mmc: zynq_sdhci: Split set_tapdelay function to in and out

Split arasan_zynqmp_set_tapdelay() to handle input and output tapdelays
separately. This is required to handle zero values for ITAP and OTAP
values. If we dont split, we will have to remove the if() in the
function, which makes ITAP values to be overwritten when OTAP values are
called to set and vice-versa.

Restrict tap_delay value calculated to max allowed 8 bits for ITAP and 6
bits for OTAP for ZynqMP.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
State: pending

diff --git a/board/xilinx/zynqmp/tap_delays.c b/board/xilinx/zynqmp/tap_delays.c
index 1cab25f00a5ce3fce48a57f077fef4373e9e789d..d16bbb8eff9e340f7670f06d71b2d5f8db848557 100644 (file)
--- a/board/xilinx/zynqmp/tap_delays.c
+++ b/board/xilinx/zynqmp/tap_delays.c
@@ -50,48 +50,51 @@ void zynqmp_dll_reset(u8 deviceid)
                zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, 0x0);
 }
 
-void arasan_zynqmp_set_tapdelay(u8 deviceid, u32 itap_delay, u32 otap_delay)
+void arasan_zynqmp_set_in_tapdelay(u8 deviceid, u32 itap_delay)
 {
        if (deviceid == 0) {
-               zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK,
-                                 SD0_DLL_RST);
-               /* Program ITAP */
-               if (itap_delay) {
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK,
-                                         SD0_ITAPCHGWIN);
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYENA_MASK,
-                                         SD0_ITAPDLYENA);
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYSEL_MASK,
-                                         itap_delay);
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK,
-                                         0x0);
-               }
+               zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, SD0_DLL_RST);
 
-               /* Program OTAP */
-               if (otap_delay)
-                       zynqmp_mmio_write(SD_OTAP_DLY, SD0_OTAPDLYSEL_MASK,
-                                         otap_delay);
+               /* Program ITAP delay */
+               zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK,
+                                 SD0_ITAPCHGWIN);
+               zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYENA_MASK,
+                                 SD0_ITAPDLYENA);
+               zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYSEL_MASK, itap_delay);
+               zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK, 0x0);
 
                zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, 0x0);
        } else {
-               zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK,
-                                 SD1_DLL_RST);
-               /* Program ITAP */
-               if (itap_delay) {
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK,
-                                         SD1_ITAPCHGWIN);
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYENA_MASK,
-                                         SD1_ITAPDLYENA);
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYSEL_MASK,
-                                         (itap_delay << 16));
-                       zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK,
-                                         0x0);
-               }
+               zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, SD1_DLL_RST);
+
+               /* Program ITAP delay */
+               zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK,
+                                 SD1_ITAPCHGWIN);
+               zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYENA_MASK,
+                                 SD1_ITAPDLYENA);
+               zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYSEL_MASK,
+                                 (itap_delay << 16));
+               zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK, 0x0);
+
+               zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, 0x0);
+       }
+}
+
+void arasan_zynqmp_set_out_tapdelay(u8 deviceid, u32 otap_delay)
+{
+       if (deviceid == 0) {
+               zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, SD0_DLL_RST);
+
+               /* Program OTAP delay */
+               zynqmp_mmio_write(SD_OTAP_DLY, SD0_OTAPDLYSEL_MASK, otap_delay);
+
+               zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, 0x0);
+       } else {
+               zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, SD1_DLL_RST);
 
-               /* Program OTAP */
-               if (otap_delay)
-                       zynqmp_mmio_write(SD_OTAP_DLY, SD1_OTAPDLYSEL_MASK,
-                                         (otap_delay << 16));
+               /* Program OTAP delay */
+               zynqmp_mmio_write(SD_OTAP_DLY, SD1_OTAPDLYSEL_MASK,
+                                 (otap_delay << 16));
 
                zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, 0x0);
        }

diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c
index 098c0790e51888ee66999baf949fa2f22a6c19b2..6bcdb4779410ae3be38f9dfc8b28f87d89324e18 100644 (file)
--- a/drivers/mmc/zynq_sdhci.c
+++ b/drivers/mmc/zynq_sdhci.c
@@ -226,7 +226,10 @@ static int sdhci_zynqmp_sdcardclk_set_phase(struct sdhci_host *host,
 
        tap_delay = (degrees * tap_max) / 360;
 
-       arasan_zynqmp_set_tapdelay(priv->deviceid, 0, tap_delay);
+       /* Limit output tap_delay value to 6 bits */
+       tap_delay &= SDHCI_ARASAN_OTAPDLY_SEL_MASK;
+
+       arasan_zynqmp_set_out_tapdelay(priv->deviceid, tap_delay);
 
        return 0;
 }
@@ -279,7 +282,10 @@ static int sdhci_zynqmp_sampleclk_set_phase(struct sdhci_host *host,
 
        tap_delay = (degrees * tap_max) / 360;
 
-       arasan_zynqmp_set_tapdelay(priv->deviceid, tap_delay, 0);
+       /* Limit input tap_delay value to 8 bits */
+       tap_delay &= SDHCI_ARASAN_ITAPDLY_SEL_MASK;
+
+       arasan_zynqmp_set_in_tapdelay(priv->deviceid, tap_delay);
 
        return 0;
 }

diff --git a/include/zynqmp_tap_delay.h b/include/zynqmp_tap_delay.h
index 7b713438f75249cfc2402fed650fe655ce7cd6a4..1c1e3e7deedd4abb6feab31fa972fc09c96d638c 100644 (file)
--- a/include/zynqmp_tap_delay.h
+++ b/include/zynqmp_tap_delay.h
@@ -10,11 +10,12 @@
 
 #ifdef CONFIG_ARCH_ZYNQMP
 void zynqmp_dll_reset(u8 deviceid);
-void arasan_zynqmp_set_tapdelay(u8 device_id, u32 itap_delay, u32 otap_delay);
+void arasan_zynqmp_set_in_tapdelay(u8 device_id, u32 itap_delay);
+void arasan_zynqmp_set_out_tapdelay(u8 device_id, u32 otap_delay);
 #else
 inline void zynqmp_dll_reset(u8 deviceid) {}
-inline void arasan_zynqmp_set_tapdelay(u8 device_id, u32 itap_delay,
-                                      u32 otap_delay) {}
+inline void arasan_zynqmp_set_in_tapdelay(u8 device_id, u32 itap_delay) {}
+inline void arasan_zynqmp_set_out_tapdelay(u8 device_id, u32 otap_delay) {}
 #endif
 
 #endif