_config));
 	for (int i = 0; i < GPP_CLK_OUTPUT_COUNT; i++) {
 		gpp_clk_ctl &= ~GPP_CLK_REQ_MASK(gpp_clk_shift_lut[i]);
 		/*